石泉煤业X5陷落柱地质结构特征及导水性研究

Study on geological structure characteristics and water conductivity of X5 collapse column in Shiquan Coal Industry

针对山西石泉煤业有限责任公司(以下简称“石泉煤业”)特殊的地质条件和开采条件,以井田内规模最大的X5岩溶陷落柱为研究对象,采用地球物理勘探、结构特性探测、陷落柱柱体隔水性能试验等技术手段,对陷落柱发育特征、采动影响下陷落柱破碎带岩石隔水性能演化规律进行了分析,开展了奥灰承压水条件下3号煤层开采陷落柱导水性特别是滞后导水性的研究。研究表明,X5陷落柱柱体堆积体密实,裂隙不发育,围岩结构完整,未发现导水性;X5岩溶陷落柱结构在宏观上具有明确的分段性,自下而上可划分堆石段、泥石浆段和岩块碎屑段;30107综采工作面开采后隔水层上方陷落柱受开采扰动范围在35 m左右,扰动范围外陷落柱整体结构完整,裂隙不发育。

In view of the special geological and mining conditions of Shanxi Shiquan Coal Industry Co.,Ltd.(hereinafter referred to as "Shiquan Coal Industry"),taking the largest X5 karst collapse column in the mine field as the research object,the development characteristics of the collapse column and the evolution law of the water resistance of rocks in the fractured zone of the collapse column under the influence of mining are analyzed by geophysical exploration,structural characteristics detection,water resistance test of collapse column and other technical methods,and the water conductivity,especially the lagging water conductivity,of the collapse column during the mining of No.3 coal seam under the condition of Ordovician limestone confined water is studied.The research shows that the accumulation body of X5 collapse column is dense,the cracks are not developed,the surrounding rock structure is complete,and no water conductivity is found;the structure of X5 karst collapse column has a clear segmentation on the macro level,and can be divided into rock-fill section,mud-rock slurry section and rock-block debris section from bottom to top;after the mining of 30107 working face,the mining disturbance range of the collapse column above the aquiclude is about 35 m,the overall structure of the collapse column outside the disturbance range is complete,and the fracture is not developed.