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为解决糯东煤矿低透气性煤层瓦斯抽采及消突问题,在糯东煤矿17煤实施了水力冲孔试验。研究发现,水力冲孔能有效提高煤体渗透率,促进瓦斯抽采,该措施解决了糯东煤矿松软低透气性突出煤层快速消突问题,提高了煤巷掘进单进。与传统穿层抽放措施相比,消突工期缩短了4.2倍,水力冲孔卸压增透技术执行后抽采浓度和抽采纯量分别为传统措施的3.4和4.4倍。利用冲孔压力与冲出煤量的关系,确定了最有效泵站工作压力为18Mpa,并在实际冲孔过程中得到了有效的验证。研究成果为糯东煤矿低透气性高突煤层瓦斯治理提供依据和基础。
In order to solve the problem of gas drainage and gas outburst in low permeability coal seam in Wandong coal mine, hydraulic punching test was carried out at 17 coal in Wandong Coal Mine. The study found that hydraulic punching can effectively improve the permeability of coal and promote gas drainage. This measure solves the problem of quick elimination of loose and low permeability coal seam in Wandong Coal Mine, and improves the single entry of coal heading. Compared with the traditional strata drainage measures, the project cancellation period was shortened by 4.2 times. After the hydraulic piercing pressure relief enhancement technology was implemented, the pumping concentration and pumping capacity were 3.4 and 4.4 times of the traditional measures respectively. Utilizing the relationship between punching pressure and outflow coal quantity, the working pressure of the most effective pumping station was determined to be 18Mpa, and validated in the actual punching process. The research results provide the basis and basis for gas control in the coal seam with low gas permeability and high gas permeability in Wandong Coal Mine.