工作面末采段矿压规律及回撤通道支护优化研究

Study on ground pressure law in the final mining and support optimization of the withdrawal channel

煤矿工作面由于末采阶段回撤通道矿压规律不清,顶板控制不到位,往往导致回撤通道压架,减缓工程进度。本文以安山煤矿综采2006工作面回撤巷道为研究背景,采用理论分析以及数值模拟的方法对工作面末采段回撤通道煤柱平均应力、矿压规律以及回撤通道支护参数进行研究分析。研究结果表明,工作面末采段随着剩余煤柱不断减小,煤柱应力逐渐增大,剩余煤柱应力增幅也随之增大,受工作面超前支承压力影响越显著;工作面末采段超前支承压力影响范围19~28 m,其中强烈影响范围约为10 m,应力峰值位于工作面煤壁前方3~5 m处。结合安山2006综采工作面煤柱载荷及矿压规律分析结果,提出了回撤通道“锚索+锚杆”联合支护方案,模拟结果表明,回撤通道应力集中程度不大,最大主应力为3.1 MPa,帮部最大主应力为5.26 MPa,位于正前方中部区域,优化后的回撤通道支护方案控制效果较良好。

Due to the unclear ground pressure law of the withdrawal channel in the final mining and the insufficient roof control in the coal mining face,support crushing occurred in the withdrawal channel and slowed down the progress of the project.Taking the withdrawal roadway of No.2006 Face in Anshan Mine as the research background,the average stress of coal pillar,the law of ground pressure and the support parameters of the withdrawal channel in the final section of the working face were studied and analyzed by theoretical analysis and numerical simulation.The results showed that with the decrease of residual coal pillar in the end mining section of working face,the stress of coal pillar increased gradually,and the increase of residual coal pillar stress increased.The influence of advanced abutment pressure on working face was more obvious.The influence range of advanced abutment pressure in the end mining section of the working face was 19~28 m,and the strong influence range was about 10 m.The peak stress was 3~5 m ahead of the coal wall of the working face.Combined with the analysis results of coal pillar load and ground pressure law in No.2006 Face,the combined support scheme of'anchor cable+anchor bolt'in the withdrawal channel was proposed.The simulation results showed that the stress concentration of the withdrawal channel was not large,the maximum principal stress was 3.1 MPa,and the maximum principal stress of the side was 5.26 MPa,which was located in the middle area of the front.The optimized withdrawal channel support scheme had good control effect.