CN103234839A - In-situ direct shear tester for soil bodies - Google Patents
In-situ direct shear tester for soil bodies Download PDFInfo
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- CN103234839A CN103234839A CN2013101453057A CN201310145305A CN103234839A CN 103234839 A CN103234839 A CN 103234839A CN 2013101453057 A CN2013101453057 A CN 2013101453057A CN 201310145305 A CN201310145305 A CN 201310145305A CN 103234839 A CN103234839 A CN 103234839A
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Abstract
The invention discloses an in-situ direct shear tester for soil bodies. The in-situ direct shear tester comprises a steel frame, a vertical oil cylinder, a cylinder, a horizontal oil cylinder and a push bowl, wherein the vertical oil cylinder is arranged on the steel frame; the cylinder can be horizontally and movably arranged at the power output end of the vertical oil cylinder; the horizontal oil cylinder is arranged on the steel frame; the push bowl is arranged at the power output end of the horizontal oil cylinder, and used for exerting a horizontal thrust on the cylinder, and enabling the cylinder to move a predetermined distance; and the horizontal oil cylinder is also provided with a displacement sensor for measuring the displacement and a first pressure sensor for measuring the thrust, and the vertical oil cylinder is also provided with a second pressure sensor for measuring the lateral pressure. According to the in-situ direct shear tester, the vertical oil cylinder and the horizontal oil cylinder are adopted for automatically and gradually exerting horizontal and vertical loads, and then the cohesion, internal friction angle standard value and pressure-deformation curve of a soil body are obtained by using a shear test; and the tester is accurate in testing, flexible to operate and reliable in result.
Description
Technical field
The present invention relates to the soil in-situ technical field of measurement and test, especially relate to the soil body and shear the original position experimental apparatus.
Background technology
The soil shear strength trial value is divided into indoor shearing experiment at present and the scene is cut experiment, cross shearing experiment greatly, the ultimate principle of determining is identical with theoretical foundation, and its result's utilizability key is that the mensuration of choosing general soil shear strength of test method mainly contains direct shear test, in-situ direct shear test.
Direct shear test is measure native shearing strength a kind of, common method adopts 4 samples usually, under different pressure at right angles, apply horizontal shear force and shear respectively, the shear stress of trying to achieve when destroying is determined native shear strength parameter internal friction and cohesive strength according to Coulomb's law then.
Direct shear test have soon cut, fixedly cut soon, three kinds of methods such as slow shear, no matter be three shearings or conventional direct shear test, all require to gather at the scene undisturbed soil sample, under different pressure, drainage condition and environment, test then, with determine the soil body, the indoor direct shear test of value artificially controls shear surface, and drainage condition also is difficult to control, and makes the natural situation of stress state and the soil body have greater difference, and because that sample requires is more, be difficult to guarantee that one of soil sample state makes peace evenly.
Said method also exists local location and fetches earth, and it is too small that soil sample is cut face, the weakness that the result " is fanned out from point to area ".
Summary of the invention
Problem at the prior art existence, the object of the present invention is to provide a kind of soil in-situ direct shear test instrument, not only light, pressuring method is simple, and test that can the multiple spot different depth, be fit to the multiple soil body, obtain stress-strain curve and parameters such as cohesive strength, angle of internal friction.
A kind of soil in-situ direct shear test instrument of the present invention comprises:
Steelframe;
Vertical oil cylinder is arranged on the described steelframe;
Cylinder can be arranged on the clutch end of described vertical oil cylinder with moving horizontally;
Cross cylinder is arranged on the described steelframe;
Push away bowl, be arranged on the clutch end of described cross cylinder, be used for described cylinder is applied the thrust of level, and make described cylinder move predetermined distance;
Wherein, on described cross cylinder, also be provided with for the displacement transducer of measuring displacement with for first pressure transducer of measuring thrust, on described vertical oil cylinder, also be provided with for second pressure transducer of measuring side pressure.
The present invention uses vertical oil cylinder and cross cylinder progressively to apply level and vertical load automatically, utilizes shearing experiment to obtain soil body cohesive strength, angle of internal friction standard value, pressure-deformation curve, the test instrument test accurately, flexible operation, reliable results.
Description of drawings
Fig. 1 is direct shearing test planimetric map of the present invention;
Fig. 2 is Fig. 1 elevational schematic view.
Embodiment
As shown in Figure 1, 2, the present invention includes: steelframe 1, vertical oil cylinder 2, cross cylinder 3 and cylinder 4.Vertical oil cylinder 2 is arranged on the steelframe 1, and cylinder 4 can be arranged on the clutch end of vertical oil cylinder 2 with moving horizontally by horizontal slide rail 12; Cross cylinder 3 is arranged on the steelframe 1; Push away the clutch end that bowl 11 is arranged on cross cylinder 3, be used for cylinder 4 is applied the thrust of level, and make cylinder 4 move predetermined distance, so that the soil body in the cylinder 4 and the cylinder 4 outer soil bodys are sheared.
In addition, on cross cylinder 3, also be provided with for the displacement transducer 6 of measuring land movement with for first pressure transducer 7 of measuring the suffered thrust of the soil body, on vertical oil cylinder 2, also be provided with for second pressure transducer 8 of measuring soil body simulation side pressure.
The data transmission that above-mentioned displacement transducer 6, first pressure transducer 7 and second pressure transducer 8 are measured is given processing unit 10 storages and is handled.Vertical oil cylinder 2 and cross cylinder 3 are by hydraulic pump 9 controls.
In addition, can also be provided for taking whole soil in-situ ring at steelframe 1 and cut the video camera of process (not shown go out).
When the present invention uses,
1) select the cylinder of steel of higher stiffness for detection of experiment;
2) in jar, fill the simulation soil body;
3) hydraulic cylinder vertically is pressed into cylinder 4 below the soil body 10mm;
4) artificial mamoty on every side goes out;
5) cross cylinder 3 drives and pushes away 11 pairs of cylinder 4 application of forces of bowl, because the soil body and bulk soil body faying face only are subjected to pure shear in the guide effect cylinder 4 of horizontal slide rail 12, cross cylinder 3 outwards stretches with the speed of the per 100 seconds 1mm that advance, real-time sampling monitoring, record acting force and displacement relation, until soil body shear failure, obtain parameters such as cohesive strength, angle of internal friction.
6) visual device is recorded pressure pin stretching, extension and contraction return on the test instrument, the centering block rotation merges and load applies and test overall process, and it is visual to reach entire test.
In-situ direct shear test of the present invention is owing to test is carried out at the scene, there is not the slight disturbance of transportation, the variation of water cut also can not take place, the native state that can keep soil structures to greatest extent, the stress state that has guaranteed the soil body does not change, and its stress path also can be determined according to the engineering actual conditions, thereby more can meet native state than shop experiment.
In addition, the present invention can also apply horizontal thrust along glide direction, and can directly be fixed on shear surface on the sliding surface and shear, and shear area is bigger, and is representative, so the original position shear test can truly reflect unearthed actual shearing strength.
Because in-situ direct shear test is generally measured by the mode of digging vertical shaft, experimental enviroment is very poor, simultaneously, the error of artificial reading is a very big source of measuring error, systematic measurement error largely depends on experimenter's operant level and test technical ability, in order to improve the experimental enviroment of in-situ test, reduce personal error.Automatically progressively apply vertical load to the lower compression soil body by hydraulic pump 9, utilize stress and displacement transducer monitoring earth stress and distortion, and the collecting test data are also stored automatically, record plasticity, the breakdown strength parameter of each soil layer; Visual device records that pressure pin stretches and load applies and test overall process on the test instrument, and it is visual to reach entire test.
Claims (1)
1. a soil in-situ direct shear test instrument is characterized in that, comprising:
Steelframe;
Vertical oil cylinder is arranged on the described steelframe;
Cylinder can be arranged on the clutch end of described vertical oil cylinder with moving horizontally;
Cross cylinder is arranged on the described steelframe;
Push away bowl, be arranged on the clutch end of described cross cylinder, be used for described cylinder is applied the thrust of level, and make described cylinder move predetermined distance;
Wherein, on described cross cylinder, also be provided with for the displacement transducer of measuring displacement with for first pressure transducer of measuring thrust, on described vertical oil cylinder, also be provided with for second pressure transducer of measuring side pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310145305.7A CN103234839B (en) | 2013-04-24 | 2013-04-24 | Soil in-situ direct shear test instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310145305.7A CN103234839B (en) | 2013-04-24 | 2013-04-24 | Soil in-situ direct shear test instrument |
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| Publication Number | Publication Date |
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| CN103234839A true CN103234839A (en) | 2013-08-07 |
| CN103234839B CN103234839B (en) | 2016-01-13 |
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| CN201310145305.7A Active CN103234839B (en) | 2013-04-24 | 2013-04-24 | Soil in-situ direct shear test instrument |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558096A (en) * | 2013-11-04 | 2014-02-05 | 中国地质科学院地质力学研究所 | Rock and earth mass in-situ direct shear test device with automatic data acquisition system and rock and earth mass in-situ direct shear test method |
| CN103728188A (en) * | 2013-12-18 | 2014-04-16 | 中国科学院力学研究所 | Soil mass in-situ shearing and static load tester |
| CN103806906A (en) * | 2014-01-26 | 2014-05-21 | 北京雷雨达科技有限公司 | Rock mass/soil mass drilling in-situ test device and method |
| CN103969131A (en) * | 2014-04-18 | 2014-08-06 | 辽宁省水利水电科学研究院 | Coarse-grained soil hydraulic shearing instrument |
| CN104807706A (en) * | 2015-04-27 | 2015-07-29 | 中国地质科学院探矿工艺研究所 | Portable soft and weak layer in-situ direct shear tester and testing method thereof |
| CN105445120A (en) * | 2015-01-06 | 2016-03-30 | 北京市道路工程质量监督站 | In-situ test method for shear strength of asphalt mixture |
| CN105928791A (en) * | 2016-05-04 | 2016-09-07 | 三峡大学 | Method of in-situ measurement of upper rock mass stress and in-situ direct shear test for weak intercalated layer between rock mass layers |
| CN105865940B (en) * | 2016-04-20 | 2018-11-23 | 重庆大学 | A kind of live sliding surface shear index test device of non-disturbance |
| CN108896414A (en) * | 2018-06-20 | 2018-11-27 | 中国科学院、水利部成都山地灾害与环境研究所 | A kind of Portable in-situ horizontal push-shear instrument |
| CN109580389A (en) * | 2019-01-25 | 2019-04-05 | 安阳师范学院 | Fiber reinforcement regeneration brick aggregate concrete shearing property testing device and method |
| CN110186816A (en) * | 2019-05-16 | 2019-08-30 | 中国地质大学（武汉） | A kind of experimental rig for testing granular materials micro kinetics characteristic |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558096A (en) * | 2013-11-04 | 2014-02-05 | 中国地质科学院地质力学研究所 | Rock and earth mass in-situ direct shear test device with automatic data acquisition system and rock and earth mass in-situ direct shear test method |
| CN103558096B (en) * | 2013-11-04 | 2016-01-20 | 中国地质科学院地质力学研究所 | With the Rock And Soil in-situ direct shear test device and method of automatic data acquisition system (ADAS) |
| CN103728188A (en) * | 2013-12-18 | 2014-04-16 | 中国科学院力学研究所 | Soil mass in-situ shearing and static load tester |
| CN103728188B (en) * | 2013-12-18 | 2015-11-18 | 中国科学院力学研究所 | Soil in-situ is sheared and static load test apparatus |
| CN103806906A (en) * | 2014-01-26 | 2014-05-21 | 北京雷雨达科技有限公司 | Rock mass/soil mass drilling in-situ test device and method |
| CN103969131A (en) * | 2014-04-18 | 2014-08-06 | 辽宁省水利水电科学研究院 | Coarse-grained soil hydraulic shearing instrument |
| CN103969131B (en) * | 2014-04-18 | 2016-01-20 | 辽宁省水利水电科学研究院 | Coarse-grained soil hydraulic cutter instrument |
| CN105445120A (en) * | 2015-01-06 | 2016-03-30 | 北京市道路工程质量监督站 | In-situ test method for shear strength of asphalt mixture |
| CN104807706A (en) * | 2015-04-27 | 2015-07-29 | 中国地质科学院探矿工艺研究所 | Portable soft and weak layer in-situ direct shear tester and testing method thereof |
| CN105865940B (en) * | 2016-04-20 | 2018-11-23 | 重庆大学 | A kind of live sliding surface shear index test device of non-disturbance |
| CN105928791A (en) * | 2016-05-04 | 2016-09-07 | 三峡大学 | Method of in-situ measurement of upper rock mass stress and in-situ direct shear test for weak intercalated layer between rock mass layers |
| CN105928791B (en) * | 2016-05-04 | 2018-11-30 | 三峡大学 | Rock mass interlayer weak intercalated layer base sample sample field direct shear test method |
| CN108896414A (en) * | 2018-06-20 | 2018-11-27 | 中国科学院、水利部成都山地灾害与环境研究所 | A kind of Portable in-situ horizontal push-shear instrument |
| CN109580389A (en) * | 2019-01-25 | 2019-04-05 | 安阳师范学院 | Fiber reinforcement regeneration brick aggregate concrete shearing property testing device and method |
| CN109580389B (en) * | 2019-01-25 | 2024-02-06 | 安阳师范学院 | Device and method for testing shear performance of fiber reinforced recycled brick aggregate concrete |
| CN110186816A (en) * | 2019-05-16 | 2019-08-30 | 中国地质大学（武汉） | A kind of experimental rig for testing granular materials micro kinetics characteristic |
| CN110186816B (en) * | 2019-05-16 | 2024-02-27 | 中国地质大学（武汉） | Test device for testing microscopic dynamics characteristics of granular materials |
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| CN103234839B (en) | 2016-01-13 |
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