Portable restrictive double-sided shear strength test clamp and test method

Abstract

The invention belongs to the technical field of geotechnical engineering tests, and discloses a portable restrictive double-sided shear strength test clamp and test method. The test clamp comprises aclamp body, a shear block, two hinge brackets and two side pressure plates; a shearing groove penetrating the upper surface and the lower surface is formed in the clamp body in the vertical direction,a test piece groove which horizontally extends towards the rear end face and does not penetrate through the clamp body is formed in the front end face, the two side pressure plates are symmetricallyarranged on the two sides of the test piece groove, universal heads are fixedly arranged in the outer sides of the side pressure plates respectively, spherical cavities are formed in the universal heads, and small steering balls capable of rotating along the inner walls of the spherical cavities are arranged in the spherical cavities; the two hinge brackets are symmetrically arranged in the two sides of the clamp body; and the shear block is arranged in the shearing groove. The test clamp is simple in structure, the variable can be controlled only by replacing a test piece and a weight in thetest process, the test process is effectively simplified, and the test cost is greatly reduced.

Description

technical field [0001] The invention relates to a portable restrictive double-sided shear strength test fixture, which belongs to the technical field of geotechnical engineering test and construction engineering technology. Background technique [0002] Both engineering practice and laboratory tests have proved that shear failure is an important form of rock and soil failure, and the shear strength of rock and soil is related to the stability of geotechnical engineering. At present, the methods to determine the shear strength of rock and soil mainly include direct shear test, triaxial compression test and variable angle shear compression die test. Currently the most widely used is the variable-angle shear compression die test. This test method requires at least three sets of test fixtures for each test, and the fixtures need to be replaced manually during the test. The jig itself is sharp and heavy, which is easy to hurt the tester; when the angle of the jig is large, the j...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of cumbersome operation and low precision of the variable-angle shear compression die test in the existing geotechnical tests, the present invention provides a convenient restrictive double-sided shear strength test fixture, which converts variable-angle shear into direct shear Cutting, and no direct shear testing machine, only uniaxial compression testing machine can be carried out

Images