Research on instability mechanism of coal and rock "shock bump-rock burst" dynamic system

doi:10.16265/j.cnki.issn1003-3033.2017.04.026

Abstract

Abstract: For effective provention and mitigation of rock burst induced by shock bump, a model was built for the coal and rock "shock bump-rock burst" dynamic system based on the relationship between rock burst and shock bump. The mechanism of rock burst induced by shock bump and its instability criterion were analyzed on the basis of the model. The dynamic effects caused by thigh energy shock bumps near the working face were certified by numerical simulation. Corresponding control measures of rock burst induced by shock bumps were provided. The results show that the rock burst mechanism induced by shock bumps is that disturbance created by shock bump makes coal and rock stress reach the plastic softening stage instantaneously, the difference bigger between the accumulation energy of coal and rock and the consumption energy due to destruction, and a strong rock burst occurrs when the rigidity condition is satisfied. and that the danger of rock burst induced by shock bumps can be avoided or reduced greatlyby controlling separately shock bump sources, shock bump energy propagation path and rock burst sources.

Key words: shock bump, rock burst, "shock bump-rock burst", dynamic system, transmitting and dissipating, instability criterion, prevention and treatment from different sources

CLC Number:

X915.5
TD324

LYU Pengfei, CHEN Xuehua. Research on instability mechanism of coal and rock "shock bump-rock burst" dynamic system[J]. China Safety Science Journal, 2017, 27(4): 145-150.

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