下霍煤矿厚黄土区井下工作面开采地表沉陷规律研究

Study on Surface Subsidence Law of Underground Working Face in Thick Loess Area of Xiahuo Coal Mine

下霍煤矿地表几乎被黄土层所覆盖,井下采用综采放顶煤采煤方法,开采强度大,地表沉陷变形剧烈,对地表建(构)筑物的破坏严重。采用数值模拟与理论分析相结合的方法,研究了黄土层岩层移动机理。结果表明:垮落裂缝带异常发育,随着工作面开采地表下沉量逐渐增大;黄土黏结力弱易引起竖向裂缝扩展,导致地表裂缝发育。

The surface of Xiahuo Coal Mine is almost covered by loess layer,and the underground coal mining method of fully mechanized top coal caving has the advantages of high mining intensity,severe surface subsidence deformation and serious damage to surface structures.The movement mechanism of loess strata is studied by means of numerical simulation and theoretical analysis.The results show that the collapse fracture zone is abnormally developed,and the surface subsidence increases gradually with the mining face mining,the weak bonding force of loess can easily lead to the expansion of vertical cracks and lead to the development of surface cracks.