大采空区覆岩破坏高度测控试验分析

Experimental study on detecting and controlling the height of overburden rock damage of goaf of large scale mined area under the Xitian River

确定采空区上覆岩层破坏高度,对"三下"煤层安全、高效开采具有重要意义。利用彩色钻孔电视系统对覆岩破坏高度、现场钻孔冲洗液漏失量和钻孔水位变化等进行观测与分析,摸清煤层开采后大采空区上覆岩层内垮落带和导水裂缝带的发育高度及其分布形态和特点。这对安全、高效开采和大采空区围岩稳定性有效控制和定量化预测预报提供依据。

The determination of damage height of superincumbent stratum of goaf has immense meaning for safety and reasonable exploitation of coal seam under water body, building and railway. The correlation detections are studied in terms of the damage height of overburden rock, the inner collapse zone and the expanding height of crack zone of homing water and their distribution form after excavating the superincumbent stratum of coal seam are shown by the leakage of in-situ drilling fluid and the change of water level in bore and the images from color TV system in bore.