煤矿覆岩离层注浆减缓地表沉降机理与应用探讨

Disccussion on Mechanism and Application of Grouting in SeparatedBed to Reduce Surface Subsidence Induced by Coal Mining

对采动覆岩离层发展的时空规律、离层带注浆减沉效果评价方法和离层带注浆减缓地表下沉在建（构）筑物下采煤中的应用等问题进行了探讨．认为：在相同地质采矿条件下，离层带高度随采空区尺寸变化而变化，当采空区尺寸达到充分采动尺寸后，离层带高度达到该条件下的最大值；

Some problems about the method of grouting in separatedbed to reduce surface subsidence are discussed. These problems are the principle of bedseparation developing in the overburden strata disturbed by extraction, the method of estimating the result of reducing surface subsidence and its application in coal mining under buildings. By analyzing, it is considered that the height of a bedseparation zone varies with the working face length in the same geological and mining conditions. When the length of working face reaches the critical mining length, the maximum height of bedseparation occurs. The result of reducing subsidence should be estimated on the basis of the ratio of the volume of actully measured subsidence basin for filling in the bedseparation zone to that of the subsidence basin for unfilling in the bedseparation zone.