Device and method for testing looseness of rock under disturbance of strain rate in loading process of pendulum bob

Abstract

The invention discloses a device and a method for testing looseness of rock under disturbance of a strain rate in the loading process of a pendulum bob. The device is suitable for testing the loosing performance of a rock test piece under the compression effect of axial static load (and confining pressure), a transmission bar on an axial pressure loading plate is driven by utilizing a worm and gear and adjusting a hand-operated rocking handle, and the loose test of the transmission bar on the test piece under the grading displacement loading and constant displacement condition can be realized; a stable axial static load (and confining pressure) can be applied by the device to the rock sample, and then the load is impacted by adjusting the pendulum bob so as to apply the axial power, so that the rock sample is broken, and the mechanical property of the rock after suffering the impact load at a long-term loosing state can be tested. By adopting the device and method, the mechanical response characteristics and damage mechanism of the rock under the long-term loosing effect and instantaneous dynamic disturbance effect can be studied, and an important theoretical significance on evaluating the stability of an underground digging space and designing a permanent support of an underground rock project can be realized.

Description

technical field [0001] The invention belongs to the technical field of rock rheology and dynamics, and in particular relates to a test device and method for rock relaxation under strain rate disturbance during pendulum loading. Background technique [0002] Stress rheological phenomena can be seen everywhere in rock mass engineering. For example, after some underground chambers, roadways, tunnels, etc. are excavated and supported, rocks will undergo rheological phenomena after a period of time, and these rheological phenomena often include rock creep and relaxation. . For the rheological rock mass, under the disturbance of the blasting load in the stope, the rheological effect will become more obvious, and accelerated rheology may occur, which may cause mine dynamic disasters. In particular, underground mining in deep mines is often faced with disasters such as rockburst, water inrush, large-scale roof pressure, and goaf instability. These phenomena all involve the combinat...

AI Technical Summary

Problems solved by technology

[0005] In terms of dynamic disturbance loading methods, the current dynamic disturbance rheology test device adopts detonation detonator explosion imp

Images