侧向支承应力作用下6.0m小煤柱巷道加固技术研究

Reinforcement of 6.0m coal pillar roadway under lateral bearing stress

为了解决塔山煤矿三盘区6.0m小煤柱巷道围岩稳定性控制难题,利用数值模拟与现场实测研究相结合的方案,对8311工作面回采过程中煤柱应力的变化规律和侧向支承应力作用下小煤柱巷道加固技术进行了研究,提出了对穿锚索加固小煤柱配合顶板支护方案,有效的降低了6.0m小煤柱巷道的围岩控制技术难度。数值模拟研究表明,随工作面与测站相对位置变化,小煤柱先后承受超前支承应力与侧向支承应力作用,煤柱应力逐渐增大。通过现场工业性试验,采用对穿锚索加固小煤柱配合顶板支护方案后,巷道中央顶板的最大收敛量为241 mm,两帮移进量最大为521 mm,能够满足巷道服务期间的安全生产要求。研究结果表明,采用对穿锚索加固小煤柱配合顶板支护方案,解决侧向支撑压力作用下小煤柱巷道的维护难度是可行的。

Aiming at the difficulty in surrounding rock stability control of the 6.0m small coal pillar roadway in the third panel of Tashan Coal Mine,a scheme combining numerical simulation and on-site measurement is proposed to investigate the change law of coal pillar stress and lateral bearing stress during the mining of the 8311 working face,and study the roadway reinforcement technology under the action of small coal pillar.A supporting scheme is proposed,using two-ended cables to reinforce the small coal pillars thus to supplement the roadway roof support,which significantly simplifies the control of 6.0m small coal pillar roadway.The numerical simulation shows that as relative position of the working face and measuring station changes,the small coal pillars are subjected to the advance bearing stress and the lateral bearing stress successively,and the coal pillar stress gradually increases.In the on-site industrial tests,the maximum convergence of the central roof of the roadway is 241mm,and the maximum convergence of the two side walls is 521mm,which can meet the production safety requirements of the roadway service after the supporting scheme is adopted,feasibility of the proposed supporting scheme using two-ended cables to reinforce the small coal pillars and supplement the roadway roof support is proposed.