Ultra-large-breadth continuous-size rock mass structural plane shear strength test system

Abstract

The invention discloses an ultra-large-breadth continuous-size rock mass structural plane shear strength test system. A tangential combined loading mechanism and a sample reset device are located on the two sides of a frame, and the loading position of the tangential combined loading mechanism is an upper sample close to a fracture surface; any lower sample with different breadths is fixed right above the transport trolley before testing, the left side of the sample is uniformly located at a set position close to the tangential combined loading mechanism, and the sample reset device resets inthree modes according to the breadth size of the sample. The normal combined loading mechanism is mounted on a frame cross beam, a normal loading position can be set in the tangential loading direction, and a corresponding number of normal and tangential actuators are automatically selected according to the load requirement and breadth of the upper test sample for combined cooperative loading; andthe lifting mechanism is installed on the upper portion of the cross beam and can move in the tangential loading direction so as to achieve lifting and installation of the thin upper sample or the auxiliary device. The device effectively meets the requirement for same-precision shear strength size effect research under large-range loads and is good in reliability.

Description

technical field [0001] The invention relates to a shear strength test system of a rock mass structural surface with a super large width and continuous size. Background technique [0002] Under the same test conditions, as the size of the rock sample changes, some properties such as shear strength will change, that is, the size effect phenomenon is a common feature in rock mechanics. In order to study the size effect of the structural plane shear strength of a continuously adjustable width rock mass, it is necessary to use a size effect test system to complete the direct shear test of the rock from thin specimens to ultra-long width specimens, which needs to meet the width Equipment function requirements such as installation, loading and reset of continuously debuggable samples. [0003] Among the currently developed rock size effect direct shear test equipment, Du Shigui proposed a rock mass discontinuity plane shear strength size effect test machine (CN201410149668.2) and ...

AI Technical Summary

Problems solved by technology

However, the existing equipment and patent content cannot solve the problem that the upper sample with a wide range of continuously adjustable width moves under the action of tangential load and causes the problem of eccentricity of the normal load, especially when the moving distance of the upper sample is too large to exceed The condition of the width of the actuator loading plate; it cannot be solved that the tangential loading position of the sample with the same width size is always within the loading surface of the sample when the large-scale load is required, especially the width of the sample only allows one actuator loading position conditions; it cannot meet the vibration and product service life problems during the loading process caused by the long stroke of the piston rod of the tangential actuator when the upper sample is too long under the action of tangential force; it cannot meet the installation test of thin samples, Security protection and reset issues

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