原岩应力和构造应力耦合型矿震发生机理研究

Study on Occurrence Mechanism of Mine Earthquake Caused by Coupling of Original Rock Stress and Tectonic Stress

针对山东某煤矿首采工作面出现的矿震异常现象,通过现场数据统计和理论分析,探明了该矿矿震为原岩应力与构造应力耦合型。基于应力和能量转移原理,提出了该矿矿震的发生机理为两种应力的耦合,并建立了原岩应力"破坏-重塑"后与断层构造应力叠加的物理模型;为确立合理的工作面开切眼位置,推导出了此类型矿震发生的判断准则,最终建立了原岩应力破坏、应力场演化和断层活化失稳诱发矿震之间的相互作用关系。

On the basis of the abnormal phenomena of mine earthquake in the first mining face of a coal mine in Shandong province,through field data statistics and theoretical analysis,it was found that the mine earthquake was caused by coupling of original rock stress and tectonic stress.Based on transfer principles of stress and energy,it was proposed that the occurrence mechanism of mine earthquake was caused by the coupling of two kinds of stresses.And the physical model of superposition of fault tectonic stress with original rock stress after failure and remodeling was established.In order to establish a reasonable cut position in working face,the judgment criterion for the occurrence of mine earthquake was deduced.Finally,the interaction relations were established among the original rock stress failure,the stress field evolution,and fault activation and instability with induced mine earthquake.