Direct shear testing device of saturated rock soil samples

Abstract

The invention discloses a direct shear testing device of saturated rock soil samples, which relates to the technology of mechanical strength test of rock soil. The structure of the direct shear testing device comprises a sample shear box, a loading system, a saturation system, a vacuum pump and a data acquisition system which are fixed on a frame to form a whole body, wherein the shear box is arranged in a water channel of the saturation system and guarantees the sample to be saturated completely, the loading system comprises a vertical loading system and a transverse loading system, the vertical loading system and the transverse loading system are respectively connected with the shear box and realize vertical loading and transverse loading of the shear box, the vacuum pump is connected with the saturation system and used for vacuumizing the closed water channel, and the data acquisition system is connected with the shear box and the loading system respectively and used for monitoring and recording the force and the displacement of the shear box. The direct shear testing device realizes direct shear tests of small-size and medium-size gravel soil, crack soil and soft rocks, and particularly can realize site tests of samples on the construction site and reciprocating direct shear tests of saturated rock soil.

Description

technical field [0001] The invention relates to rock and soil mechanical strength test technology, in particular to a direct shear test device for saturated rock and soil samples. Specifically, it involves the testing technology for the mechanical strength of small and medium-sized gravel, cracked soil and soft rock under unsaturated or saturated state; using this test device, it is convenient to test cohesive and non-cohesive rock and soil samples. After the device is saturated, the direct shear test of the saturated sample can be carried out, and at the same time, the device can be conveniently moved to the site to test the mechanical strength index of rock and soil in real time. Background technique [0002] Most of the instability in geotechnical engineering is caused by shear failure. Accurate determination of shear strength parameters of rock and soil is of great significance in geotechnical engineering construction. The instability and failure of geotechnical enginee...

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Problems solved by technology

Due to the poor water retention of gravel soil, the saturation of the sample cannot be accurately controlled by the water spraying method. Even after the sample is saturated, the water in the pores of the soil sample will be discharged under the action of gravity, and for large viscous cracks The vacuum saturation method for soil sample saturation is not suitable because the sample size is too large. Even after vacuum saturation, there are many difficulties in the installation of the sample, and there is no good solution so far.

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