Research on simulation technology of surface air leakage of shallow-buried goaf based on network calculatio
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摘要: 为分析浅埋煤层地表开敞性裂隙漏风对矿井通风系统与采空区流场的影响，构建了地表漏风条件下浅埋采空区流场与井巷风网耦合模型。针对采空区网络分支数多的特点，提出了采用LDLT分解法改进牛顿法解算通风网络的性能。以红柳林煤矿15207采空区地表漏风为例，模拟了大规模地表漏风对工作面通风系统的影响和不同地表漏风量下采空区流场，得到地表漏风导致采空区自燃“三带”分布异形化和地表漏风量不宜超过5 m3/s的结论，为工作面安全回采提供了技术支撑。Abstract: In order to analyze influence of surface air leakage of shallow-buried coal seam on mine ventilation system and goaf flow field, a coupling model of shallow-buried goaf flow field and roadway ventilation network under surface air leakage was established. According to feature of many branches in goaf network, a LDLT decomposition method was put forward to improve ventilation network calculation performance of Newton method. Taking surface air leakage of 15207 goaf of Hongliulin Coal Mine as an example, affection of large-scale surface air leakage on ventilation system and goaf flow field under different surface air leakage were simulated, and conclusions were gotten such as unnormal distribution of spontaneous combustion "three zones" in goaf caused by surface air leakage and surface air leakage should not exceed 5 m3/s, which provided technical support for safety mining of working face.
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期刊类型引用(7)
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