A vertical direct shear test device

Abstract

The invention discloses a vertical direct shear test device. The vertical direct shear test device comprises a base, a water injection pipe and a water drainage pipe, wherein a pressure chamber is arranged on the base, an upper cover of a shear chamber is arranged on the pressure chamber, a rubber membrane sleeve is arranged in the pressure chamber, the lower end of the rubber membrane sleeve is arranged on the base, the lower end of the rubber membrane sleeve is hermetically connected with the base, an upper shear box and a lower shear box are arranged in the rubber membrane sleeve, the upper and the lower shear boxes are respectively positioned at the upper end and the lower end of the rubber membrane sleeve, a test sample cavity is surrounded by the rubber membrane sleeve and the upper and the lower shear boxes, the upper and the lower shear boxes adopt shear components, each shear component comprises a substrate, the substrates are respectively provided with a shear block and a deformation block, the opposite planes of the shear block and the deformation block are coplanar with the shear plane of a test sample, water grooves are arranged on the opposite planes of the shear block and the deformation block, the water grooves extend to the substrates and penetrates the substrates, water through holes are formed, the water injection pipe is connected with the water through hole in the upper shear box, the water drainage pipe is connected with the water through hole in the lower shear box, a top cap is arranged on the upper shear box, and the top cap is provided with a vertical loading shaft.

Description

technical field [0001] The present invention relates to the test and testing part in the field of rock and soil mechanics and geotechnical engineering, in particular to a vertical direct shear test device, which is suitable for rock and soil fundamentals of homogeneous soil samples and soil-rock mixture samples with cementation strength. The test of mechanical parameters and the test of rock and soil mechanical parameters under the action of water seepage on the sliding surface, especially the test of the strength index of the shear surface of the sample under the condition of water seepage; in addition, it can also be used for the seepage test of the crack surface of rock and concrete. Background technique [0002] In the field of geotechnical engineering, shear failure of rock and soil is a common form of failure, and after the shear surface is formed, the strength index and mechanical properties of the shear surface are important indicators for calculating stability. Dire...

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Problems solved by technology

[0005] In particular, for soil-rock mixed media cemented by granular media, the difference in particles and the complexity of the shear plane have a great influence on the shear strength of the shear plane, and there is no provision for the shear strength test of this type of media in the current test regulations , therefore, the development of a direct shear test method that considers the permeability of the slippery surface has good engineering practice value

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