基于微震裂缝参数反演的深部矿井“两带”结构规律  

"Two-zone"structure law in deep mines based on inversion of microseismic fracture parameters

作　　者：左秋玲[1] 李景山[2] ZUO Qiuling;LI Jingshan(College of Resources and Safety Engineering, Henan University of Engineering, Zhengzhou 451191, China;Public Security Department, Railway Police College, Zhengzhou 450053, China)

机构地区：[1]河南工程学院资源与安全工程学院,河南郑州451191 [2]铁道警察学院治安学系,河南郑州450053

出　　处：《河南工程学院学报（自然科学版）》2021年第2期29-33,42,共6页Journal of Henan University of Engineering：Natural Science Edition

基　　金：国家自然科学基金(51904089)。

摘　　要：微地震监测可以有效监测煤矿在采煤作业中裂缝事件的发育过程,探讨深部矿井采煤作业进程的微地震地质参数,能够有效确定煤矿放顶煤作业中断裂带与垮落带(“两带”)的发育高度。采用矩张量反演计算推导深部矿井在采煤作业中引起微地震事件的震源机制,在此基础上求解推导放顶煤采煤法诱发的“两带”裂缝事件点的地质特征参数。通过计算得到剪切型裂缝的方位角分布规律和深部矿井采煤工作面实测的应力分布,构建放顶煤采煤法下采煤工作面顶板的剪切型应力裂缝模型,分析微地震发展演化与“两带”活动规律,对解释采煤工作面的周期来压、“两带”边坡角、采煤工作面应力场的特征分布等重要理论问题和保证矿山安全生产具有重要意义。Microseismic monitoring system can effectively monitor the development of fracture events in coal mines during coal mining operations.Exploring the microseismic geological parameters of coal mining operations in deep mines can effectively determine the fault zones and collapse zones in top coal caving operations("two-zone").In this paper,the inversion calculation of moment tensor is used to derive the focal mechanism of microseismic events caused by deep mines during coal mining operations.On this basis,the geological characteristic parameters of the"two-zone"fracture event points induced by the top coal caving method are derived.Based on the calculated azimuth distribution of the shear fractures and the measured stress distribution in the deep coal mining face,a shear stress crack model for the roof of the coal mining face under the top coal caving method is constructed.The development and evolution of microseisms and the laws of the"two-zone"are analyzed.It is of great significance to explain important theoretical issues such as the periodic pressure of the coal mining face,the slope angle of the"two-zone",and the characteristic distribution of the stress field of the coal mining face.

关 键 词：微地震 矩张量 震源机制 断裂带 垮落带 

分 类 号：P631[天文地球—地质矿产勘探]