采动影响下前方岩层支撑影响区数值模拟研究

Stratum forward Support Influence Area Numerical Simulation Research under Mining Influence

开采扰动影响下工作面前方上覆岩层将产生位移和应力的重新分布,针对这一问题,利用FLAC3D模拟软件模拟了工作面回采后煤壁前方的支撑影响区的范围。模拟结果表明,工作面推进距离超过60m后,支承压力影响区范围基本稳定,影响范围达采煤工作面前方85m左右,其中支承压力峰值应力在煤体前方约10m左右。通过对采动后工作面前方的瓦斯抽采效果考察,工作面前方实际支撑影响区的范围与数值模拟结果相吻合。

The displacement and the stress redistribution in front of the working face would occur in the overburden strata of the gob under mining disturbance, based on this problem, the simulation softwareFLAC3D was used to simulate the range of the support affected region in front of the coal wall after mining face. The simulation results showed that after advancing more than 60 m from the working face, the range of the support affected region basically stable, the area of influence reached 85 m in front of the working face. The support pressure peak stress in the coal front reach was about 10 m. By the effect of gas drainage study in front of the working face after mining, the real range of the support affected region coincided with the numerical results.