【摘要】 针对深部矿井承压水上采煤导致的底板突水问题,在深部开拓时,必须进行必要的可行性分析和安全开采评价。通过对某矿区深部扩大区水文地质条件分析,认为该区域煤矿可开采。利用底板岩体渗流模型及修正的水力参数,基于FLAC3D各向异性渗透模型进行应力场-渗流场耦合模拟,得出底板破坏深度。结果表明:正常区段工作面底板破坏深度为25 m,受构造破坏区段底板破坏深度为50 m。根据突水系数法对安全开采深度及工作面斜长进行了评价,提出了可行的水害防治措施。保持0.06 MPa/m的突水系数,采取疏水降压措施,把水头疏降到-950 m标高时,15煤层工作面的开采是安全的。更多还原

【Abstract】 In order to overcome floor water inrush under mining above confined water,especially for deep mine,it’s necessary to analyze the feasibility and make the safety evaluation before development and mining.According to the hydrogeological conditions analysis at deep mining area of a certain mine,it is considered that this area is available to mining.With the use of the floor seepage model and the modified hydraulic parameters,and based on FLAC3D anisotropic permeability model,the coupled simulation of stress field-seepage field is simulated to obtain the depth of floor failure.The results show that the floor damage deepness at normal region and at structural damage region are about 25 m and 50 m respectively.According to the water bursting coefficient,the safety depth of mining and the length of working face are evaluated.At the same time,prevention and treatment measures of water disaster are also presented.Keeping the water bursting coefficient of 0.06 MPa/m,taking hydrophobic decompression measures,lowering the water head to-950 m level,it is safe to recover the 15# coal seam.更多还原