浅埋煤层长壁开采超前支承压力变化特征  

Changing feature of advancing abutment pressure in shallow long wall working face

作　　者：任艳芳[1,2] 宁宇[1,3] 

机构地区：[1]天地科技股份有限公司开采设计事业部,北京100013 [2]煤炭科学研究总院开采设计研究分院,北京100013 [3]中国煤炭科工集团有限公司,北京100013

出　　处：《煤炭学报》2014年第A01期38-42,共5页Journal of China Coal Society

基　　金：国家科技支撑计划资助项目(2012BAB3B02);国家自然科学基金资助项目(U1261211)

摘　　要：利用数值模拟、相似模拟及现场实测的综合研究手段,以浅埋煤层开采顶板运动规律为基础,针对浅埋深长壁工作面超前支承压力分布规律及变化特征进行了研究。研究结果表明,浅埋深工作面超前支承压力分布规律与常规埋深煤层的类似。但由于浅埋煤层顶板运动的特殊性,其工作面超前支承压力的变化特征与常规埋深煤层之间有明显区别。浅埋深工作面超前支承压力峰值变化受基本顶破断与断裂带导通地表的周期性发生影响存在大小周期性变化。同一采高条件下,浅埋深工作面超前支承压力峰值在基岩层全部破断前的趋势是增大,但在基岩层全部破断后,峰值变化则基本遵循大小周期的变化规律。同一煤层,不同采高条件下,基岩层未全部破断的浅埋深工作面的超前支承压力峰值要大于基岩层破断后的浅埋深工作面的超前支承压力峰值。Based on the roof moving laws of shallow buried coal seam, the authors studied the distribution laws of shal- low buried coal seam and mastered the peak size, peak position and influence sphere of shallow buried workfaee ad- vancing abutment pressure through physics resemble simulation, numerical simulation and field observations, analyzed the influence of mining height changing and overlying rock broke to the changing features of workface advancing abut- ment pressure. The results show that because of the special roof movement of the shallow buried coal seam mining, the advance abutment pressure change featuresare are different from the normal buried coal seam mining. During the min- ing process of shallow workface, the peaks change of advancing abutment pressure that were influenced by fracture belt＇ s connectivity with the surface and breaking of the main roof occurs periodically shows as long and short period phenomenon.

关 键 词：浅埋深工作面 超前支承压力 相似模拟 覆岩破断 大小周期 

分 类 号：TD325[矿业工程—矿井建设]