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为了改善矿区开采沉陷预计精度 ,解释华东矿区地表下沉系数大于 1的原因 ,减小采动损害 ,本文基于现场钻孔水位动态观测结果 ,获得了覆岩破坏与含水层水位变化的 3种对应关系。根据含水层失水后固相颗粒有效应力增加引起岩土体孔隙比的变化 ,建立了含水层失水固结沉降机理 ,利用叠加原理 ,导出了地下开采与含水层失水共同引起的地面沉降计算方法。研究实例表明 ,失水下沉占煤层开采下沉的 2 5%。
In order to improve the prediction accuracy of mining subsidence and explain the reason that surface subsidence coefficient is greater than 1 in Huadong mining area and reduce mining damage, three kinds of correspondences between subsidence and aquifer variation are obtained based on the dynamic observation results of borehole water level. relationship. According to the change of void ratio of rock and soil after the effective stress of the solid-phase particles in the aquifer is lost, the mechanism of water-loss consolidation and settlement of the aquifer is established. By means of superposition principle, the ground subsidence caused by underground mining and aquifer dehydration is derived Calculation method. The research shows that water loss and sinkage account for 25% of the subsidence of coal seam mining.