综采放顶煤覆岩破坏规律与机理研究

Study on the Mechanizm and laws of Overburden Failure under Fully Mechanized Top Coal Mining

根据现场实测资料,结合相似材料模拟试验、数值计算,系统研究了潞安矿区综采放顶煤条件下覆岩破坏规律和导水裂缝带发育规律,揭示了覆岩破坏与岩层移动的机理。综采放顶煤条件下导水裂缝带异常发育,在同样采厚的条件下导水裂缝带最大高度比分层综采增大1.32倍,比普采增大2.23倍。综采放顶煤条件下裂高采厚比为19.75,与普采、分层综采初次采动条件下的裂高采厚比相近,基本符合初次采动导水裂缝带的发育规律。

According to the spot materials,simulation experiment with similar materials and numerical calculation,the paper makes a systematic study on the laws of overburden failure under fully mechanized top coal mining and of the water flowing fractured zone development in Lu An Mine.It also exposes the mechanism of overburden failure and the strata movement.It the water flowing fractured zone develops abnormally,its maximun height ratio is 1.32 bigger under the same exploiting thickness than the one under mechanized mining,2.23 under conventional mining.The crack height ratio under mechanized top coal mining is 19.75,which is similar with the one under conventional mining and the initial mining under fully mechanized slicing mining.It is also consistent with the development laws of the initial mining in the water flowing fractured zone.