A torsional shear test device and method for undisturbed samples of soil-rock interface

Abstract

A torsional shear test device for undisturbed samples of soil-rock interface, comprising a bearing frame, a sample fixing unit is arranged in the bearing frame, a normal stress loading unit is arranged above the sample fixing unit, and a circumferential direction is arranged on the side of the sample fixing unit Shearing unit; the sample fixing unit includes a sleeve, a sample, and a rock slab, wherein the sample is placed in the sleeve, the sleeve is placed above the rock slab, and the fixed shaft at the bottom of the bearing frame passes through the rock slab, the sleeve The normal stress loading unit includes a force transmission plate, a jack, a pressure sensor and a backing plate sequentially arranged above the sleeve; the hoop shearing unit includes a Worm gear mechanism. The patent of the present invention provides a torsional shear test device for undisturbed samples at the soil-rock interface, which can perform torsional shear tests on undisturbed samples and avoid uneven distribution of shear stress on the shear plane.

Description

technical field [0001] The patent of the present invention relates to a soil-rock interface torsional shear device and its use method. Specifically, it relates to the torsional shear test of the soil-rock interface original sample in the technical field of geotechnical engineering testing. Shear strength test. Background technique [0002] In geotechnical engineering, shear failure is one of the main forms of soil and rock failure and deformation, which is basically caused by shear failure. The instability and failure of geotechnical engineering are accompanied by the development of shear displacement. develop. At the same time, in actual engineering, many accumulation landslides are shear sliding along the soil-rock contact surface. Therefore, it is necessary to carry out experimental research on the shear performance of the soil-rock contact surface. [0003] How to quickly obtain accurate and objectively reflect the actual shear strength parameters through tests has bec...

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Problems solved by technology

[0004] The technical problem to be solved by the patent of the present invention is to provide a torsional shear test device and method for the undisturbed sample of the soil-rock interface, to overcome the problems of the soil-rock shear plane gradually shrinking and stress concentration during the direct shear test of the soil-rock interface, and to provide a Torsional shear device for undisturbed sample of soil-rock interface integrating normal stress loading and circumferential shearing and its application method

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