煤层过沟开采覆岩破坏特征及地表水入渗规律研究
Study on overburden failure characteristics and surface water infiltration law of coal seam mining through gully
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摘要: 为分析煤层过沟开采覆岩破坏特征及地表水入渗规律，选取过沟开采典型工作面为研究对象，基于工程地质条件及岩层物理力学性质，采用UDEC建立了覆岩破坏数值模型，研究了煤层过沟开采覆岩破坏特征；数值计算得到导水断裂带高度为230~250 m，实测导水断裂带高度为225~245 m，两者结果较吻合；通过提取覆岩采动裂隙并导入COMSOL，构建了煤层过沟开采地表水入渗数值计算模型，分析了地表水沿采动裂隙入渗至工作面的规律。结果显示：当工作面推采200、250、300 m时，导水断裂带沟通地表，地表水沿裂隙入渗至工作面，稳定后的水量分别为10.4、14.3、19.7 m3/h；以工作面推采300 m为例，对比分析了数值计算与现场实测的工作面稳定水量，两者所得结果相差较小。Abstract: In order to analyze the overburden failure characteristics and surface water infiltration law of coal seam mining through gully, the typical working face of coal seam mining through gully is selected as the research object. Based on the engineering geological conditions of typical working face and the physical and mechanical properties of strata, the numerical model of actual strata is established by UDEC, and the overburden failure characteristics of coal seam mining through gully are studied. The results show that the height of water-conductive fractured zone is 230-250 m by numerical calculation and 225-245 m by field measurement. By extracting mining fissures of overburden and introducing them into COMSOL, the numerical calculation model of surface water infiltration after coal seam mining is constructed, and the law of surface water infiltration to the working face along the mining fissures is analyzed. The calculation results show that when the working face is advanced to 200, 250 and 300 m, the water-conductive fractured zone connects with the surface, and the surface water infiltrates into the working face along the fracture, and the stable water quantity is 10.4, 14.3 and 19.7 m3/h respectively. Finally, taking the working face advancing to 300 m as an example, the stable water quantity of working face obtained by numerical calculation and field measurement is compared and analyzed, and the difference between the two results is small.
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