CN206725131U - Semi-implantation type bottom hole fiber grating strain meter geostress survey device - Google Patents
Semi-implantation type bottom hole fiber grating strain meter geostress survey device Download PDFInfo
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- CN206725131U CN206725131U CN201720485868.4U CN201720485868U CN206725131U CN 206725131 U CN206725131 U CN 206725131U CN 201720485868 U CN201720485868 U CN 201720485868U CN 206725131 U CN206725131 U CN 206725131U
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Abstract
The utility model provides a kind of semi-implantation type bottom hole fiber grating strain meter geostress survey device, including fiber grating strain meter probe, injection end optical cable, transmission end optical cable, fiber grating regulation analyzer, signal wire, data collection host, the mounting rod with erector.The fiber grating strain meter probe includes pedestal, is installed on the semi-implantation type epoxy resin substrate of pedestal, six fiber grating strain meters are circumferentially spaced 60 ° and are fixed on epoxy resin substrate, and both ends are connected with injecting end optical cable and transmission end optical cable respectively after six fiber grating strain meter series connection, inject end optical cable and transmission end optical cable to be connected with fiber grating regulation analyzer, fiber grating regulation analyzer is connected by signal wire with data collection host.The utility model has coupled fiber-optic grating sensor nucleopore bottom strain gauge technique, has the advantages that small volume, measurement range are wide, easy to install, measuring accuracy is high and active time is long, approach new, that precision is higher is provided for complicated rock mass geostress survey.
Description
Technical field
It the utility model is related to complicated rock mass drilling geostress survey field, specifically a kind of semi-implantation type bottom hole optical fiber light
Grid strain gauge geostress survey device.
Background technology
The presence of rock mass initial field stress and its significant impact to rock mass engineering project, become the weight of engineering rock mass mechanics
Want research contents.Whether reasonable initial in-site stress field feature employed in engineering is, will directly affect the reliability of engineering design
With engineering operation security.Therefore, increasing large-scale mining engineering and Hydraulic and Hydro-Power Engineering all carried out it is very detailed,
A variety of earth stress measuring method joint tests and the work of analysis and research.
Concept and the nineteen fifty-three Sweden scholar of crustal stress are stored in rock mass is proposed from Switzerland scholar Heim early 20th century
N.Hast has used piezomagnetic stressometer since four mining areas on the Na Weiya peninsulas carry out geostress survey, a variety of detecting earth stress
Method is developed, and can be divided into rock mass surface stress measurement method and drilling hole stress mensuration according to measure theory and method.Wherein,
Rock mass surface stress measurement method is a kind of more measuring method of early application, and this method is with being mainly used in cavern or earth's surface position
Stress measurement, mainly there are surface stress overcoring method and surface stress restoring method.
Drilling hole stress mensuration mainly has borehole wall stress relief method and hydraulic fracturing.ISRM tries
The method of testing that the proved recipe method committee suggests has following four：Hydraulic fracturing, borehole wall stress relief method, flat jack method
With USBM boring aperture deformation gauge methods, that commonly uses in engineering mainly has borehole wall stress relief method and hydraulic fracturing.Recently
During the last ten years, rock stress measuring technology slower development.Japanese rock mechanics expert Sugawara proposes the tapered releasing of bottom hole
Method, this method are not required to the coring requirement in traditional overcoring, need to only be ground in bottom hole and arrange strain gauge on a tapered concave surface.
But due to being influenceed by bottom hole sediment, successfully tested rate is not high.Domestic expert Ge Xiurun etc., which does painstaking research, proposes measure deep rock
New method-local borehole-wall complete stress relief method of body stress, corresponding detecting earth stress equipment is have developed, and in silk screen
Power station is measured, this method need in drilling axis direction carry out drilling releasing, it is therefore desirable to arrange big mouth
Footpath testing bore holes, another test technology and equipment are complicated, and successfully tested rate is low.V.Saati etc. carries out ground by joint-cutting in the borehole
The risk of joint-cutting saw blade bit freezing be present when fragmented rock body is tested in stress measurement, this method.
Geostress survey technology needs to be tested in the preferable hole section of rock-mass quality in conventional drilling.But in high stress
Under environment, in the drilling process that drills, due to splitting cake phenomenon caused by core fracture caused by the stress concentration close to drill bit
And the test that can not succeed；Integrality is poor and cranny development can not also meet coring requirement.
The fiber-optic grating sensor that developed recently gets up have good electrical insulating property, corrosion-resistant, small volume, transmission loss it is small,
The advantages that measurement range is wide, Remote Networked and scale are big, is widely used in engineering, and fiber grating strain meter
Measured position is easily installed, different mounting means may be selected according to different monitoring physical quantitys.Therefore, the utility model is by optical fiber
Grating strain meter is introduced into geostress survey, and approach new, that precision is higher is provided for complicated rock mass geostress survey.
Utility model content
The utility model is directed to existing detecting earth stress technology above shortcomings under complex geological condition, it is proposed that
A kind of semi-implantation type bottom hole fiber grating strain meter geostress survey device, it uses fiber grating strain meter to be arranged in asphalt mixtures modified by epoxy resin
Aliphatic radical piece, the implant bore bottom hole of substrate half is then subjected to detecting earth stress, suitable for integrality is poor, cranny development and it is high should
Geostress survey under the conditions of power under the complex geological condition of the easy cake of rock core, being provided for engineering design, construction, hazard prediction can
The basic data leaned on.
To achieve the above object, the technical solution adopted in the utility model is：
A kind of semi-implantation type bottom hole fiber grating strain meter geostress survey device, including fiber grating strain meter probe,
Inject end optical cable, transmission end optical cable, fiber grating regulation analyzer, signal wire, data collection host, the installation with erector
Bar, the fiber grating strain meter probe include pedestal, are installed on the semi-implantation type epoxy resin substrate of pedestal, six optical fiber light
Grid strain gauge is circumferentially spaced 60 ° and is fixed on epoxy resin substrate, and after six fiber grating strain meters series connection both ends respectively with
Inject end optical cable to connect with transmission end optical cable, the mounting rod with erector by probe based on fiber grating strain by being attached to survey
Hole test position, inject end optical cable and transmission end optical cable and be connected with fiber grating regulation analyzer, fiber grating regulation analyzer
It is connected by signal wire with data collection host.
Further, carving depth around circumferentially spaced about 60 ° that radius is 5mm on semi-implantation type epoxy resin substrate is
0.4mm, the semi-cylindrical groove that length is 10mm, six fiber grating strain meters are fixed respectively in the form of connecting to be pasted correspondingly
Semi-cylindrical groove in.
Further, a diameter of 48mm of semi-implantation type epoxy resin substrate, thickness 1mm, the length of semi-cylindrical groove
For 10mm, depth 0.4mm, fiber grating strain meter a diameter of 0.8mm, length 10mm.
Further, the pedestal includes joint and fiber grating strain meter protecting bin, and the fiber grating strain meter is protected
The circular cylindrical cavity structure that storehouse is inner hollow is protected, joint is the circular cylindrical cavity connected with fiber grating strain meter protecting bin,
Fiber grating strain meter protecting bin openend is adhesively fixed after being alignd in concentric circles with semi-implantation type epoxy resin substrate,
The vaseline poured into by joint after liquefaction is to fiber grating strain meter protecting bin, to reach waterproof and protect fiber grating strain
The effect of meter.
As a result of above technical scheme, the utility model has following good effect and advantage：(1) due to introducing
Fiber grating strain meter, the equipment have the advantages that electrical insulating property is good and small volume, are affected by the external environment during test smaller；
(2) fiber grating strain meter measurement range is wide, and measurement accuracy is higher；(3) the utility model device should using six fiber gratings
Become meter series connection, use wavelength-division multiplex technique, as long as ensureing there are 3 strain gauges not destroyed and be achieved with service state
Successfully test achievement；(4) fiber grating strain meter active time is longer, available in prolonged stress monitoring；(5) due to
Substrate is partly implanted in drilling hole baseplane, when carrying out detecting earth stress using the device, it is only necessary to obtain the rock of drilling hole bottom thin slice
The heart, it is therefore particularly suitable for the poor country rock of integrality and rock mass stress measures in high stress environment.
Brief description of the drawings
Fig. 1 is the decomposition texture schematic diagram that fiber grating strain meter is popped one's head in the utility model；
Fig. 2 is the structural representation after the assembling of fiber grating strain meter probe in the utility model；
Fig. 3 is arrangement schematic diagram of the fiber grating strain meter on semi-implantation type epoxy resin substrate in the utility model；
Fig. 4 is the profile of pedestal in the utility model；
Fig. 5 is the series arrangement schematic diagram of fiber grating strain meter in the utility model；
Fig. 6 is the utility model borehole test arrangement schematic diagram.
In figure：1-the first fiber grating strain meter, the 2-the second fiber grating strain meter, the 3-the three fiber grating strain
Meter, the 4-the four fiber grating strain meter, the 5-the five fiber grating strain meter, the 6-the six fiberses grating strain meter, 7-inject
Optical cable is held, 8-transmission end optical cable, 9-semi-implantation type epoxy resin substrate, 10-pedestal, 11-joint, 12-fiber grating should
Become meter protecting bin, 13-fiber grating strain meter probe, 14-fiber grating regulation analyzer, 15-signal wire, 16-data
Gather main frame, the 17-mounting rod with erector, 18-test optical fibre cables.
Embodiment
Below in conjunction with the accompanying drawing in the utility model, the technical scheme in the utility model is carried out clearly and completely
Description.
Referring to Fig. 6, the utility model provides a kind of semi-implantation type bottom hole fiber grating strain meter geostress survey device, its
Realized based on optical fiber grating sensing, be adapted to the geostress survey of breaking surrounding rock.Described device is popped one's head in including fiber grating strain meter
13rd, end optical cable 7, transmission end optical cable 8 are injected, fiber grating regulation analyzer 14, signal wire 15, data collection host 16, is carried
The mounting rod 17 of erector.
Referring to Fig. 1-5, semi-implantation type rings that fiber grating strain meter probe 13 includes pedestal 10, is installed on pedestal 10
Epoxy resin-based 9, (i.e. the first fiber grating should for six fiber grating strain meters on semi-implantation type epoxy resin substrate 9
Become the 1, second fiber grating strain meter 2 of meter, the 3rd fiber grating strain meter 3, the 4th fiber grating strain meter 4, the 5th optical fiber light
Grid strain gauge 5, six fiberses grating strain meter 6).On semi-implantation type epoxy resin substrate 9 on the circumference that radius is 5mm
Interval 60 ° carve depth be 0.4mm, the semi-cylindrical groove that length is 10mm, and by six fiber grating strain meters (1-6) with go here and there
The form of connection is fixed respectively to be pasted in corresponding semi-cylindrical groove, realizes fiber grating strain meter and semi-implantation type substrate 9
Encapsulation is fixed.One end of fiber grating strain meter (1-6) series connection is connected with injecting end optical cable 7, the other end and transmission end optical cable 8
Connection.
A diameter of 48mm of the substrate of semi-implantation type epoxy resin described in the present embodiment 9, thickness 1mm.Described half is implanted into
The length of the upper half cylindrical recess of formula epoxy resin substrate 9 is 10mm, depth 0.4mm.The fiber grating strain meter (1-6) is straight
Footpath is 0.8mm, length 10mm.The size can meet conventional aperture for different size drilling hole stress such as 75mm, 91mm, 95mm
The aperture of measurement requires.
Referring to Fig. 1 and Fig. 4, the pedestal 10 includes joint 11 and fiber grating strain meter protecting bin 12, the optical fiber light
Grid strain gauge protecting bin 12 can be the circular cylindrical cavity structure of inner hollow, and joint 11 is and fiber grating strain meter protecting bin 12
The circular cylindrical cavity of connection, the injection end optical cable 7 being connected with fiber grating strain meter (1-6), transmission end optical cable 8 are via pedestal
10 draw, then with In Aluminium Foil Packing into test optical fibre cables 18 (as shown in Figure 6).The wall thickness of the fiber grating strain meter protecting bin 12
4mm, it is highly 20mm.The wall thickness of the joint 11 is 3mm, is highly 20mm.
Referring to Fig. 6, fiber grating strain meter probe 13 is attached to by gaging hole test using the mounting rod 17 with erector
Position, what is be connected with fiber grating strain meter (1-6) injects end optical cable 7, the test optical fibre cables 18 that transmission end optical cable 8 forms and optical fiber
Grating regulation analyzer 14 is connected, and fiber grating regulation analyzer 14 is connected by signal wire 15 and data collection host 16
Connect.The mounting rod 17 with erector is cylindrical structural, length 1.5m.
Using said apparatus, specifically installation and testing program are as follows in the borehole：
(1) 60 ° of quarters, six semi-cylindrical grooves are circumferentially spaced in semi-implantation type epoxy resin substrate 9, and six is connected
Fiber grating strain meter (1-6) respectively in the fixed semi-cylindrical groove for pasting semi-implantation type substrate 9.
(2) what will be connected with fiber grating strain meter (1-6) injects end optical cable 7 and transmission end optical cable 8 through pedestal 10
Fiber grating strain meter protecting bin 12, is then passed from joint 11.
(3) by the openend of fiber grating strain meter protecting bin 12 of pedestal 10 with semi-implantation type epoxy resin substrate 9 with same
The mode of heart circle is alignd, and by the two stickup together.
(4) heat industrial vaseline makes its liquefaction, and is poured into by joint 11 to fiber grating strain meter protecting bin 12,
In terms of having the function that waterproof and protect fiber grating strain (1-6).Treat that vaseline cools down, and swathed with aluminium foil and inject end optical cable
7 and transmission end optical cable 8 form test optical fibre cables 18, so far fiber grating strain meter probe 13 i.e. machine.
(5) select suitable depth to be tested according to core and borehole television, bottom hole is milled to light using drill bit is polished
Cunning is smooth.
(6) clear water flushing hole bottom is used after polishing bottom hole, after taking out drill bit, bottom hole is cleaned using acetone etc., using roaster
Bottom hole is dried.
(7) according to formula and cavern's temperature allotment glue, according to the solidification situation of glue, preparation is applied in right times
On the substrate 9 of good fiber grating strain meter probe 13.
(8) the fiber grating strain meter probe 13 after gluing is installed to rapidly hole by the mounting rod 17 with erector
The pressure of fiber grating strain meter 13 pairs of bottom holes of probe is kept on bottom face, after being installed in place.First fiber grating strain
Meter 1 install successfully after drilling hole bottom the vertical upward direction that is projected as, as 0 °, the second fiber grating strain meter 2 be 60 °,
By that analogy.
(9) after glue is fully cured, erector is taken out, test optical fibre cables 18 are connected with fiber grating regulation analyzer 14,
The service state of fiber grating strain meter (1-6) is checked using fiber grating regulation analyzer 14, as long as not in same straight line
Three fiber grating strain meters be in service state, so that it may the test result succeeded.
(10 wash by water into drilling and read the stable reading of fiber grating strain meter (1-6) as initial value.Often release 1cm
Reading 1 time, more than every 2cm readings 1 time after bore diameter, until releasing end or core read stabilization reading after breaking.
(11) fiber grating regulation analyzer 14 is connected by signal wire 15 with data collection host 16, reads strain
Value, the strain value of test position is obtained by data processing.
The relation for the crustal stress states that the secondary stress state in bottom hole centre is expressed with borehole coordinate system, according to formula
(1) it is
Because the drilling hole baseplane components of stress there is no economics analysis solution with country rock crustal stress states, therefore, to expression formula
(1) mesopore baseplane factor of stress concentration a, b, c, d, can only be tried to achieve by model test and FEM calculation.Fan Xierdun (Van
Heerden) factor of stress concentration obtained by model test is a=d=1.25, b=0, c=-0.75 (0.65+ μ)；Crewe
(Cruy, R.V.) by FEM calculation, as μ=0.2, the factor of stress concentration of acquirement is：A=1.30, b=0.075,
C=0.655, d=1.417；The factor of stress concentration that Changsha Mining ＆ Metallurgy Inst, Lanzhou University obtain also by FEM calculation
For：A=1.392-0.107 μ, b=-0.192+0.393 μ, c=-0.4-1.06 μ, d=1.584-0.5 μ, as μ=0.2, a
=1.3706, b=-0.1134, c=-0.612, d=1.484.
The relation for the components of stress that bottom hole strain observation value is expressed with borehole coordinate system：
Principles above illustrates, the strain variation value at drilling hole bottom is read by surveying, rock can be deduced out using inverse analysis method
The initial stress values of body.
The utility model has coupled fiber-optic grating sensor nucleopore bottom strain gauge technique, has small volume, measurement range wide, easy
The advantages that installation, long measuring accuracy height and active time, way new, that precision is higher is provided for complicated rock mass geostress survey
Footpath.When carrying out detecting earth stress using the device, it is only necessary to the complete core of 1cm length is obtained, be therefore particularly suitable for relatively crushing,
Coal petrography and the rock mass stress measurement in high stress environment.
It is described above, only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to
It is any to belong to those skilled in the art in the technical scope that the utility model discloses in this, the change that can be readily occurred in
Change or replace, should all cover within the scope of protection of the utility model.Therefore, the scope of protection of the utility model should be with power
The protection domain that profit requires is defined.
Claims (4)
- A kind of 1. semi-implantation type bottom hole fiber grating strain meter geostress survey device, it is characterised in that：Should including fiber grating Become meter probe (13), inject end optical cable (7), transmission end optical cable (8), fiber grating regulation analyzer (14), signal wire (15), number According to collection main frame (16), the mounting rod (17) with erector, fiber grating strain meter probe (13) include pedestal (10), The semi-implantation type epoxy resin substrate (9) of pedestal (10) is installed on, six fiber grating strain meters (1-6) are circumferentially spaced 60 ° Be fixed on epoxy resin substrate (9), and after six fiber grating strain meters (1-6) series connection both ends respectively with injecting end optical cable (7) Connected with transmission end optical cable (8), the mounting rod (17) with erector based on fiber grating strain by that probe (13) will be attached to Gaging hole test position, inject end optical cable (7) and transmission end optical cable (8) and be connected with fiber grating regulation analyzer (14), optical fiber light Grid regulation analyzer (14) is connected by signal wire (15) with data collection host (16).
- 2. semi-implantation type bottom hole fiber grating strain meter geostress survey device as claimed in claim 1, it is characterised in that：Half The circumferentially spaced about 60 ° of quarters depth for being 5mm around radius on implanted epoxy resin substrate (9) is 0.4mm, half that length is 10mm Cylindrical recess, six fiber grating strain meters (1-6) are fixed respectively in the form of series connection to be pasted in corresponding semi-cylindrical groove.
- 3. semi-implantation type bottom hole fiber grating strain meter geostress survey device as claimed in claim 2, it is characterised in that：Half A diameter of 48mm of implanted epoxy resin substrate (9), thickness 1mm, the length of semi-cylindrical groove is 10mm, and depth is 0.4mm, fiber grating strain meter (1-6) a diameter of 0.8mm, length 10mm.
- 4. semi-implantation type bottom hole fiber grating strain meter geostress survey device as claimed in claim 1, it is characterised in that：Institute Stating pedestal (10) includes joint (11) and fiber grating strain meter protecting bin (12), the fiber grating strain meter protecting bin (12) For the circular cylindrical cavity structure of inner hollow, joint (11) is the cylindrical cavity connected with fiber grating strain meter protecting bin (12) Body, fiber grating strain meter protecting bin (12) openend are alignd in concentric circles with semi-implantation type epoxy resin substrate (9) After be adhesively fixed, by joint (11) pour into liquefaction after vaseline to fiber grating strain meter protecting bin (12), to reach anti- Water and the effect for protecting fiber grating strain meter (1-6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720485868.4U CN206725131U (en) | 2017-05-04 | 2017-05-04 | Semi-implantation type bottom hole fiber grating strain meter geostress survey device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720485868.4U CN206725131U (en) | 2017-05-04 | 2017-05-04 | Semi-implantation type bottom hole fiber grating strain meter geostress survey device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106918415A (en) * | 2017-05-04 | 2017-07-04 | 长江水利委员会长江科学院 | Semi-implantation type bottom hole fiber grating strain meter geostress survey device and method |
| CN109141269A (en) * | 2018-10-09 | 2019-01-04 | 中国地震局地壳应力研究所 | Distributed fiber grating hole wall strain gauge |
| CN109141271A (en) * | 2018-10-22 | 2019-01-04 | 中国地震局地壳应力研究所 | Multi-point type optical fiber grating bottom hole strain gauge |
| CN115541064A (en) * | 2022-11-24 | 2022-12-30 | 云南省交通投资建设集团有限公司 | Stress monitoring probe and method suitable for high-ground-stress tunnel chaplet surface |
-
2017
- 2017-05-04 CN CN201720485868.4U patent/CN206725131U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106918415A (en) * | 2017-05-04 | 2017-07-04 | 长江水利委员会长江科学院 | Semi-implantation type bottom hole fiber grating strain meter geostress survey device and method |
| CN106918415B (en) * | 2017-05-04 | 2023-01-06 | 长江水利委员会长江科学院 | Device and method for measuring ground stress of semi-implanted hole bottom fiber grating strain gauge |
| CN109141269A (en) * | 2018-10-09 | 2019-01-04 | 中国地震局地壳应力研究所 | Distributed fiber grating hole wall strain gauge |
| CN109141269B (en) * | 2018-10-09 | 2023-08-15 | 应急管理部国家自然灾害防治研究院 | Distributed fiber grating hole wall strain gauge |
| CN109141271A (en) * | 2018-10-22 | 2019-01-04 | 中国地震局地壳应力研究所 | Multi-point type optical fiber grating bottom hole strain gauge |
| CN109141271B (en) * | 2018-10-22 | 2023-08-15 | 应急管理部国家自然灾害防治研究院 | Multi-point optical fiber grating hole bottom strain gauge |
| CN115541064A (en) * | 2022-11-24 | 2022-12-30 | 云南省交通投资建设集团有限公司 | Stress monitoring probe and method suitable for high-ground-stress tunnel chaplet surface |
| CN115541064B (en) * | 2022-11-24 | 2023-03-10 | 云南省交通投资建设集团有限公司 | Stress monitoring probe and method suitable for high-ground-stress tunnel chaplet surface |
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Granted publication date: 20171208 Termination date: 20200504 |