深井工作面向地垒构造开采煤岩体采动响应特征

Characteristics of mining response of deep well workings facing horst structures for coal rock mining

地垒构造为影响安全开采的重要因素,为分析工作面过地垒构造开采时两盘覆岩的运动规律及工作面前方支承应力的演化特征和断层活化规律,基于UDEC数值模拟软件进行研究。结果表明:工作面接近地垒构造时,上覆岩层向采空区发生回转,易引起断层活化滑移;工作面在地垒构造中,若煤体上方基本顶无法形成铰接结构,易引发断层煤柱失稳破坏煤体;由数值模拟可知,上盘工作面开采影响大于下盘工作面影响,其影响主要表现为断层冲击地压诱发影响开采范围大、断层滑移诱发冲击地压的危险性高。研究明确了地垒构造对地下工程作业的影响规律。

Horst structure is an important factor affecting safe mining.In this paper,the movement law of the two overburden rocks and the evolution characteristics of the support stress and fault activation law in front of the working face during overburden mining were analyzed by UDEC numerical simulation software.The results show that when the working face is close to the horst structures,the overlying rock layer will turn back to the goaf,which will easily cause the fault activation slip.If the basic roof above the coal body cannot form an articulated structure when the working face is in the horst structures,it is easy to trigger the destabilization of the faulted coal column to destroy the coal body.From the numerical simulation,it is known that the impact pressure induced by the fault in the upper working face mining affects the mining area more than that in the lower working face mining,and the risk of impact pressure induced by the fault slip is much higher than that in the lower working face mining.The study clarified the impact of horst structure on underground engineering operations.