厚松散层薄基岩浅埋煤层导水断裂带高度研究

Study on Water-conducting Fracture Height of Shallow Buried Coal Seam with Thick Loose Bed and Thin Base Rock

薄基岩浅埋煤层开采形成的导水断裂带易造成水资源破坏,导水断裂带高度确定是含水层免受破坏的关键。以青龙寺煤矿5-20101工作面为研究对象,采用物理相似模拟、理论计算及井下仰孔注水测漏法分析煤层开采导水断裂带发育高度。研究表明:工作面开采后采空区上方覆岩形成拱形梁结构,拱的边缘位置为拉应力区,该区域纵向切落裂缝为岩层的主要导水通道,导水断裂呈"八字形"分布;5-20101工作面导水断裂带发育高度为52.3~62 m,平均57.2,裂采比为24.2;导水断裂带发育不会与萨拉乌苏组含水层贯通,生产过程中不受含水层倒灌的威胁。

Water-conducting fissures formed in shallow seam mining in thin bedrock are easy to cause water resources damage.The determination of the height of water-conducting fissures is the key to avoid the damage of aquifers. Taking 5-20101 working face of Qinglongsi Coal Mine as the research object, the development height of water-conducting fracture zone in coal seam mining is analyzed by physical analogy simulation, theoretical calculation and water injection leak detection method. The research shows that the overburden rock above the goaf after mining forms an arch beam structure, the edge of the arch is a tension stress area, the vertical shear fracture is the main water conduction channel of the stratum, and the water conduction fracture is octagonal distribution;the height of water conduction fracture is 52.3 m to 62 m, with an average of 57.2 m, and the ratio of fracture to mining is 24.2;the development of water conduction fracture is not connected with the Sarawusu aquifer. The production process is not threatened by aquifer irrigation.