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UDEC simulation of the water-pouring probability in exploiting waterproof coal pillars under the conditions of thick loose bed and ultrathin overlying strata
Author(s): 
Pages: 53-56,61
Year: Issue:  1
Journal: HYDROGEOLOGY & ENGINEERING GEOLOGY

Keyword:  采矿工程覆岩变形防水煤柱突水;
Abstract: 通过UDEC(Universal Discrete Element Code)对厚松散层及超薄覆岩条件下某矿工作面4种工况开采防水煤柱覆岩破坏特征的数值模拟以及物理模拟对计算结果的验证,得到了工作面走向中部覆岩冒落带高度随放采比的增大而增大、裂隙带高度随放采比的增大而发展缓慢的结论.覆岩沿高度方向形成"三带",但不同于其它条件下的放顶煤开采,采空区走向中部覆岩裂隙带高度与冒落带高度基本一致,顶板岩层呈现整体弯曲下沉.当放采比为2∶1与2.5∶1时,顶板岩层呈现整体弯曲缓慢下沉,裂隙带最大发育高度为20~22m.通过对覆岩破坏规律以及采区水文地质特征的分析,覆岩突水可能性很小.
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