CN102943460A - Pore pressure cross plate device capable of evaluating sand liquefaction potentiality - Google Patents
Pore pressure cross plate device capable of evaluating sand liquefaction potentiality Download PDFInfo
- Publication number
- CN102943460A CN102943460A CN2012105316270A CN201210531627A CN102943460A CN 102943460 A CN102943460 A CN 102943460A CN 2012105316270 A CN2012105316270 A CN 2012105316270A CN 201210531627 A CN201210531627 A CN 201210531627A CN 102943460 A CN102943460 A CN 102943460A
- Authority
- CN
- China
- Prior art keywords
- screw thread
- potentiality
- thread pipe
- circular tube
- cross plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a pore pressure cross plate device capable of evaluating sand liquefaction potentiality continuously and qualitatively. The upper part of the pore pressure cross plate device is provided with an upper thread circular tube (32) and the lower part of the pore pressure cross plate device is provided with a lower thread circular tube (31), the lower part of the upper thread circular tube (32) is connected with the lower thread circular tube (31), a pore water pressure sensor (2) is arranged in the upper thread circular tube (32) and a shaft rod (4), the upper part of the pore water pressure sensor (2) is connected with a power supply cable (1), the lower part of the lower thread circular tube (31) is connected with the shaft rod (4), a cross plate head that a pore-free plate head (52) and a porous plate head (51) are mutually vertically arranged is arranged outside the shaft rod (4), water permeating holes (6) are arranged in the middle of the porous plate head (51) along the radial direction of the lower thread circular tube (31), and a waterproof plug (7) is arranged on the bottommost end of the shaft rod (4). The pore pressure cross plate device has the characteristics of normal position, rapidness, accuracy, convenience and the like, and provides a strong detection tool for tailings dam evaluation, sand earthquake-induced liquefaction evaluation and geotechnical engineering foundation treatment practices.
Description
Technical field
The present invention relates to a kind of hole and press the four-bladed vane device, belong to a kind of testing arrangement that can estimate accurately, quantitatively saturated sand liquefaction potentiality in the field of civil engineering.
Background technology
Since Casagrande in 1976 need to propose development in-situ test sand liquefaction potentiality technology, existing many measuring technologies were applied to this on the one hand, wherein common are the most standard penetration test (SPT) and piezocone test (CPT).The sand liquefaction potentiality is mainly rule of thumb estimated in these two kinds of tests, so that there is larger limitation in measuring technology.Obtain at present relevant sand cut swollen/cut contracting trend and stable state shear strength mainly by laboratory test and relevant field trial index.Soil layer original position pore water pressure force measurement helps to estimate the sand liquefaction potentiality, is the basis of sand liquefaction because pore water pressure changes.The pore water pressure that many scholars cause when attempting to adopt the hole to press the static sounding technology to come the measuring probe injection changes, and then evaluation sand liquefaction potentiality, but because the complexity of sand damage model, volumetric strain that cavity expansion causes and the factors such as uncertainty of pore water pressure measuring position become comparatively complicated so that set forth in theory the sand liquefaction potentiality.Vane shear test (VST) is applicable to the undrained shear strength of the saturated soil body of in-site detecting, and its shear strength value of surveying is equivalent to test in position fixed undrained shear strength under the pressure of the natural soil layer of depth.VST does not need to gather soil sample, has avoided soil sample disturbance, natural strain condition to change and loaded down with trivial details laboratory test, is a kind of effective home position testing method.
The present invention is based on conventional cross plate shearing instrument, proposed a kind of can be accurately, quantitatively, in-situ testing device efficiently, for Sand Liquefaction evaluation and geotechnical engineering ground processing etc. provides accurately and effectively means ofquantity evaluation.
Summary of the invention
Technical problem: the technical problem to be solved in the present invention is the in situ quantitation evaluation that can't carry out saturated sand liquefaction potentiality at present domestic, presses the four-bladed vane device but propose a kind of hole that can be used for the in situ quantitation evaluation saturated sand liquefaction potentiality in geotechnical engineering field.
Technical scheme: it is upper screw thread pipe that the top of four-bladed vane device is pressed in the hole of estimating the sand liquefaction potentiality of the present invention, the bottom is lower screw thread pipe, the bottom of upper screw thread pipe is connected with lower screw thread pipe, be provided with pore water pressure sensor in upper screw thread pipe and axostylus axostyle, the top of pore water pressure sensor connects feed cable; Connect axostylus axostyle in the bottom of lower screw thread pipe, be provided with by atresia wrench and the mutual vertically disposed cross wrench of porose wrench in the axostylus axostyle outside, the middle part of porose wrench along under the screw thread pipe radially be provided with permeable hole, be waterproof plug at the lowermost end of axostylus axostyle.
2 permeable holes of each abacus centriciput, the aperture is 1.5mm, spacing is 20mm.
The height of cross wrench is 100mm, and diameter is 50mm, and thickness is 3mm.
The diameter of axostylus axostyle is 20mm.
The diameter of upper screw thread pipe is 20mm, and the diameter of lower screw thread pipe is 25mm.
The four-bladed vane device is pressed in the hole of estimating saturated sand liquefaction potentiality of the present invention, measuring pore water pressure is mainly finished by measurement systems such as pore water pressure sensor, permeable hole and axostylus axostyles, and its stable state soil shear strength measures and mainly partly finished by conventional four-bladed vane.By applying external torque, rotate four-bladed vane, shear the soil body, record simultaneously moment of torsion, pore water pressure and rotational angular velocity in the soil body shear history, can calculate soil stabilization state shear strength and estimate the liquefaction potentiality according to correlation theory.A large amount of theoretical research and measured datas show, when saturated sand was sheared, the pore water pressure rise/fall was closely related with the liquefaction potentiality.Pore water pressure increases when shearing, and shows as liquefaction potentiality sand; Pore water pressure reduces when shearing, and shows as non-liquefaction potentiality sand.
Beneficial effect: in the geotechnical engineering practice, the evaluation of sand liquefaction potentiality is most important.Original position assessment technique commonly used mainly contains standard penetration test (SPT) and piezocone test (CPT) etc. at present, yet these original position assessment techniques are mainly rule of thumb estimated the sand liquefaction potentiality, have larger limitation.Can obtain sand liquefaction trend and stable state shear strength by laboratory test and relevant in-situ test parameter, but be subjected to the factor affecting such as sampling disturbance, test method, its process is time-consuming, effort, and the result of the test reliability is lower.The vane-shear measuring technology the invention solves the defective of the evaluation saturated sand liquefaction potentiality that domestic existing in-situ testing technique can not be better, accurate, quantitative, so that can more fully be served the geotechnical engineering field.
Description of drawings
Fig. 1 is component arrangement figure of the present invention;
Wherein have: feed cable 1, pore water pressure sensor 2, lower screw thread pipe 31, upper screw thread pipe 32, axostylus axostyle 4, porose wrench 51, atresia wrench 52, permeable hole 6, waterproof plug 7.
Fig. 2 is A-A sectional view among Fig. 1 of the present invention.
The specific embodiment
The hole of estimating saturated sand liquefaction potentiality of the present invention presses the four-bladed vane device to comprise feed cable 1, pore water pressure sensor 2, lower screw thread pipe 31, upper screw thread pipe 32, axostylus axostyle 4, porose wrench 51, atresia wrench 52, permeable hole 6, waterproof plug 7; The top of this device is upper screw thread pipe 32, the bottom is lower screw thread pipe 31, the bottom of upper screw thread pipe 32 is connected with lower screw thread pipe 31, is provided with pore water pressure sensor 2 in upper screw thread pipe 32 and axostylus axostyle 4, and the top of pore water pressure sensor 2 connects feed cable 1; Bottom at lower screw thread pipe 31 connects axostylus axostyle 4, be provided with by atresia wrench 52 and porose wrench 51 mutual vertically disposed cross wrench in axostylus axostyle 4 outsides, the middle part of porose wrench 51 along under screw thread pipe 31 radially be provided with permeable hole 6, be waterproof plug 7 at the lowermost end of axostylus axostyle 4.
Permeable hole 6 quantity are 4, and the aperture is 1.5mm, and spacing is 20mm.
The four-bladed vane grease head highness is 100mm, and diameter is 50mm, and thickness is 3mm.
Axostylus axostyle 4 diameters are 20mm.
Two screw thread pipe diameters are respectively 20mm, 25mm.
A large amount of theoretical research and measured datas show, when saturated sand was sheared, the pore water pressure rise/fall was closely related with the liquefaction potentiality, and pore water pressure increases when shearing, and show as liquefaction potentiality sand; Pore water pressure reduces when shearing, and shows as non-liquefaction potentiality sand.
Cross plate shearing instrument is comparatively effectively in-situ test instrument of test soil body shear stress simultaneously, and the shear Strength Calculation method according to Cadling and Odenstad (1950) proposition obtains:
S
h＝S
v/K
In the formula, S
hFor level to shear strength, S
vTo shear strength, K is the lateral earth pressure force coefficient for vertically, and M is for applying moment of torsion, and H is the four-bladed vane grease head highness, and D is cross wrench diameter.
According to conventional vane shear test requirement, press the four-bladed vane device to be inserted into the appointment testing position in the hole, stop 2 ~ 3min, after dissipating fully substantially, the pore water pressure that injection causes begins shear test, shear angle speed is shown greatly 90 °/s and is carried out, and every 16ms records moment of torsion, pore water pressure and angular velocity simultaneously.
Theoretical and the above-mentioned shear Strength Calculation method in conjunction with the relevant liquefaction of Castro and Poulos (1977) proposition, can determine saturated sand liquefaction potentiality and stable state shear strength, be that the shear history pore water increases, then be defined as potential liquefying soil; Pore water pressure reduces, and then is defined as potential non-liquefying soil.
Claims (5)
1. the four-bladed vane device is pressed in the hole that can estimate the sand liquefaction potentiality, the top that it is characterized in that this device is upper screw thread pipe (32), the bottom is lower screw thread pipe (31), the bottom of upper screw thread pipe (32) is connected with lower screw thread pipe (31), be provided with pore water pressure sensor (2) in upper screw thread pipe (32) and axostylus axostyle (4), the top of pore water pressure sensor (2) connects feed cable (1); Bottom at lower screw thread pipe (31) connects axostylus axostyle (4), be provided with by atresia wrench (52) and the mutual vertically disposed cross wrench of porose wrench (51) in axostylus axostyle (4) outside, at the middle part of porose wrench (51) along lower screw thread pipe (31) radially be provided with permeable hole (6), be waterproof plug (7) at the lowermost end of axostylus axostyle (4).
2. the four-bladed vane device is pressed in the hole of estimating saturated sand liquefaction potentiality according to claim 1, it is characterized in that each porose wrench (51) middle part 2 permeable hole (6), and the aperture is 1.5mm, and spacing is 20mm.
3. the four-bladed vane device is pressed in the hole of estimating saturated sand liquefaction potentiality according to claim 1, and the height that it is characterized in that the cross wrench is 100mm, and diameter is 50mm, and thickness is 3mm.
4. the four-bladed vane device is pressed in the hole of estimating saturated sand liquefaction potentiality according to claim 1, and the diameter that it is characterized in that axostylus axostyle (4) is 20mm.
5. the four-bladed vane device is pressed in the hole of estimating saturated sand liquefaction potentiality according to claim 1, and the diameter that it is characterized in that screw thread pipe (32) is 20mm, and the diameter of lower screw thread pipe (31) is 25mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210531627.0A CN102943460B (en) | 2012-12-11 | 2012-12-11 | Pore pressure cross plate device capable of evaluating sand liquefaction potentiality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210531627.0A CN102943460B (en) | 2012-12-11 | 2012-12-11 | Pore pressure cross plate device capable of evaluating sand liquefaction potentiality |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102943460A true CN102943460A (en) | 2013-02-27 |
| CN102943460B CN102943460B (en) | 2014-08-13 |
Family
ID=47726440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210531627.0A Expired - Fee Related CN102943460B (en) | 2012-12-11 | 2012-12-11 | Pore pressure cross plate device capable of evaluating sand liquefaction potentiality |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102943460B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290006A (en) * | 2016-08-08 | 2017-01-04 | 河海大学 | A kind of assay device measuring the change of shear strength parameter in soft clay consolidation process |
| CN111257135A (en) * | 2020-01-21 | 2020-06-09 | 同济大学 | Test device and method for measuring shear rheological property of liquefiable soil in centrifugal field |
| WO2021253088A1 (en) * | 2020-06-18 | 2021-12-23 | Yvo Keulemans | A measuring device and method of use thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000080884A (en) * | 1998-09-08 | 2000-03-21 | Yuji Abe | Soil and underground water simultaneous sampling device |
| CN1560581A (en) * | 2004-02-20 | 2005-01-05 | 中国科学院力学研究所 | Dynamic pore water pressure measuring method |
| CN101865802A (en) * | 2010-05-26 | 2010-10-20 | 西安科技大学 | Soil in-situ shear resistance tester |
| CN102011389A (en) * | 2010-11-11 | 2011-04-13 | 广东永基建筑基础有限公司 | Soil body in situ test device and test method applying same |
| CN102607965A (en) * | 2012-03-13 | 2012-07-25 | 河海大学 | Double-cross detector and testing method for testing shearing strength values of soil mass in situ |
| CN102788731A (en) * | 2011-05-20 | 2012-11-21 | 天津市富楷程地质机械制造有限公司 | Vane-shear apparatus for reconnaissance |
-
2012
- 2012-12-11 CN CN201210531627.0A patent/CN102943460B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000080884A (en) * | 1998-09-08 | 2000-03-21 | Yuji Abe | Soil and underground water simultaneous sampling device |
| CN1560581A (en) * | 2004-02-20 | 2005-01-05 | 中国科学院力学研究所 | Dynamic pore water pressure measuring method |
| CN101865802A (en) * | 2010-05-26 | 2010-10-20 | 西安科技大学 | Soil in-situ shear resistance tester |
| CN102011389A (en) * | 2010-11-11 | 2011-04-13 | 广东永基建筑基础有限公司 | Soil body in situ test device and test method applying same |
| CN102788731A (en) * | 2011-05-20 | 2012-11-21 | 天津市富楷程地质机械制造有限公司 | Vane-shear apparatus for reconnaissance |
| CN102607965A (en) * | 2012-03-13 | 2012-07-25 | 河海大学 | Double-cross detector and testing method for testing shearing strength values of soil mass in situ |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290006A (en) * | 2016-08-08 | 2017-01-04 | 河海大学 | A kind of assay device measuring the change of shear strength parameter in soft clay consolidation process |
| CN106290006B (en) * | 2016-08-08 | 2018-11-23 | 河海大学 | A kind of experimental rig measuring shear strength parameter variation in soft clay consolidation process |
| CN111257135A (en) * | 2020-01-21 | 2020-06-09 | 同济大学 | Test device and method for measuring shear rheological property of liquefiable soil in centrifugal field |
| WO2021253088A1 (en) * | 2020-06-18 | 2021-12-23 | Yvo Keulemans | A measuring device and method of use thereof |
| EP4168770A4 (en) * | 2020-06-18 | 2024-07-24 | Yvo Keulemans | A measuring device and method of use thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102943460B (en) | 2014-08-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10816448B2 (en) | Device for measuring strength and strain softening parameters of saturated clay sample based on full-flow penetration | |
| CN103760320B (en) | The method of testing of swelled ground water cut and bulging force relation under tunnel support condition | |
| CN102011389B (en) | Rock-soil body in-situ test equipment and test method using same | |
| CN102900063B (en) | Dynamic pore-pressure static sounding probe for detecting sludge | |
| CN103174122B (en) | Lateral stress pore pressure probe used for testing soil static lateral pressure coefficient | |
| CN104142388B (en) | Original position static(al) press-in test method in boring | |
| CN104034608A (en) | Vertical pull-type bidirectional contact surface shearing strength parameter testing device and testing method | |
| CN103115832A (en) | Tester for soil pressure bearing and shearing test | |
| CN102518106B (en) | Method for determining the lateral earth pressure based on the multi-functional piezocone penetration test probe | |
| CN107389473A (en) | The assay method and Special direct shear apparatus of unsaturated soil shear strength parameter | |
| CN203551406U (en) | Soil-rock mass in-situ direct shear test device with automatic data acquisition system | |
| CN102865952A (en) | Nondestructive testing method for working stress of concrete | |
| CN110029692A (en) | The method for determining bearing capacity of single pile timeliness in weak soil based on SCPTu probe test value | |
| CN110045026A (en) | Utilize the method for acoustic emission identification rock fracture crack initiation stress | |
| CN102943460B (en) | Pore pressure cross plate device capable of evaluating sand liquefaction potentiality | |
| CN102943458A (en) | Device based on resistivity piezocone penetration test and saturated sandy soil dilatancy evaluation method | |
| CN103061320A (en) | Method for determining soil permeability coefficient on basis of piezocone sounding | |
| CN104535488A (en) | Device and method for in-situ measuring cohesive force and internal friction angle of slightly hard soil layer | |
| CN103061321A (en) | Cone penetrometer for evaluating penetration property of unsaturated soil | |
| CN204461908U (en) | A kind of soft clay undrained shear strength proving installation | |
| CN203824856U (en) | Device for in-situ determination of wash resistance of soil | |
| CN115341589A (en) | Pile foundation bearing characteristic test device considering high stratum stress influence and using method | |
| CN103276713B (en) | Environmental piezocone penetration test (CPTU) probe capable of evaluating permeability characteristic of saturated soil in site | |
| CN103074880A (en) | Micro pore pressure static sounding probe for effectively identifying soil layer interface | |
| CN105133563A (en) | In-situ test method and device for rapidly determining shear strength of deep soil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20161211 |