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首页> 外文期刊>Mine water and the environment >Using a Fluid-Solid Coupled Numerical Simulation to Determine a Suitable Size for Barrier Pillars When Mining Shallow Coal Seams Beneath an Unconsolidated, Confined Aquifer
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Using a Fluid-Solid Coupled Numerical Simulation to Determine a Suitable Size for Barrier Pillars When Mining Shallow Coal Seams Beneath an Unconsolidated, Confined Aquifer

机译：当在未固结，承压含水层下开采浅层煤层时，使用流固耦合数值模拟来确定障碍柱的合适尺寸

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摘要

Barrier pillars are an effective and fundamental measure to prevent water inrush when mining shallow coal seams under an unconsolidated, confined aquifer. Based on the complex geological and hydrogeological conditions in the southern area of the Qidong coal mine, the no. 6(1) coal seam there was selected for a research demonstration. A fluid-solid coupled numerical simulation was carried out using the universal distinct element code. The hydraulic pressures and seepage rates in overlying strata were analyzed for two mining cases, near the aquifer and near the fault. The results showed that the degree of interconnection between the bed-separated and vertical fractures, and increases in hydraulic pressures and seepage rates in overlying strata were key factors in predicting potential water inrush when mining shallow coal seams under an unconsolidated, confined aquifer. Combining the numerical simulation results with China's coal mining requirements, the no. 6(1) coal seam can be mined up to 90 m beneath the unconsolidated, confined aquifer, which limits mining to an altitude of -509.36 m. The width of the barrier pillar should be 30.7 m near the fault.
机译：在未固结密闭含水层下开采浅层煤层时，屏障柱是防止涌水的有效且基本的措施。根据启东煤矿南部地区复杂的地质和水文地质条件，选择了那里的6（1）煤层进行研究演示。使用通用的不同元素代码进行了流固耦合数值模拟。在两个含水层附近和断层附近的开采案例中，分析了上覆地层的水压力和渗透率。结果表明，在未固结密闭含水层下开采浅层煤层时，分层裂缝和垂直裂缝之间的相互连接程度，上覆地层中的水压和渗透率增加是预测潜在突水的关键因素。将数值模拟结果与中国的煤矿开采要求相结合，得出的结果是。 6（1）煤层可在未固结的承压含水层下方开采90 m，这限制了开采至-509.36 m的高度。断层附近的屏障柱宽度应为30.7 m。

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