吉林临江市永安煤矿煤层冲击倾向性数值模拟

Numerical simulation studies on burst tendency of coal layers at Linjiang in Yong'an Coal Mine,Jilin Province

临江市永安煤矿地质构造复杂,且已经进入深部开采阶段,煤体采动所形成的矿压对安全生产造成较大威胁。为防治其冲击地压的发生,对其煤层进行了冲击倾向性数值模拟研究,分析了煤层在自重应力场和构造应力场下水平应力、垂直应力大小及分布规律,得出结论:(1)应力集中区出现在地质构造复杂地带,凡遇褶皱和煤层尖灭处,且强度相对较大,即冲击倾向性相对较强。(2)水平应力最大值接近自重应力,垂直应力最大值约为自重应力的1.8倍。水平应力最大值与垂直应力最大值均出现在煤层尖灭处。(3)数值模拟得出结果和实际开采吻合较好,开采时注意防范,确保矿井安全开采。

Linjiang-Yong＇ an Coal Mine lies in complex geological structure zone and has entered into the deep mining stage, the mine pressure of coal mining cause bigger threat for production safety. To prevent the occurrence of rockburst, Studied on burst tendency numerical simulations and analyzed the size and the distribution of horizontal stress ,vertical stress. The results for this research were as following： First, area of stress concentration appears complex geological structure zone, Whenever fold and coal annihilation,and it is a relatively strong. Namely, burst tendency is relatively strong. Second, the maximum horizontal stress is close to the gravitational stress. The maximum vertical stress is 1.8 times more than the gravitational stress. The maximum horizontal stress and the maximum vertical stress all appear in coal annihilation. Third, Results obtained by numerical simulation agree well with actual mining, so mining should pay attention to the prevention and ensure the safety mining.