基于微地震监测的覆岩多层空间结构倾向支承压力研究

STUDY ON ABUTMENT PRESSURE RULE OF OVERLYING STRATA SPATIAL STRUCTURES BASED ON MICROSEISMIC MONITORING

随着开采深度的不断增加,矿山动力灾害日趋严重,采场周围岩(煤)体变形失稳是顶底板突水、煤与瓦斯突出、冲击地压(岩爆)等矿山动力灾害发生的根本原因,而岩层运动范围扩展后深部采场的采动应力场分布规律研究是解决上述问题的理论基础。将采场上方直至地表的岩层视为采场上方的覆岩空间结构,基于微地震监测结果,针对倾斜煤层,圈定采场覆岩多层空间结构的范围,研究覆岩空间结构岩层运动发展规律,并建立覆岩空间结构下的采场倾向支承压力计算模型。利用力学方法,针对倾斜煤层研究倾向支承压力的动态分布规律和计算方法,得到了倾向支承压力的计算公式;利用上述计算方法,研究了华丰矿1410工作面倾向支承压力分布规律,并与现场1410工作面微地震监测结果所揭示的倾向支承压力分布进行了对比分析。研究结果表明,上述方法适用于深部采场岩层运动范围扩展后的、倾斜煤层倾向支承压力的定量化估算和预测。

As the mining depth increases,many hazards related to the deep overburden collapse such as pressure bump,coal and gas burst will appear,which are caused by the movement of overlying strata. A study of the abutment pressure rule of overlying strata spatial structures is the theoretical basis of controlling the hazards. In this paper,the overlying strata from longwall face to the Earth′s face as multilayer spatial structures are considered. Based on microseismic monitoring,the movement rules of multilayer spatial structures are studied and the computing models of abutment pressure are set up. The rule of abutment pressure is also analyzed and the computation formulae are gained by using the elasticity theory. The computation results are compared with the results of field microseismic monitoring. Field experiments in Huafeng coal mine show clearly that this method is useful for the prediction of abutment pressure and can provide accurate theoretical basis for controlling the mining hazards caused by the movement of overlying strata.