CN114858545B - Sample preparation method and device for simulating deep in-situ ground stress and application method of sample preparation method and device - Google Patents
Sample preparation method and device for simulating deep in-situ ground stress and application method of sample preparation method and device Download PDFInfo
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- 238000011065 in-situ storage Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005464 sample preparation method Methods 0.000 title claims abstract description 10
- 239000011435 rock Substances 0.000 claims abstract description 78
- 239000002002 slurry Substances 0.000 claims abstract description 65
- 239000000463 material Substances 0.000 claims abstract description 58
- 238000012360 testing method Methods 0.000 claims abstract description 27
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000002360 preparation method Methods 0.000 claims description 12
- 238000002441 X-ray diffraction Methods 0.000 claims description 11
- 238000012806 monitoring device Methods 0.000 claims description 11
- 238000011160 research Methods 0.000 claims description 10
- 238000012669 compression test Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000004088 simulation Methods 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 8
- 239000011707 mineral Substances 0.000 description 8
- 239000013078 crystal Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000006004 Quartz sand Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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Abstract
The application relates to a sample preparation method and device for simulating deep in-situ stress and a using method thereof, comprising the following steps: preparing a simulated sample, and testing the elastic modulus, poisson ratio, compressive strength, tensile strength, internal friction angle, cohesive force and internal stress value of the sample; preparing aggregate according to a certain grading, and mixing the aggregate with the slurry; introducing the mixed aggregate and slurry into a container, and applying force to compress the mixed aggregate and slurry; curing the compressed aggregate and slurry, and taking out the mixture after curing for a period of time to obtain a rock-like material; when the mechanical property, deformation characteristic and internal stress value of the prepared rock-like material are similar to those of the target rock, a sample simulating deep in-situ stress is obtained. According to the application, the rock in-situ internal stress characteristics are considered, so that the prepared rock-like material is more similar to the mechanical property and deformation characteristic of deep in-situ real rock, the beginning test of stratum deep rock can be replaced, the energy consumption and the cost are reduced, and the accuracy of data is provided.
Description
Technical Field
The invention relates to the technical field of rock mechanics experiments, in particular to a sample preparation method and device for simulating deep in-situ ground stress and a use method thereof.
Background
In the rock engineering construction in recent years, along with the continuous increase of the excavation depth, the core is directly cored on site with great difficulty, and the collected rock sample is changed in property due to leaving the in-situ environment. Therefore, in reality, the simulation by adopting the similar model is more and more favored, and meanwhile, the mechanical test research of the rock is facilitated.
At present, when the rock-like material is prepared, only basic mechanical properties such as elastic modulus, peak strength and the like and deformation characteristics of the real rock are often considered, the internal stress characteristics of the rock under the action of ground stress are often not considered, so that the prepared rock-like material lacks key mechanical properties, and the mechanical test carried out by means of the rock-like material cannot reflect the mechanical behavior of the real rock.
Disclosure of Invention
The application provides a sample preparation method and device for simulating deep in-situ ground stress and a using method thereof for solving the technical problems.
The application is realized by the following technical scheme:
the sample preparation method for simulating deep in-situ stress comprises the following steps:
obtaining the elastic modulus, poisson ratio, compressive strength, tensile strength, internal friction angle, cohesive force and internal stress value of the target rock;
preparing a rock-like material comprising: preparing lithofacies slices from stratum rocks in a research area, acquiring rock particle size distribution by a binarization method, preparing aggregate according to a certain grading formulation, and mixing the aggregate with slurry; introducing the mixed aggregate and slurry into a container, and applying force to the mixed aggregate and slurry to compress the mixed aggregate and slurry; curing the compressed aggregate and slurry, and taking out the mixture after curing for a period of time to obtain a rock-like material;
Obtaining the elastic modulus, poisson ratio, compressive strength, tensile strength, internal friction angle and cohesive force of the rock-like material, and comparing the elastic modulus, poisson ratio, compressive strength, tensile strength, internal friction angle and cohesive force with indexes of target rock; when the absolute value of the difference between the six indexes and the target rock index does not exceed a preset value, the mechanical property and the deformation characteristic of the prepared rock-like material are similar to those of the target rock; if the absolute value of the difference between the six indexes and the target rock index is larger than a preset value, changing the ratio of each component of the mixture, and preparing the rock-like material again until the absolute value of the difference between the six indexes of the rock-like material and the target rock is not larger than the preset value;
Calculating the internal stress value of the prepared rock-like material, and comparing the internal stress value with the internal stress value of the target rock; when the absolute value of the difference between the internal stress values of the two materials does not exceed a preset value, the internal stress value of the prepared rock-like material is similar to that of the target rock; if the absolute value of the difference between the internal stress values is larger than a preset value, preparing the rock-like material again; if the difference between the internal stress values of the rock-like material and the target rock is larger than a preset value, reducing the applied force in the process of preparing the rock-like material; if the difference between the internal stress values of the rock-like material and the target rock is smaller than a negative preset value, increasing the applied force in the process of preparing the rock-like material; until the absolute value of the difference between the internal stress values does not exceed a preset value;
and when the mechanical property, deformation characteristic and internal stress value of the prepared rock-like material are similar to those of the target rock, obtaining an in-situ internal stress sample.
It should be noted that the preset value is set according to needs.
The elastic modulus, the poisson ratio, the compressive strength, the tensile strength, the internal friction angle and the cohesive force can be obtained through a single-triaxial compression test and a Brazilian split test; internal stress values were calculated by X-ray diffraction experiments.
Optionally, a sample preparation device simulating deep in-situ stress is adopted in the preparation of the rock-like material, and the device comprises a high-rigidity container, a pressure plate, a pressure rod and a pressure monitoring device, wherein the high-rigidity container is provided with a slurry inlet and a slurry outlet, the slurry outlet is higher than the slurry inlet, and the pressure plate is arranged in the high-rigidity container and is used for pressing aggregate from top to bottom;
When the rock-like material is prepared, the mixed aggregate and slurry are led into a high-rigidity container from a slurry inlet, the slurry inlet and the slurry outlet are plugged when the mixed aggregate and slurry stably flow out from the slurry outlet, then a force is applied to a pressure plate through a pressure rod, and the applied pressure is monitored through a pressure monitoring device between the pressure rod and the pressure plate; when the pressure reaches the target value, the pressure value is stabilized, the pressure plate is not lowered any more, and subsequent maintenance is performed.
Compared with the prior art, the application has the following beneficial effects:
According to the application, the rock in-situ internal stress characteristics are considered, so that the prepared rock-like material is more similar to the mechanical property and deformation characteristic of deep in-situ real rock, the beginning test of stratum deep rock can be replaced, the energy consumption and the cost are reduced, and the accuracy of data is provided.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application.
FIG. 1 is a flow chart of a sample prepared to simulate deep in situ stress in an embodiment;
FIG. 2 is a graph of diffraction angle relationships in an embodiment;
FIG. 3 is an elevation view of a sample preparation device simulating deep in situ stresses in an embodiment;
FIG. 4 is a right side view of a sample preparation device simulating deep in situ stresses in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments. It will be apparent that the described embodiments are some, but not all, of the embodiments of the application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision. It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or directions or positional relationships conventionally put in place when the inventive product is used, or directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
As shown in fig. 1, the sample preparation method for simulating deep in-situ stress disclosed in this embodiment includes the following steps:
S1, obtaining the elastic modulus, poisson' S ratio, compressive strength, tensile strength, internal friction angle, cohesive force and internal stress value of the target rock.
The elastic modulus, poisson ratio, compressive strength, tensile strength, internal friction angle and cohesion are obtained through single and triaxial compression tests and brazilian split tests, which are conventional techniques in the art and will not be described herein.
Numerical value of internal stress of rock the calculation may be performed using existing methods. The application discloses another method for calculating the internal stress value of rock, which specifically comprises the following steps:
preparing a core: selecting stratum of a research area, taking out a core along the bedding direction, processing the core into a sample matched with the shape, the size and the thickness of a sample table of an X-ray diffractometer, further polishing the surface to be detected, flattening the plane of the surface to be detected, and eliminating a surface strain layer.
Placing a sample at a sample stage of an X-ray diffractometer, and performing step-and-scan operation in a theta-theta scanning mode, wherein the sampling step length is 0.005-0.01 DEG, and the residence time of each step is as follows: 0.1-0.3s, diffraction angle is 10-158 degrees; and (3) importing the detection result into Jade software to obtain a diffraction pattern of the target rock, selecting a diffraction peak with obvious peak shape as a diffraction characteristic peak, taking the diffraction pattern within a diffraction angle range of 5-10 degrees with the diffraction characteristic peak as a center as an important research object, determining a mineral component represented by the diffraction peak through a mineral PDF card, and verifying the accuracy of the diffraction pattern by combining a lithology sheet of the target rock, wherein the diffraction angle corresponding to the characteristic peak is theta 0. The lithology sheet can acquire the mineral composition of the rock and can verify the accuracy of the diffraction pattern. When the minerals displayed by the lithology sheets do not appear in the diffraction pattern, the X-ray diffraction test is carried out again until the minerals displayed by the lithology sheets appear in the diffraction pattern, which indicates that errors can occur in the X-ray diffraction test.
The sample plate is moved to change the incidence angle of X rays, an X-ray diffraction test of different incidence angles is carried out by taking 4-5 degrees as an equidistant, X-ray diffraction patterns of the rock under different incidence angles are obtained, diffraction patterns in a specific diffraction angle range are selected for comparison, diffraction angles theta i (i=1, 2,3 …) corresponding to diffraction peaks of different incidence angles are obtained, and according to the diffraction measurement angle relation, the relation of an included angle phi between the normal line of a crystal face and the normal line of the surface of a test piece, an included angle alpha between the incident ray and the surface of the test piece and an included angle theta between the incident ray and the crystal face is determined, wherein each angle relation is shown in figure 2, and each included angle relation is:
The values of phi i (i=0, 1,2,3 …) of the rock characteristic peaks at different incidence angles are obtained through calculation of the above formula, and the values of sin 2ψi (i=0, 1,2,3 …) are further calculated. And (3) taking 2 theta as a y axis, sin 2 psi as an x axis, and performing linear fitting in an origin to obtain a linear fitting curve slope M.
According to the elastic modulus E and Poisson's ratio mu of the mineral corresponding to the characteristic peak, the internal stress coefficient K is calculated according to the following formula:
Wherein K is an internal stress coefficient, E is an elastic modulus of a mineral crystal face, and mu is a Poisson's ratio of the mineral crystal face; and theta 0 is a diffraction angle in the absence of stress, and theta 0 is a diffraction angle corresponding to a diffraction characteristic peak of the X-ray diffractometer in a theta-theta scanning mode.
Finally, the rock internal stress value σ int is calculated using the following formula:
σint＝KM
In the above formula, K is an internal stress coefficient K, and M is the slope of a linear fitting curve.
The internal stress numerical calculation of the rock-like material in step S2 may also be calculated by the above method.
S2, preparing rock-like materials: preparing lithofacies slices from stratum rocks in a research area, obtaining rock particle size distribution through a binarization method, preparing aggregate according to a certain grading, taking quartz sand as a main component of the aggregate, and mixing the prepared aggregate with slurry; and then introducing the mixed aggregate and slurry into a container, and applying force to the mixed aggregate and slurry to compress the mixed aggregate and slurry. The applied force is monitored in the force application process, the force can be adjusted to a target value in real time, and when the pressure reaches the target value of the applied force, the holding force is constant; and finally, curing the mixture of the aggregate and the slurry, and taking out the mixture after curing for a period of time to obtain the rock-like material.
In some embodiments, the slurry is prepared from cement, gypsum, and water in a certain proportion. With reference to the existing research results, the ratio close to the six indexes of the elastic modulus, poisson ratio, compressive strength, tensile strength, internal friction angle and cohesive force of the target rock is determined as the calibration ratio of the test.
In some embodiments, the maintenance time is 28 days.
In some embodiments, the force application target value may be set to the rock internal stress value first when the aggregate is applied with force.
S3, processing the mixture prepared in the step S2 into a standard cylinder sample with the diameter of 50mm multiplied by 100mm, carrying out a single-triaxial compression test and a Brazilian split test, obtaining six indexes of the rock-like material, namely the elastic modulus, the Poisson ratio, the compressive strength, the tensile strength, the internal friction angle and the cohesive force, and comparing the six indexes with the corresponding indexes of the target rock. When the difference between the 6 indexes and the corresponding indexes of the target rock is within 5%, the mechanical properties of the prepared rock-like material are determined to be similar to those of the target rock. When each index is different from the target rock by more than 5%, quantitatively changing the ratio of each component of the mixture by using a controlled variable method, determining the rest of test proportion, then adopting an orthogonal test principle, processing the mixture configured and maintained under each test proportion into a standard cylinder sample with the diameter of 50mm multiplied by 100mm, carrying out a single-triaxial compression test and a Brazilian split test, obtaining the elastic modulus, poisson ratio, compressive strength, tensile strength, internal friction angle and cohesive force of the rock-like material, comparing the six indexes with the corresponding indexes of the target rock, adjusting the test proportion by using a range analysis means until the absolute value of the difference between each index of the rock-like material and the corresponding index of the target rock is within 5%, and determining that the mechanical property and deformation characteristic of the prepared rock-like material are similar to those of the target rock.
And (3) carrying out an X-ray diffraction test on the rock-like material, calculating the internal stress value of the rock-like material, and comparing the internal stress value with the target rock. When the absolute value of the difference between the internal stress values is within 5%, the internal stress value of the developed rock-like material is determined to be similar to that of the target rock. When the difference between the internal stress value and the target rock pressure value is more than 5%, the applied force needs to be reduced, when the internal stress value and the target rock pressure value are less than minus 5%, the applied force needs to be increased, then the preparation of the internal stress rock material and the X-ray diffraction test are carried out until the internal stress value is within 5%, and the reasonable value of the applied pressure can be determined and recorded.
Thus, a sample simulating deep in-situ stress was prepared.
It should be noted that the proportion of 5% may be reasonably reduced or increased as required, and is not limited only.
It should be noted that the number of samples for uniaxial compression test, triaxial compression test, brazilian split test, X-ray diffraction test is preferably more than two, and then the average is calculated and compared with the target rock. In some embodiments, the number of samples for the uniaxial compression test, the triaxial compression test, the brazilian split test, and the X-ray diffraction test are all three.
Example two
To facilitate the preparation of a sample simulating deep in-situ stress, this embodiment discloses a sample preparation device simulating deep in-situ stress, which comprises a high stiffness vessel 1, a pressure plate 2, a pressure rod 3 and a pressure monitoring device 4, as shown in fig. 3 and 4, wherein the high stiffness vessel 1 is provided with a slurry inlet 11 and a slurry outlet 12. The slurry outlet 12 is higher than the slurry inlet 11. Optionally, the slurry outlet 12 is located on the opposite side of the high stiffness vessel 1 from the slurry inlet 11. A pressure plate 2 is placed in the high rigidity container 1 for pressing the aggregate. Generally the outer edge of the pressure plate 2 is of a conforming design to the inner wall of the high stiffness container 1.
The lower end of the pressure rod 3 extends into the high-rigidity container 1, and the pressure rod 3 is used for applying force to the pressure plate 2 from top to bottom, so that the aggregate is indirectly applied with force.
The pressure monitoring device 4 is arranged between the lower end of the pressure rod 3 and the pressure plate 2 and is used for monitoring pressure, and the pressure monitoring device 4 is connected with a data wire 41 for transmitting data.
In some embodiments, the pressure monitoring device 4 is a pressure sensor, a fiber optic sensor, or a pressure cell.
The using method of the sample preparation device simulating deep in-situ stress comprises the following steps:
Rock phase slices are prepared from stratum rock in a research area, rock particle size distribution is obtained through a binarization method, aggregate is prepared according to a certain grading, the aggregate is mainly quartz sand, mixed fluid 5 is obtained after the prepared aggregate and slurry are mixed, the mixed fluid 5 is introduced into a high-rigidity container 1 through a slurry inlet 11, and when the mixed fluid 5 stably flows out from a slurry outlet 12, the slurry inlet 11 and the slurry outlet 12 are blocked.
The force is then applied to the pressure plate 2 by the pressure rod 3, the magnitude of which can be monitored by a pressure sensor or pressure cell between the pressure rod 3 and the pressure plate 2 and transmitted via a data line 41, and can be adjusted in real time to a selected target value.
When the pressure reaches the target value, the stable pressure value to the value shows stability and the pressure plate 2 is not lowered any more; curing the aggregate and the slurry for 28 days, and taking out the mixture to obtain the rock-like material.
Wherein, when the mixed fluid 5 flows out at a continuous, constant and moderate rate, the mixed fluid 5 can be stably discharged by visual observation. Medium means that the mixed fluid 5 does not blow out rapidly or does not flow out in small trickles.
It is worth noting that the pressure value does not exceed the strength that can be tolerated by the high stiffness container 1.
When the difference between the internal stress value and the target rock pressure value is more than 5% compared with the prepared rock-like material and the target rock, the force applied by the pressure rod 3 to the pressure plate 2 needs to be reduced; when the difference between the internal stress value and the pressure value of the target rock is less than minus 5%, the force applied by the pressure rod 3 to the pressure plate 2 is required to be increased, so that the internal stress rock material preparation and the X-ray diffraction test are carried out until the internal stress value is within 5%, the reasonable value of the pressure applied by the pressure rod 3 can be determined and recorded.
In some embodiments, the method further comprises the step of verifying the feasibility of the apparatus for preparing the rock-like material.
The foregoing detailed description of the application has been presented for purposes of illustration and description, and it should be understood that the application is not limited to the particular embodiments disclosed, but is intended to cover all modifications, equivalents, alternatives, and improvements within the spirit and principles of the application.
Claims (8)
1. The sample preparation method for simulating deep in-situ stress is characterized by comprising the following steps of: the method comprises the following steps:
obtaining the elastic modulus, poisson ratio, compressive strength, tensile strength, internal friction angle, cohesive force and internal stress value of the target rock;
Preparing a rock-like material comprising: preparing lithofacies slices from stratum rocks in a research area, acquiring rock particle size distribution, preparing aggregate according to a certain grading, and mixing the aggregate with slurry; introducing the mixed aggregate and slurry into a container, and applying force to the mixed aggregate and slurry to compress the mixed aggregate and slurry; curing the compressed aggregate and slurry, and taking out the mixture after curing for a period of time to obtain a rock-like material;
Obtaining the elastic modulus, poisson ratio, compressive strength, tensile strength, internal friction angle and cohesive force of the rock-like material, and comparing the elastic modulus, poisson ratio, compressive strength, tensile strength, internal friction angle and cohesive force with indexes of target rock; when the absolute value of the difference between the six indexes and the target rock index does not exceed a preset value, the mechanical property and the deformation characteristic of the prepared rock-like material are similar to those of the target rock; if the absolute value of the difference between the six indexes and the corresponding indexes of the target rock is larger than a preset value, changing the ratio of each component of the mixture, and preparing the rock-like material again until the absolute value of the difference between the six indexes of the rock-like material and the corresponding indexes of the target rock does not exceed the preset value;
Calculating the internal stress value of the prepared rock-like material, and comparing the internal stress value with the internal stress value of the target rock; when the absolute value of the difference between the internal stress values of the two materials does not exceed a preset value, the internal stress value of the prepared rock-like material is similar to the internal stress value of the target rock; if the absolute value of the difference between the internal stress values is larger than a preset value, preparing the rock-like material again; if the difference between the internal stress values of the rock-like material and the target rock is larger than a preset value, reducing the applied force in the process of preparing the rock-like material; if the difference between the internal stress values of the rock-like material and the target rock is smaller than a negative preset value, increasing the applied force in the process of preparing the rock-like material; until the absolute value of the difference between the internal stress values does not exceed a preset value;
When the mechanical property, deformation characteristic and internal stress value of the prepared rock-like material are similar to those of the target rock, a sample simulating deep in-situ stress is obtained;
the device for preparing the rock-like material comprises a high-rigidity container, a pressure plate, a pressure rod and a pressure monitoring device, wherein the high-rigidity container is provided with a slurry inlet and a slurry outlet, the slurry outlet is higher than the slurry inlet, and the pressure plate is arranged in the high-rigidity container and is used for pressing aggregate from top to bottom;
When the rock-like material is prepared, the mixed aggregate and slurry are led into a high-rigidity container from a slurry inlet, the slurry inlet and the slurry outlet are plugged when the mixed aggregate and slurry stably flow out from the slurry outlet, then a force is applied to a pressure plate through a pressure rod, and the applied pressure is monitored through a pressure monitoring device between the pressure rod and the pressure plate; when the pressure reaches the target value, the pressure value is stabilized and the pressure plate is no longer lowered, and subsequent curing is performed.
2. The method for preparing a sample simulating deep in-situ stresses according to claim 1, wherein: the preset value is 5% of the target rock value.
3. The method for preparing a sample simulating deep in-situ stress according to claim 1 or 2, wherein: and obtaining the rock particle size distribution by a binarization method.
4. The method for preparing a sample simulating deep in-situ stress according to claim 1 or 2, wherein: the elastic modulus, poisson ratio, compressive strength, tensile strength, internal friction angle and cohesive force are obtained through a single-triaxial compression test and a Brazilian split test.
5. The method for preparing a sample simulating deep in-situ stresses according to claim 1, wherein: internal stress values were calculated by X-ray diffraction experiments.
6. The method for preparing a sample simulating deep in-situ stresses according to claim 1 or 5, wherein: the first pressure target value for applying force to the mixed aggregate and slurry is set as the internal stress value of the stratum rock of the research area.
7. The sample preparation device of simulation deep normal position ground stress, its characterized in that: the device comprises a high-rigidity container, a pressure plate, a pressure rod and a pressure monitoring device, wherein the high-rigidity container is provided with a slurry inlet and a slurry outlet, and the slurry outlet is higher than the slurry inlet;
The pressure plate is arranged in the high-rigidity container and used for pressing aggregate, the lower end of the pressure rod extends into the high-rigidity container, and the pressure rod is used for applying force to the pressure plate from top to bottom;
The pressure monitoring device is arranged between the lower end of the pressure rod and the pressure plate;
The application method of the sample preparation device simulating deep in-situ stress comprises the following steps:
Preparing lithofacies slices from stratum rock in a research area, obtaining rock particle size distribution, preparing aggregate according to a certain grading, mixing the prepared aggregate with slurry to obtain mixed fluid, introducing the mixed fluid into a high-rigidity container through a slurry inlet, and plugging the slurry inlet and the slurry outlet when the mixed fluid stably flows out from the slurry outlet;
Subsequently applying a force to the pressure plate via the pressure bar, monitoring the applied force via the pressure monitoring device, adjusting the applied force to a target value;
When the pressure reaches the target value, stabilizing the pressure value to a value, displaying the value stably, enabling the pressure plate not to descend any more, and then curing the aggregate and the slurry;
and after curing, taking out the mixture to obtain the rock-like material.
8. The sample preparation device for simulating deep in-situ stresses of claim 7, wherein: the slurry outlet and the slurry inlet are located on opposite sides of the high stiffness vessel, respectively.
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| CN202210337676.4A CN114858545B (en) | 2022-04-01 | 2022-04-01 | Sample preparation method and device for simulating deep in-situ ground stress and application method of sample preparation method and device |
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| CN202210337676.4A CN114858545B (en) | 2022-04-01 | 2022-04-01 | Sample preparation method and device for simulating deep in-situ ground stress and application method of sample preparation method and device |
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| CN114199647A (en) * | 2021-12-13 | 2022-03-18 | 四川大学 | Rock mass in-situ stress curing method and curing system |
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