承压水上含隐伏构造底板突水机理研究

以昌恒煤矿9102工作面实际地质资料为基础，借助数值模拟与现场测试等手段，从底板应力分布特征与塑性区发育特征两方面分析了该工作面下隐伏构造对工作面推采的影响。研究结果表明：陷落柱等地质构造的存在，使得工作面回采时在地质构造前出现应力集中现象|工作面回采引发的底板岩体破坏形式主要以剪切破坏为主，且塑性区与陷落柱顶部靠近工作面一侧边界塑性区首先连通形成突水通道，进而引起底板突水|利用底板应变计监测工作面回采引发的煤层底板破坏情况，最终得出工作面回采引发的含隐伏构造底板的破坏深度与经验及理论公式的计算结果能保持一致，验证了现场测试方法的可行性及科学性，为承压水上底板含隐伏构造煤层的安全生产提供借鉴。

Study on water inrush mechanism of concealed structural floor in confined water

Based on the actual geological data of 9102 working face in Changheng Coal Mine,influence of underlying concealed structure on mining face is analyzed from stress distribution characteristics and plastic zone development characteristics using numerical simulation and field test.The results show that stress concentrates in front of geological structures during mining.The primary mining-induced failure mode of the floor rock mass is shear failure,and the plastic zone in the floor connects to the plastic zone on the top of the collapse column at the working face side forming water channels and leading to water bursting;the floor strain gauge is used to monitor the mining-induced floor damage.And the monitored damage depth is consistent with the calculation results of empirical and theoretical formulas,the feasibility and scientificity of the field test method are verified.The study can provide references for the safe mining for coal seams above confined water with concealed structure in the floor.