Airbag type soil-rock mixture in-situ compression shear test device

A technology of soil-rock mixture and test device, which is applied in the direction of using stable shear force to test the strength of materials, and can solve the problems of unsuitable, unsuitable soil-rock mixture, and large deviation.

Inactive Publication Date: 2009-12-02
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The existing in-situ shear test methods for soil and rock mass have gradually matured. The in-situ shear test is carried out by using a large jack with a corresponding rigid loading system, including large-area direct shear test, horizontal push shear test, The cross-plate shear test, etc., the direct shear test and the cross-plate shear test cannot be applied to the soil-rock mixture due to the presence of rocks in the soil-rock mixture, and the push-shear test is also affected by the formation of the sliding surface due to the c , The calculation

Method used

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  • Airbag type soil-rock mixture in-situ compression shear test device
  • Airbag type soil-rock mixture in-situ compression shear test device

Examples

Experimental program
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Embodiment Construction

[0013] 1. First apply a normal load to the normal jack 9 through the pressurized oil pump, and stop the pressurization after the pressure reaches the predetermined value, and then continue to pressurize unless the normal load drops significantly during the application of the shear load to the predetermined value;

[0014] 2. The air bag 1 is pressurized by an air pump, and the speed of pressurization is controlled so that the speed of the dial gauge remains basically constant. The barometer records a set of data every time it rotates about 50Kpa, including the pressure gauge reading of the air bag 1, the pressure gauge reading of the normal jack 9, and the pressure gauge reading of the lateral jack 3;

[0015] 3. When the reading of the airbag 1 pressure gauge reaches the maximum value and then the pressure gauge begins to drop, the sample 15 has been sheared and damaged, and the readings of each gauge at the peak value are recorded;

[0016] 4. Change the magnitude of the no...

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Abstract

The invention provides a special soil-rock mixture in-situ compression shear test device, which is characterized in that: according to the high anisotropy and discontinuity of a soil-rock mixture, shear load is applied onto a sample under variable normal load to obtain the shearing resistance property of the soil-rock mixture and the shearing plane of the soil-rock mixture can be formed freely. The shear load is applied by a method of soft loading, namely, a method of high pressure airbag pressurization. The device can actually reflect the forming process of the shearing plane in the soil-rock mixture and effectively improve the situation that the rigid application of the shear load leads to data results distortion. The device can perform shear tests of the soil-stone mixture and obtains test results highly reflecting actual situations.

Description

technical field [0001] Technical field of in-situ test of rock and soil mechanics Background technique [0002] The soil-rock mixture is mostly a loose accumulation body mixed with a piece of crushed stone. It is very difficult to take samples on-site for indoor testing. The in-situ testing has the advantage of being able to obtain shear strength and multiple mechanical parameters. The existing in-situ shear test methods for soil and rock mass have gradually matured. The in-situ shear test is carried out by using a large jack with a corresponding rigid loading system, including large-area direct shear test, horizontal push shear test, The cross-plate shear test, etc., the direct shear test and the cross-plate shear test cannot be applied to the soil-rock mixture due to the presence of rocks in the soil-rock mixture, and the push-shear test is also affected by the formation of the sliding surface due to the c , The calculation result of φ value deviates greatly compared with...

Claims

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Application Information

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IPC IPC(8): G01N3/24
Inventor 赫建明李晓李守定刘福莉
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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