基于FLAC数值模拟的工作面向采空区推进应力分布特征  

Distribution characteristics of advancing stress in working face goaf based on FLAC numerical simulation

作　　者：陈润合 肖佳琦 牛佳胜 李成海 吕国伟 巩思园[3] CHEN Run-he;XIAO Jia-qi;NIU Jia-sheng;LI Cheng-hai;LYU Guo-wei;TIAN Xin-yuan(Dongxia Coal Mine of Huating Coal Industry Group Co.,Ltd.,Huating 744199,China;Xuzhou Hongyi Science and Technology Development Company Limited,Xuzhou 221008,China;China University of Mining and Technology,State Key Laboratory of Coal Resources and Safe Mining,Xuzhou 221116,China)

机构地区：[1]华亭煤业集团有限公司东峡煤矿,甘肃华亭744199 [2]徐州弘毅科技发展有限公司,江苏徐州221008 [3]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《煤炭科技》2022年第5期89-94,102,共7页Coal Science & Technology Magazine

基　　金：国家自然科学基金项目(51874292)。

摘　　要：为解决矿井内工作面向采空区推进期间冲击危险的难题,分析采场侧向支承应力以及采空区的冲击危险影响程度,采用数值模拟方法建立数值模型,分别对工作面开采前邻近采空区的应力分布特征、工作面开采时向采空区推进不同距离下应力分布及演化规律进行分析。研究结果表明,工作面向采空区推进距离大于175 m时,停采线两侧的应力峰值降低且趋于稳定,冲击危险程度降低。为提高煤炭回收率,在采取有效的冲击地压监测及防治的基础上,可将175 m作为工作面回采末期布置设计停采线的参考距离。In order to solve the problem of impact hazard during the working face advancing towards the goaf in the mine,the lateral abutment stress of the stope and the impact hazard degree of the goaf are analyzed.The numerical simulation method is used to establish the numerical model,and the stress distribution characteristics of the adjacent goaf before the working face mining and the stress distribution and evolution law of the working face advancing towards the goaf at different distances are analyzed.The results show that when the working face advancing distance is greater than 175 m,the peak stress on both sides of the stop line decreases and tends to be stable,and the impact risk is reduced.In order to improve the coal recovery rate,on the basis of effective rock burst monitoring and prevention,175 m can be used as the reference distance for the design of stopping line at the end of mining.

关 键 词：工作面 采空区 数值模拟 应力分布 冲击危险 

分 类 号：TD324[矿业工程—矿井建设]