近水平煤层长距离采空区定向疏水钻孔选择方法研究

Study on Selection Method of Directional Drainage Borehole in Long-Distance Goaf of Near Horizontal Coal Seam

【目的】为解决近水平煤层长距离采空区定向疏水钻孔选择的难题,需要一套量化评价的方法,为矿井探放水工程施工提供依据。【方法】本研究通过构建近水平煤层长距离采空区定向疏水钻孔水量计算模型,以伯努利方程为基础,综合分析开孔位置、孔径、孔深等参数,推导单孔及分支孔涌水量计算公式。【结果】以母杜柴登煤矿实际施工的采空区定向疏水钻孔为例,分析对比计算公式的准确性,同时对近水平煤层条件下单孔与分支孔水量、经济效益进行对比分析。【结论】得出了近水平煤层长距离采空区定向疏水钻孔布置的影响因素和选择方法。该方法准确性较高、计算简便,为类似矿井采空区水害治理提供了一定的借鉴和参考。

[Purposes]To solve the problem of selecting directional drainage boreholes for long-distance goaf in near horizontal coal seams,a quantitative evaluation method is needed to provide a basis for the construction of mine water exploration and drainage engineering.[Methods]This article constructs a di-rectional drainage drilling water volume calculation model for long-distance goaf in near horizontal coal seams.Based on the Bernoulli equation,it comprehensively analyzes parameters such as hole position,aperture,and depth,and derives formulas for calculating the water inflow of single and branch holes.[Findings]Taking the directional drainage drilling in the goaf of the Mudu Chaideng coal mine as an ex-ample,the accuracy of the calculation formulas was analyzed and compared.At the same time,the water volume and economic benefits of single hole and branch hole under near horizontal coal seam conditions were compared and analyzed.[Conclusions]The influencing factors and selection methods of directional drainage drilling layout in the near horizontal coal seam long-distance goaf have been identified.This method has high accuracy and simple calculation,providing a certain reference and reference for the treatment of water damage in goaf of similar test mines.