基于微观裂隙扩张的采场底板突水机理研究.pdf

第 33卷 第 4期 采矿与安全工程学报 Vol.33 No.4 2016年 07月 Journal of Mining Safety Engineering July 2016 文章编号：1673-3363-(2016)04-0624-061 基于微观裂隙扩张的采场底板突水机理研究 高玉兵 1，刘世奇 2，吕斌 2，李昆奇 2 (1．中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室，力学与建筑工程学院，北京 100083； 2．中国矿业大学(北京)资源与安全工程学院，北京 100083) 摘要 基于矿山压力和岩层控制理论，分析了工作面附近支承压力及底板水压的空间分布特征， 确定了两者对底板的力学作用机制。通过建立裂隙力学模型，从微观角度研究了支承压力和水压 对裂隙的作用效果；以薄板理论为依据，从宏观角度研究了含水层水压对底板有效隔水层的作用 机理，并给出底板突水极限水压值的计算公式。结果表明：支承压力的增大会导致裂隙渗透系数 的减小；水压的增大会导致岩体强度的降低和裂隙劈裂长度的增加。采场底板突水的实质是采动 引起的矿山压力和承压水水压共同作用下微观裂隙的扩张和底板有效隔水层的断裂。 关键词 支承压力；水压；微观裂隙；有效隔水层；突水机理 中图分类号 TD 353 文献标志码 A DOI 10.13545/ki.jmse.2016.04.009 Mechanism study of floor water inrush around mining field based on micro-crack extension GAO Yubing1，LIU Shiqi2，LYU Bin2，LI Kunqi2 (1．State Key Laboratory for Geomechanics and Deep Underground Engineering，School of Mechanics Civil Engineering， China University of Mining Technology (Beijing)，Beijing 100083，China；2．School of Resources and Safety Engineering， China University of Mining Technology (Beijing)，Beijing 100083，China) Abstract Based on the mine ground pressure and strata control theory, spatial distribution characteris- tics of ground pressure and floor water pressure around mining field have been analyzed in this paper, and then the mechanical effects of both these pressures on the coal floor have been determined. By set- ting up mechanics model, the effects of ground pressure and water pressure on a set of tilted cracks have been studied from a microcosmic point of view. Based on the thin plate theory, the effects of water pressure on the effective water-resisting layer have also been studied from a macroscopic point of view. Finally, a theoretical formulae of limiting hydraulic pressure has been deduced. The results have shown that the increase of abutment pressure can lead to the decrease of permeability coefficient; the increas