Planned to exploit coal Nos.2 and 3 in the No.3 winning district, Dongtan coalmine, because of well developed faults and fis?sures in the district, axial part of syncline easy to ponding, small interval between the two coal seams have made the water filling condi?tion relatively complex, thus the coal face will be seriously threatened by water hazards. To ensure coalmine safety in production, on the basis of No.3 winning district geological and hydrogeological condition analyses, analyzed aquifer water yield property, considered that the coal Nos.2 and 3 roof sandstone aquifers and coal No.3 floor sandstone aquifer are all weak to medium water yield property aquifers. Based on available data analyzed coal Nos.2 and 3 floor contours have carried out worked-out area ponding prediction after the coal seam extracted. The result has considered that the water filling aquifers during the No.3 winning district production have coal Nos.2 and 3 roof sandstone and coal No.3 floor sandstone aquifers, water inrush pattern is mainly coal face roof water, mining fissures are main water filling channel. On these bases, have carried out coal face water inflow estimation, and worked out coal face winning compre?hensive water control measures.%东滩煤矿三采区计划开采2、3煤层,该区具有断层裂隙发育、向斜轴部易积水、2煤层与3煤层间距较小等特点,充水条件相对复杂,回采工作面受水害威胁较严重.为确保矿井安全生产,在分析矿井三采区地质及水文地质条件的基础上,对含水层富水性进行了分析,认为2、3煤层顶板砂岩含水层和3煤层底板砂岩含水层均为极弱至中等富水性含水层;根据已有资料对2、3煤层底板等高线进行了分析,对煤层开采后采空区积水进行了预测;得出了三采区开采2、3煤层充水含水层为2、3煤层顶部砂岩及3煤层底板砂岩,涌水形式以工作面顶板来水为主,采后采动裂隙是回采工作面充水的主要通道,在此基础上,进行了工作面涌水量预计,并制定了工作面开采综合防治水措施.
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