CN103234839B - Soil in-situ direct shear test instrument - Google Patents
Soil in-situ direct shear test instrument Download PDFInfo
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- CN103234839B CN103234839B CN201310145305.7A CN201310145305A CN103234839B CN 103234839 B CN103234839 B CN 103234839B CN 201310145305 A CN201310145305 A CN 201310145305A CN 103234839 B CN103234839 B CN 103234839B
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Abstract
The invention discloses a kind of soil in-situ direct shear test instrument, comprising: steelframe; Vertical Cylinders, is arranged on described steelframe; Cylinder, can be arranged on the clutch end of described Vertical Cylinders with moving horizontally; Cross cylinder, is arranged on described steelframe; Push away bowl, be arranged on the clutch end of described cross cylinder, for applying the thrust of level to described cylinder, and make described cylinder move predetermined distance; Wherein, described cross cylinder is also provided with the displacement transducer for measuring displacement and the first pressure transducer for measuring thrust, described Vertical Cylinders is also provided with the second pressure transducer for measuring side pressure.The present invention uses Vertical Cylinders and cross cylinder progressively applying level and vertical load automatically, utilizes shearing experiment to obtain soil body cohesive strength, angle of internal friction standard value, pressure-deformation curve, and test instrument test is accurate, flexible operation, reliable results.
Description
Technical field
The present invention relates to soil in-situ technical field of measurement and test, especially relate to the soil body and shear original position experimental apparatus.
Background technology
Soil shear strength trial value is divided into indoor shearing experiment and scene to cut greatly experiment, cross shear experiment at present, the elementary principle and theory determined is according to being identical, and the utilizability key of its result is that the mensuration choosing general soil shear strength of test method mainly contains direct shear test, in-situ direct shear test.
Direct shear test is the one measuring soil classifiction, common method adopts 4 samples usually, respectively under different pressure at right angles, apply horizontal shear force and shear, shear stress when trying to achieve destruction is then according to Coulomb's law determination soil classifiction parameter internal friction and cohesive strength.
Direct shear test have cut soon, three kinds of methods such as consolidated quick shear, slow shear, no matter be triaxial machining or conventional direct shear test, all require to gather undisturbed soil sample at the scene, then test under different pressure, drainage condition and environment, with determine the soil body, value indoor direct shear test manual control shear surface, and drainage condition be also difficult to control, stress state and soil body natural conditions are had greater difference, and require more due to sample, be difficult to ensure that one of soil sample state makes peace evenly.
Said method also also exists Local topography and fetches earth, and it is too small that soil sample is cut face, the weakness that result " is fanned out from point to area ".
Summary of the invention
For prior art Problems existing, 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 can the test of multiple spot different depth, be applicable to the multiple soil body, obtain stress-strain curve and the parameter 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 Cylinders, is arranged on described steelframe;
Cylinder, can be arranged on the clutch end of described Vertical Cylinders with moving horizontally;
Cross cylinder, is arranged on described steelframe;
Push away bowl, be arranged on the clutch end of described cross cylinder, for applying the thrust of level to described cylinder, and make described cylinder move predetermined distance;
Wherein, described cross cylinder is also provided with the displacement transducer for measuring displacement and the first pressure transducer for measuring thrust, described Vertical Cylinders is also provided with the second pressure transducer for measuring side pressure.
The present invention uses Vertical Cylinders and cross cylinder progressively applying level and vertical load automatically, utilizes shearing experiment to obtain soil body cohesive strength, angle of internal friction standard value, pressure-deformation curve, and test instrument test is accurate, flexible operation, reliable results.
Accompanying drawing explanation
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 Cylinders 2, cross cylinder 3 and cylinder 4.Vertical Cylinders 2 is arranged on steelframe 1, and cylinder 4 can be arranged on the clutch end of Vertical Cylinders 2 by horizontal slide rail 12 with moving horizontally; Cross cylinder 3 is arranged on steelframe 1; Push away the clutch end that bowl 11 is arranged on cross cylinder 3, for applying the thrust of level to cylinder 4, and make cylinder 4 move predetermined distance, to shear the soil body outside the soil body in cylinder 4 and cylinder 4.
In addition, cross cylinder 3 is also provided with the displacement transducer 6 for measuring land movement and the first pressure transducer 7 for measuring thrust suffered by the soil body, Vertical Cylinders 2 is also provided with the second pressure transducer 8 for measuring soil body simulation side pressure.
The data that above-mentioned displacement transducer 6, first pressure transducer 7 and the second pressure transducer 8 are measured are transferred to processing unit 10 Storage and Processing.Vertical Cylinders 2 and cross cylinder 3 are controlled by hydraulic pump 9.
In addition, the video camera (not shown) cutting process for taking whole soil in-situ ring can also be set on steelframe 1.
When the present invention uses,
1) cylinder of steel of higher stiffness is selected to be used for test experience;
2) in tank, the simulation soil body is filled;
3) hydraulic cylinder is by cylinder 4 vertically press-in below soil body 10mm;
4) manually around mamoty is gone out;
5) cross cylinder 3 drives and pushes away bowl 11 pairs of cylinders 4 and exert a force, because the soil body in the guide effect cylinder 4 of horizontal slide rail 12 and bulk soil body faying face are only by pure shear, cross cylinder 3 outwards stretches with the speed of the every 100 seconds 1mm that advance, real-time sampling monitoring, record acting force and displacement relation, until soil body shear failure, obtain the parameter such as cohesive strength, angle of internal friction.
6) on test instrument, visual device is recorded pressure pin stretching, extension and is shunk return, centering block rotation merging and load applying and test overall process, reaches whole process of the test visual.
In-situ direct shear test of the present invention carries out at the scene owing to testing, there is not the slight perturbations of transport, also the change of water cut can not be there is, the native state of soil structures can be kept to greatest extent, ensure that the stress state of the soil body does not change, and its stress path also can be determined according to engineering practice, thus comparatively shop experiment more can meet native state.
In addition, the present invention can also apply horizontal thrust along glide direction, and shear surface directly can be fixed on sliding surface and shear, and shear area is comparatively large, representative, so Situ Computation truly can 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 large source of measuring error, systematic measurement error largely depends on operant level and the ability of experiment of experimenter, in order to improve the experimental enviroment of in-situ test, reduce personal error.By hydraulic pump 9, progressively applying vertical load compresses the soil body downwards automatically, utilizes Stress and displacement Sensor monitoring earth stress and distortion, and automatic collecting test data storing, record the plasticity of each soil layer, breakdown strength parameter; On test instrument, visual device is recorded pressure pin and is stretched and load applying and test overall process, reaches whole process of the test visual.
Claims (1)
1. a soil in-situ direct shear test instrument, is characterized in that, comprising:
Steelframe;
Vertical Cylinders, is arranged on described steelframe;
Cylinder, can be arranged on the clutch end of described Vertical Cylinders with moving horizontally, described cylinder vertically can be pressed into the soil body by described Vertical Cylinders;
Cross cylinder, is arranged on described steelframe;
Push away bowl, be arranged on the clutch end of described cross cylinder, for applying the thrust of level to described cylinder, and make described cylinder move predetermined distance;
Wherein, described cross cylinder is also provided with the displacement transducer for measuring displacement and the first pressure transducer for measuring thrust, described Vertical Cylinders is also provided with the second pressure transducer for 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 |
Publications (2)
| Publication Number | Publication Date |
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| CN103234839A CN103234839A (en) | 2013-08-07 |
| CN103234839B true CN103234839B (en) | 2016-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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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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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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) |
| 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 |
| CN103806906B (en) * | 2014-01-26 | 2016-09-14 | 北京雷雨达科技有限公司 | Rock/upper boring in-situ testing device and method |
| 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 |
| 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 |
| CN114034580B (en) * | 2019-01-25 | 2022-08-19 | 安阳师范学院 | Fiber-reinforced recycled brick aggregate concrete shear test device and method |
| 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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| CN102042937A (en) * | 2009-10-14 | 2011-05-04 | 同济大学 | Site large-scale direct shearing test device of shearing strength of concrete and basement adhesion surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004257892A (en) * | 2003-02-26 | 2004-09-16 | Sumitomo Rubber Ind Ltd | Snow characteristic measuring apparatus |
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2013
- 2013-04-24 CN CN201310145305.7A patent/CN103234839B/en active Active
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| CN101105433A (en) * | 2007-07-26 | 2008-01-16 | 河海大学 | Portable on-spot and indoor dual-purpose direct-cutting experiment instrument and its sampling method |
| CN201083668Y (en) * | 2007-10-10 | 2008-07-09 | 中国科学院武汉岩土力学研究所 | Rock double-linkage three axis rheogeniometer |
| CN102042937A (en) * | 2009-10-14 | 2011-05-04 | 同济大学 | Site large-scale direct shearing test device of shearing strength of concrete and basement adhesion surface |
| CN201803909U (en) * | 2010-08-16 | 2011-04-20 | 黄河勘测规划设计有限公司 | Borehole direct-shear testing equipment for rock sample preparation |
| CN102564869A (en) * | 2011-12-29 | 2012-07-11 | 浙江土工仪器制造有限公司 | Shearing tester |
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| CN103234839A (en) | 2013-08-07 |
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