摘要
煤层开采尺寸的增加会使采场围岩受采动影响范围增大,尤其是在煤层底板强含水层赋存条件下,研究面长效应对底板稳定性的影响意义重大。我国华北型矿区均受石炭二叠纪煤系底部的太灰、奥灰强含水层影响,底板突水的危险性与采动充分程度密切相关。此次通过水岩耦合数值仿真模拟,分析不同面长条件下底板隔水层矿压显现特征,运用fish程序将进入塑性破坏状态岩石调整为应变软化模型,研究受面长效应的影响时,底板隔水层的破坏程度、破坏区形态。研究结果可为承压水上安全开采预防措施的采取提供参考。
The increase of the size of coal seam mining will increase the influence range of mining surrounding rock in mining, especially under the condition of strong aquifer in coal floor, the influence of surface length effect on the stability of floor is of great significance. The North China-type mining areas are affected by the high ash and austral ash aquifers at the bottom of the Carboniferous Permian coal system. The risk of water inrush from the floor is closely related to the sufficient degree of mining. Through the numerical simulation of water-rock coupling, the characteristics of rock pressure in the aquifer under different surface length conditions were analyzed. The fish program was used to adjust the rock into the strain-softening model to study the influence of the surface length effect. The degree of damage of the aquifuge and the shape of the damaged zone were studied. The research results provided reference for the prevention measures for safe mining of pressurized water.
引文
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