综放工作面上覆老空积水探放技术

Exploration and Drainage Techniques for Gob Water above Fully-Mechanized Caving Working Face

杨村煤矿D13171综放工作面上覆的中13201工作面采空区存有大量的老空水,给工作面的回采带来了极大的危害。分析认为,老空水的主要来源一是13201工作面上部的新近系及古近系泥灰含水层的下渗补给,二是工作面回采后,为防止采空区煤层自燃,向老空区注入的灭火灌浆水;估算老空水的水量约为16000m3。利用ZYG-650型矿用钻机对采空区积水进行了探放,探放水结果显示,所施工的4个钻孔的累计放水量为14800m3,工作面回采期间两个验证孔已探到老空区积水的最低位置,钻孔无流水,说明老空水已彻底排干,从而解除了对工作面的威胁,保证了矿井的安全高效生产。

There is large amount gob water in Z13201 working face gob area above the Yangcun coalmine D13171 fully-mechanized caving working face,brings very large harm to working face extraction.Analysis considers that the gob water has two main sources,one is from downward seepage of Neogene and Paleogene marl aquifer above Z13201 working face,and another is injected extinguishing water to prevent coal seam in gob area from spontaneous combustion,and estimated water amount is 16000m3.Using ZYG-650 mine drill to explore and drain gob water,the result has demonstrated that total drained water amount from 4 boreholes is 14800m3.Two verifying boreholes have detected lowest position of gob water during the extraction of the working face,and no more water flow from boreholes,thus the gob water has totally drained,working face threat released and high efficiency safe production of coalmine guaranteed.