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任楼矿主采煤层上方直接覆盖着 5～ 1 5m的砾石含水层 ,严重威胁矿井安全生产 ,设计留设垂高为 80 m的防水煤岩柱。为论证所留煤柱是否安全合理 ,进行了矿区水文地质和上覆岩层岩石力学性质、水理性质试验。结果表明砾石层的含粘量较高 ,垂直渗透能力较弱 ;工作面浅部基岩泥岩类属较弱及中硬岩类型 ;基岩风化带内粘土矿物含量较大 ,吸水后体积膨胀 ,再生隔水能力强 ,受采动影响后 ,具阻水和抑制导水裂隙继续发展的双重作用 ;还进行了相似材料模拟 ,计算机模拟和公式计算。据以上研究结果 ,将防水煤岩柱缩小为 6 5m。 1 998年 5月已回采完毕 ,回收煤炭4 6× 1 0 4 t。
Renlou mine directly above the top coal seam covering 5 ~ 15m of gravel aquifer, a serious threat to mine safety production, designed to set aside the vertical height of 80m waterproof coal pillar. In order to demonstrate whether the coal pillar remained safe and reasonable, the hydrogeological and overlying strata rock mechanics and water quality tests were carried out. The results show that the gravel layer has a higher viscosity and a lower vertical permeability; the shale in the shallow part of the working face is weak and medium-hard type; the clay mineral content in the bedrock weathered zone is relatively large, Regeneration of water and strong, affected by the mining influence, with water and inhibit the dual role of water-conducting fractures continue to develop; also conducted a similar material simulation, computer simulation and formula calculation. According to the above research results, the waterproof coal pillar will be reduced to 65m. May 1998 has been completed mining, recovery of coal 4 6 × 1 0 4 t.