断层群影响下工作面冲击地压致灾机理研究  

Study on disaster mechanism caused by rock burst on working face under the impact of fault groups

作　　者：李成良 孙如达 LI Chengliang;SUN Ruda(Shenhua Xinjiang Energy Co.,Ltd.,CHN Energy Group,Urumqi 830000,China;CCTEG Coal Mining Research Co.,Ltd.,Beijing 100013,China)

机构地区：[1]国家能源集团神华新疆能源有限责任公司,新疆乌鲁木齐830000 [2]中煤科工开采研究院有限公司,北京100013

出　　处：《煤炭科技》2024年第4期134-140,共7页Coal Science & Technology Magazine

基　　金：中煤科工开采研究院有限公司科技创新基金项目(KCYJY-2022-QN-01)。

摘　　要：为了深入研究工作面开采扰动下过断层群时诱发冲击的致灾机理,选取屯宝煤矿M4-5煤层WII02040501工作面为研究对象,研究断层群在工作面开采扰动过程中对工作面冲击致灾机理的影响,采用数值模拟研究工作面过断层群时围岩应力和能量演化规律,结合PASAT探测煤体应力研究工作面过断层群区域时应力演化,得出工作面在断层群“多场”影响下的演化特征,揭示断层群区域的滑移失稳及冲击致灾机理。研究结果表明,工作面回采前、后断层群对工作面应力分布均产生明显影响,工作面过煤层群时应力及能量产生“卸压”效果,呈现出提前活化现象,当过大落差断层群时应力及能量升高产生突变现象,断层损伤整体呈现出“由上到下、由中间到两侧”的特点,冲击危险明显增大;结合现场PASAT实测得出断层对煤层应力集中程度影响明显,验证了冲击危险区域分布特征受断层群煤体应力集中程度影响较高,为工作面过断层群冲击地压灾害预测提供了理论指导。In order to deeply study the disaster mechanism induced by the impact of passing through fault groups under mining disturbance in the working face,the WII02040501 working face of the No.M4-5 coal seam in Tunbao Coal Mine was selected as the research object to study the influence of fault groups on the disaster mechanism of working face during the mining disturbance process.A numerical simulation was constructed to study the evolution law of surrounding rock stress and energy when the working face passes through fault groups.Combining PASAT detection of coal body stress to study the stress evolution of the working face when passing through the fault group area,the evolution characteristics of the working face under the influence of"multiple fields"in the fault group were obtained,revealing the sliding instability and impact disaster mechanism in the fault group area.The research results show that the fault groups before and after mining have a significant impact on the stress distribution of the working face.When the working face passes through the coal seam group,the stress and energy produce a"pressure relief"effect,showing a phenomenon of early activation.When the drop of the fault group is too large,the stress and energy increase and produce a sudden change phenomenon.The overall fault damage shows a characteristic of"from top to bottom,from the middle to both sides",and the risk of impact is significantly increased.Based on on-site PASAT measurements,it was found that faults have a significant impact on the stress concentration of coal seams,which verifies that the distribution characteristics of impact risk areas are highly affected by the stress concentration of fault group coal bodies.This provides theoretical guidance for predicting rock burst disasters in working faces passing through fault groups.

关 键 词：断层群 冲击地压 弹性应变能 防冲技术 地质构造 

分 类 号：TD324[矿业工程—矿井建设]