Rock structural surface cyclic shearing device and test method of opposite-vertex clamping structure

Abstract

The invention discloses a rock structural surface cyclic shearing device of an opposite-vertex clamping structure, wherein the device comprises an upper shearing box and a lower shearing box, and further comprises an upper positive shearing loading jack and an upper negative shearing loading jack which are symmetrically arranged on two sides of the upper shearing box; the device also comprises a lower positive shearing loading jack and a lower negative shearing loading jack which are symmetrically arranged on the two sides of the lower shearing box, and a normal force sensor is arranged at the telescopic end of the normal loading servo jack and abuts against the top of the upper shearing box. The invention further discloses a rock structural surface cyclic shear test method of the opposite-vertex clamping structure; the test sample can be kept in a fastened state from the beginning to the end in a cyclic experiment, a shear test piece is prevented from shaking in the shear box in cyclic shear, and the test precision is improved.

Description

technical field [0001] The invention belongs to the technical fields of civil engineering, water conservancy and hydropower engineering, and new energy engineering, and specifically relates to a cyclic shearing device for a rock structural surface with a top clamping structure, and also relates to a cyclic shearing device for a rock structural surface with a top clamping structure experiment method. Background technique [0002] The shear characteristics of rock mass structural planes are very important for the stability evaluation of geotechnical engineering such as slope engineering and tunnel engineering. Key indicators for disease prediction and control. Shearing in the tangential direction of the structural plane, that is, direct shearing (direct shear) is the most commonly used test method for determining the structural plane of rock mass, and has been widely used. Furthermore, there are quite a lot of working conditions that need to measure the shear mechanical prop...

AI Technical Summary

Problems solved by technology

[0004] However, in practice, the structural surface sample cannot be closely matched with the shear box because of the manufacturing tolerance, so there is a lot of shaking during the shearing process. In order to avoid this problem, in some designs, the shear box A special design is adopted so that when the test piece is installed, the shear box can clamp the test piece, a typical example is (Zheng Bowen et al., a shear box for testing the cyclic shear characteristics of rock mass structural surfaces, application publication number CN 110411822A)

[0005] This design solves the problem of sloshing of the structural surface sample in the shear box due to manufacturing tolerances at the beginning of the test, but during the cyclic shearing process, the sample is compressed by the lateral shear force from the shear box , will inevitably produce lateral deformation, so that even if the sample is fastened before the test, after many cycles, the sample is still due to the lateral deformation (shortened by the side) Shake in the box, which affects the test accuracy

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