走向断层影响下工作面采动应力演化规律

Evolution Law of Mining Stress in Working Face under Influence of Strike Fault

为研究工作面受断层影响时采动应力演化规律,以某煤矿201工作面为研究对象,采用数值分析和现场监测相结合的研究方法,对其进行了系统地研究。结果表明:沿201工作面倾向,断层远离工作面时,上盘断层侧应力值高于下盘,下盘断层侧为卸荷区;断层靠近工作面时,上盘断层侧应力值远小于下盘,上盘断层侧为卸压区。断层的存在阻隔了覆岩应力的连续传递,破坏了正常的应力传递路径。沿工作面倾向支架工作阻力区域性特征明显。当断层靠近工作面时,靠近回风巷侧(断层侧)支架阻力偏大,中部次之,靠近运输巷侧最小。模拟结果与监测结果一致。

In order to study the evolution law of mining stress when the working face is affected by faults,the 201 working face of a coal mine is taken as the research object,and the research method combining numerical analysis with on-site monitoring is used to systematically study it.The results show that along the dip of 201 working face,when the fault is far away from the working face,the stress value of the upper wall fault side is higher than that of the lower wall,and the lower wall fault side is the unloading area;When the fault is close to the working face,the stress value of the upper wall fault side is much smaller than that of the lower wall,and the upper wall fault side is the pressure relief area.The existence of faults blocks the continuous transmission of overlying strata stress and destroys the normal stress transmission path.The regional characteristics of working resistance of inclined support along the working face are obvious.When the fault is close to the working face,the support resistance near the return air roadway(fault side)is larger,followed by the middle,and the smallest near the transportation roadway.The simulation results are consistent with the monitoring results.