摘要
结合具体工程案例分析了冲击显现特征,从围岩应力分布和弹性能释放两个角度分析了其发生冲击地压的主要原因,并提出了相应的防范及防治对策。研究结果表明:深部厚煤层掘进留设顶底煤后,巷道顶底板煤岩体水平应力集中程度较高,尤其是巷道底煤,应力集中系数达到1.6;开挖后底煤2m处煤岩体弹性能呈迅速积聚随后释放特征,是重点潜在冲击危险源,开挖稳定后,顶、底板和迎头前方弹性能水平较高。为此提出了不留设底煤或底煤留设小于2m的防范措施,基于围岩弹性能的演化规律提出了卸-支时空耦合的冲击地压防治对策。
Rock burst appear characters were analyzed under practical example,the main reasons of rock burst happened were analyzed from two sides as surrounding rock stress distribution and elastic energy relation,and then corresponding prevention methods were put forward. The results showed that the degree of horizontal stress concentration was high in roof and floor of roadway as roof and floor coal were layout after thick seam was driving in deep,floor coal was high specially,its factor reached 1. 6,the elastic energy of coal and rock mass in position of 2m in floor coal appeared as accumulated firstly and then relaxed,it was an importance and potential rock burst hazard source,when stability formed after driving,the elastic energy of roof,floor and head-on were high. Then the preventive measures as without floor coal or floor coal thickness less than 2m were put forward,unloading and supporting time and space coupling measures for rock burst prevention was put forward under surrounding rock elastic energy evaluation law.
出处
《煤矿开采》
北大核心
2017年第5期75-77,85,共4页
Coal Mining Technology
基金
国家自然科学基金资助项目(51574149)
国家重点研发计划(2016YFC0801401)
关键词
底煤
掘进巷道
冲击地压
卸-支时空耦合
floor coal
driving roadway
rock burst
unloading- supporting time and space coupling
作者简介
杨磊（1988-）,男,江苏淮安人,助理研究员,主要从事冲击地压、岩层控制等方面的研究工作.
