煤与瓦斯突出临界状态的数值模拟与实验研究

Numerical simulation and experimental research for critical state of coal and gas outburst

为探究煤与瓦斯突出规律,通过DDTS-500煤岩监测系统实验研究煤与瓦斯突出过程,分析其突出临界范围。在实验数据的基础上,利用PFC^2D软件数值模拟煤样在突出临界状态下瓦斯压力变化和煤样内部裂隙变化。结果表明:在瓦斯压力1.8~2.0MPa时实验煤样发生煤与瓦斯突出现象;突出临界时的内部裂隙主要集中在临空面一侧,呈弧形向内部发育。该研究为煤矿突出危险区临界数据监测预警提供参考。

This paper aims to explore the law underlying coal and gas outburst.The study building on a series of experiments of DDTS-500 coal and rock monitoring system involves investigating how coal and gas outburst occur,analyzing the range of its critical state,and numerically simulating the changes in gas pressure and the internal cracks of the coal-sample,based on the experimental data and using the PFC 2D software.The study shows that coal and gas outburst occurs in experimental coal samples with gas pressure of 1.8-2.0 MPa.The internal cracks at the critical state mainly concentrated on the side of the free surface tend to develop in an arc shape toward the center.This study could serve as a reference for monitoring and alarming the critical state of coal outburst hazardous zones.