National Energy Group Guoshen Dananhu No.2 Mine
China Coal Technology and Engineering Group Shenyang Design and Research Institute Co., Ltd.

为探究煤矿露天转地下开采过程，露天开采遗留坑底水仓渗流对井工巷道开采稳定性的影响；以内蒙古平庄西露天矿为研究背景，采用FLAC数值模拟软件，对南北两翼水仓及井工巷道建模，分析常水位及极限水位工况下，两翼水仓及巷道的开挖沉降系数、孔隙水压力及渗流情况；在此基础上对两翼巷道提出在开采过程中的注意事项及改进措施。数值计算结果表明：2种工况下巷道最大塑性压力均集中在巷道底部；位移变形塑性区均未贯通，巷道在渗流影响下未发生整体塑性贯通破坏及透水破坏；极限水位工况下，两翼巷道底部渗流量均有明显增长，但是最大渗流量均满足规范要求；受时间效应影响巷道围岩强度下降同时会产生长期蠕变变形，因此坑底及水池需采取防排水措施。

In order to explore the influence of the seepage of the leftover water sump in the open pit on the mining stability of the mine roadway after the coal mine is converted from open pit mining to underground mining, taking Pingzhuang West Open pit Mine in Inner Mongolia as the research background, the two wing water silos and mine workings are modeled by using FLAC numerical simulation software. On this basis, the points for attention and improvement measures in the mining process of the two wing roadway are proposed. The numerical results show that the maximum plastic pressure of the roadway is concentrated at the bottom of the roadway under two working conditions; the displacement deformation plastic zone is not connected, and the tunnel has no overall plastic connection failure and water permeability failure under the influence of seepage; under the condition of extreme water level, the seepage flow at the bottom of both wings of the roadway increases obviously, but the maximum seepage flow meets the specification requirements; due to the time effect, the strength of the surrounding rock of the roadway decreases and long-term creep deformation will occur at the same time. Therefore, waterproof and drainage measures should be taken for the pit bottom and pool.

1 工程概况
2 基于流固耦合理论的数值模拟分析
2.1 流固耦合理论原理
2.2 两翼水仓数值模型
2.3 常水位水仓渗流影响分析
2.4 极端降雨条件水仓渗流影响分析
2.5 2种工况下渗流影响巷道情况对比
3 结语

ZHAO Jinsheng, LI Xiaojun, WANG Yong, et al. The influence of open-pit coal mine water chamber seepage on mine roadway[J]. Safety in Coal Mines, 2023, 54（11）: 227−232.