采动岩体强矿震破裂机制反演及其防治对策  

Rupture mechanism inversion of mining-induced strong mine earthquake and its preventive methods

作　　者：李铁[1] 倪建明[2] 李忠凯[2] 

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室土木与资源工程学院,北京100083 [2]淮北矿业股份有限公司,安徽淮北235000

出　　处：《采矿与安全工程学报》2016年第6期1110-1115,共6页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51274025);国家自然科学基金重点项目(51534002)

摘　　要：为认清海孜煤矿Ⅱ101和Ⅲ101采区强矿震频发的成因,据以制定针对性的防治对策,应用震源机制解答方法,反演9个强矿震的采动岩体破裂机制,结合现场调查、地应力测量和震源定位数据分析,得出强矿震的发生机制为:1)强矿震岩体破裂应力场具有继承性,受矿区构造应力场的显著控制;2)Ⅱ101采空区强矿震的发生极活跃,是由于Ⅲ1012工作面开采,使得采空区悬顶总面积超临界平衡状态;3)导致顶板向下滑动势增大,沿原有断层滑动活化;4)造成煤柱区底板采动应力场与原岩应力场叠加过载,克服原有断层的摩擦阻力运动活化或产生新断层。防治对策为:控制采空区面积过大;Ⅱ101老空区局部填充;Ⅲ101新采区由无煤柱开采修改为条带煤柱开采方式。To probe into the causes of frequent strong mine earthquakes at mining area Ⅱ101 and Ⅲ101 in Haizi Mine and to put forward targeted preventive methods, rupture inversion of nine strong mine earthquakes was carried out through the application of focal mechanism solution. With the consideration of field investigation, stress measurement and focus position analysis, formation mechanisms of strong mine earthquakes have been worked out： 1） Field of rock rupture stress in strong mine earthquakes has successive nature, and is strongly affected by tectonic stress in the mine; 2） The frequent occurrence of strong earthquakes in mining area Ⅱ101 results from the goaf imbalance due to mining in the working face Ⅲ1012; 3） The increase of roof sliding potential energy activates the original Fault slip; 4） The overloading of superposition between the mining pressure field in the coal pillar area and the rock mass stress field overcomes frictional resistance in original Fault activation, or generate new faults. Finally, the preventive methods are proposed as limiting the goaf area, partly fulfilling of the mining area II101, and changing of mining way from zero coal pillar to stripe coal pillar in new mining area Ⅲ101.

关 键 词：矿震 震源机制解答 采动应力场 岩层控制 

分 类 号：TD325[矿业工程—矿井建设]