深部不规则孤岛煤柱区冲击地压机理及防治  

Mechanism and prevention of rock burst in deep irregular isolated coal pillar

作　　者：薛成春 曹安业 牛风卫 王学渊 沈志平[3] 唐坤 XUE Chengchun;CAO Anye;NIU Fengwei;WANG Xueyuan;SHEN Zhiping;TANG Kun(Key Laboratory of Deep Coal Resource Mining Ministry of Education,School of Mines,China University of Mining and Technologyr Xuzhou,Jiangsu 221116,China;Madaotou Coal Industry Co Ltd,Datong Coal Mine Group,Datong,Shanxi 037003,China;Yaoqiao Coal Mine,Shanghai DatunEnergy Co Ltd,Xuzhou,Jiangsu 221611,China)

机构地区：[1]中国矿业大学矿业工程学院,深部煤炭资源开采教育部重点实验室,江苏徐州221116 [2]大同煤矿集团马道头煤业有限责任公司,山西大同037003 [3]上海大屯能源股份有限公司姚桥煤矿,江苏徐州221611

出　　处：《采矿与安全工程学报》2021年第3期479-486,共8页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51674253);江苏省基础研究计划(自然科学基金)面上项目(BK20171191)。

摘　　要：针对某矿中央采区深部不规则孤岛煤柱区冲击地压防治问题,基于理论分析、数值模拟、现场实践等方法对煤柱区冲击地压机理进行研究,制定煤柱区煤岩强度弱化减冲方案。基于煤柱区空间覆岩结构特征,辨识不同煤柱尺寸下煤体支承压力分布形态,揭示深部不规则孤岛煤柱区煤体失稳冲击机理。研究表明,孤岛煤柱区在竖向剖面上为非对称"T"型覆岩结构,煤体应力多呈不对称"马鞍形"分布,煤柱为"高应力不规则孤岛煤柱";模拟结果显示孤岛煤柱区支承压力呈不对称分布,煤柱区垂直应力峰值随工作面采空持续升高且逐渐向采区深部转移;制定煤柱区顶板深孔爆破、煤体大直径钻孔卸压的动静载力源降载释能防冲方案,降低了不规则煤柱区煤岩体应力水平,有效避免了深部不规则煤柱区冲击地压的发生。In view of prevention and control of rock burst of irregular isolated coal pillar in the central mining area of some mine, the mechanism of pillar burst was studied through theoretical analysis,numerical simulation, and field practice, and the rock burst control scheme of coal and rock mass strength weakening in coal pillar area was put forward. The distribution of abutment pressure under different coal pillar sizes was identified, and the rock burst mechanism of deep irregular isolated coal pillar was revealed based on spatial structure characteristics of overburden. The results have shown that the overburden structure of isolated coal pillar takes asymmetric "T" shape in vertical section, and coal pillars are "high stress irregular isolated ones" with asymmetric "saddle-shaped" stress distribution. The simulation results have shown that the abutment pressure of isolated coal pillar is asymmetric distribution, and the peak value of pillar vertical stress continuously rises and transfers to the deep mining area with the increase of goaf. The formulation of dynamic and static scheme to reduce load,release pressure, and prevent burst reduces the stress of rock mass in the irregular coal pillar area,which effectively prevent rock burst of irregular coal pillar in the deep mining area.

关 键 词：孤岛煤柱 冲击地压 覆岩结构 煤柱失稳 

分 类 号：TD353[矿业工程—矿井建设]