【摘要】 利用覆岩破坏高度观测钻孔进行相关测试研究,根据现场钻孔冲洗液漏失量、钻孔水位变化以及井下彩色钻孔电视影像,探明了煤层开采后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。更多还原

【Abstract】 The vertical boreholes were drilled from the surface for correlation detection of the damage height of overburden rock mass. The expanding height of the inner collapsed zone and the permeable fractured zone as well as their distribution in the overburden rock mass after excavation of the coal seam were determined based on the leakage volume of drilling fluid, the change of water level in the boreholes and the borehole images by color TV.更多还原