基于覆岩破坏传递的导水裂缝带发育高度研究

Study on development height of permeable fractured zone based on overburden failure transfer

采动影响下覆岩破坏及导水裂缝带高度对于水体下采煤、保水采煤等具有重要意义。分析了采动影响下覆岩破坏传递过程,并将其划分为传递发育阶段和终止阶段;通过理论分析建立了上覆岩层悬空完整和悬伸稳定力学模型,提出以极限悬空距和极限悬伸距为判据用于判断每层岩层破坏情况,得出了计算导水裂缝带高度理论新方法,并通过工程实例与实测值进行了对比分析。结果表明,基于覆岩破坏传递模型的导水裂缝带发育高度计算方法预计的导水裂缝带高度(158.8 m)与实测结果(150～170 m)吻合较好,验证了该理论方法的可行性。

It is extremely significant for coal mining under water bodies and water conservation mining to research overburden failure and the height of permeable fractured zone.The processes of overburden failure transfer were analyzed,which could be divided into transmission development stage and transmission termination stage.Through theoretical analysis,mechanical model of strata suspended integrity and overhanging stability were established.The limited suspension distance and overhang distance of each stratum were proposed to judge the damage of each layer.A new theoretical method to predict the development height of permeable fractured zone was put forward.The project example was compared with the field data.The results show that the height of permeable fractured zone by this theorical method(158.8 m)is consistent with the measured data(150-170 m),verifying its rationality.