大倾角煤层多重扰动煤巷围岩应力分布规律

Stress distribution law of complex high-stress roadway in large dipping seam

基于山西大远煤业有限公司1202工作面运输平巷大倾角煤层赋存条件,本文利用FLAC^(3D)数值模拟软件,分析巷道在采空区侧向支承压力与超前支承压力叠加作用下的应力分布规律;基于应力分析结果,提出合理的区段煤柱宽度。研究结果表明:在叠加压力作用的强烈影响下,巷道围岩应力呈非对称分布特征,帮部集中应力与煤层底板侧向支承压力峰值影响范围贯通;侧向支承压力成为导致工作面超前支承压力非对称分布的主要因素,两者产生强烈应力叠加效应,形成典型多重扰动叠加应力环境;考虑减小巷道围岩应力非对称程度,以及煤柱与顶板和底板岩层的滑移破坏,建议山西大远煤业有限公司大倾角煤层区段煤柱宽度取值范围为6~12 m。

Based on the occurrence conditions of large dipping seam in 1202 working face of Shanxi Dayuan Coal Industry Co.,Ltd.,this paper analyzes the stress distribution law of roadway under the superposition of lateral abutment pressure and advanced abutment pressure in goaf by using FLAC^(3D) numerical simulation software;based on the stress analysis results,reasonable section coal pillar width is proposed.The results show that under the strong influence of superimposed pressure,the surrounding rock stress of roadway is asymmetric distribution,and the influence range of side concentrated stress is connected with the peak value of lateral abutment pressure of coal seam floor;the lateral abutment pressure becomes the main factor leading to the asymmetric distribution of advance abutment pressure in working face,and both of them produce strong stress superposition effect and form typical multiple disturbance superimposed stress environment.In order to reduce the stress asymmetry degree of roadway surrounding rock,and considering the sliding failure of coal pillar,roof and floor strata,it is suggested that the width of coal pillar in large dipping seam section of Shanxi Dayuan Coal Industry Co.,Ltd.should be 6-12 m.