煤层夹矸赋存区应力分布特征及微震活动规律  

Characteristics of stress distribution and microseismic activity in rock parting occurrence area

作　　者：宋解放 陆菜平[1] 李振武 欧阳广臣 曹先敏 周法乐 SONG Jiefang;LU Caiping;LI Zhenwu;OUYANG Guangchen;CAO Xianmin;ZHOU Fale(School of Mines,China University of Mining and Technology,Xuzhou 221116,China;Yunhe Coal Mining,Jining Energy Development Group Co.,Ltd.,Jining 273500,China)

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116 [2]济宁能源发展集团运河煤矿有限责任公司,山东济宁273500

出　　处：《采矿与岩层控制工程学报》2021年第4期116-124,共9页Journal of Mining and Strata Control Engineering

基　　金：国家自然科学基金面上资助项目(51574225)。

摘　　要：夹矸赋存破坏了煤层的连续性,不仅影响了工作面的采出率,而且在采动压力作用下夹矸较易发生滑移失稳。为了保证采煤工作的安全高效,以运河煤矿C5301含厚层夹矸工作面为例,分析了动-静载条件下煤层夹矸赋存区围岩应力分布特征及微震活动规律。研究表明:含夹矸工作面煤壁前方会形成“双峰值”应力区,即超前支承压力区与夹矸厚度变化形成的低支承压力区,通过分析不同条件下煤壁前方“双峰值”支承压力不均匀叠加前后应力增幅趋势,从而预测工作面回采过程中应力集中情况,同时分析了坚硬顶板破断产生的冲击动载对夹矸厚度变化区剪切应力的影响,根据现场微震事件时域分布及动力响应特征验证了研究内容的合理性。通过对含夹矸煤层的应力分布特征规律进行深入研究,为含夹矸工作面冲击地压防治提供了参考。The occurrence of rock gangue destroys the continuity of the coal seam,which not only affects the mining rate of the working face,but also is prone to slip and instability under the action of mining pressure.In order to ensure the safety and efficiency of coal mining,this paper takes the C5301 thick rock parting working face of Yunhe Coal Mine as an example,analyzed the stress distribution and microseismic activity law of coal seam rock parting occurrence area under the dynamic and static load conditions.The research shows that a"double peak"stress zone will be formed in front of the coal wall-the advance abutment pressure area and low abundant pressure area with the change of rock parting thickness.By observing that the bearing pressure uneven increasing in the"double peak"stress with the trend before and after the superposition is used to obtain the stress concentration of the working face during the mining process.At the same time,the impact of dynamic load generated by the fracture of the hard roof on the shear stress in the change area of the rock parting thickness is analyzed.Through the time-domain distribution of on-site microseismic events and the dynamic response characteristics show the correctness of the research content.The content of the research conducted an in-depth study on the stress evolution law of in rock parting occurrence area,and provided a reference experience for the prevention and control of rock bursts in working faces without gangue.

关 键 词：冲击地压 夹矸 应力分布 微震 

分 类 号：TD32[矿业工程—矿井建设]