浅埋深厚煤层开采导水裂隙带发育高度探测

Detection of Developmental Height of Water Flowing Fractured Zone in Shallow Deep Thick Coal Seam Mining

李家塔煤矿2#煤层厚度大,埋深浅,地表存在河流及季节性流水冲沟,地表被第四系风积沙覆盖,为了保证矿井开采过程中安全,避免造成溃水溃沙事故,需对其2#煤层开采过程中导水裂隙带发育高度进行研究。根据李家塔2#煤层采矿地质条件,采用井下“双端封堵测漏”技术对李家塔2^(#)首采工作面(122中01)回采后导水裂隙带发育高度进行探测。结果表明,李家塔2^(#)煤层开采后导水裂隙带发育高度71.47 m(采高4.0 m),裂采比17.87。研究成果为李家塔煤矿2#煤层开采及其周边矿井的安全开采提供一定的借鉴和参考意义。

No.2 coal seam in Lijiata coal mine has large thickness and shallow buried depth. There are rivers and seasonal flow gullies on the surface, and the surface is covered by Quaternary aeolian sand.In order to ensure the safety of mine mining and avoid water and sand inrush accidents, it is necessary to study the height of water flowing fractured zone in the mining process of No.2 coal seam. According to the mining geological conditions of Lijiata No.2 coal seam, the development height of water flowing fractured zone after mining in Lijiata No.2 first mining face(122 01) was detected by two-terminal plugging leak detection technology. The results show that the development height of the water flowing fracture zone after the mining of Lijiata No.2 coal seam is 71.47 m(mining height is 4.0 m), and the fracture-mining ratio is 17.87. The research results provide certain reference and significance for the safe mining of No.2 coal seam and its surrounding mines in Lijiata Coal Mine.