深井动压巷道群围岩应力分析及煤柱留设研究

Study on Surrounding Rock Stress and Reasonable Pillar of Mining Induced Roadway Groups in Deep Well

为了深入研究深井动压巷道群及其硐室围岩应力分布及其变形破坏特征,基于采动支承应力在煤层底板及前方的传递规律,采用FLAC数值模拟软件对不同开采条件下深部集中动压巷道围岩进行了模拟分析,结果表明深部集中巷道群在单侧工作面开采保留80m煤柱时,受采动影响不大.而两侧先后回采后,巷道群位于开采形成的孤岛煤柱内,受集中采动应力叠加影响,应力集中系数增大,巷道破坏程度加强,同时岩性的不同对巷道稳定性也有很大的影响.对于未采工作面提出了合理的煤柱尺寸,成功的指导了工程实践,为类似条件下的巷道群围岩控制和提高煤炭回收率具有借鉴和指导意义.

In order to study the stress distribution and deformation and damage characteristics of the dynamic pressed tunnel group and its chamber,based on the transfer law of mining-induced stress in the coal seam floor and in front of the working face,using numerical simulation software to simulate the surrounding rock stress of the dynamic pressed tunnel group under the different mining conditions.It is shown that the impact of mining of the deep concentration tunnel in the side of coal pillar 80m is not too serou...