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

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...

AI Technical Summary

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 result of φ value has a large deviation compared with the actual

Since the soil-rock mixture is a highly discontinuous body, there is a great inconsistency in the deformation and movement of the soil and the rock during the application of the shear load, which has caused the traditional rigid method of applying the shear load. Great influence on the results of in situ shear test

Therefore, the traditional in-situ shear test technology for a single soil or rock mass is not suitable for special engineering geological materials such as soil-rock mixtures.

Images