综放开采覆岩破坏特征与导水断裂带高度模拟研究

为了研究煤矿综放开采覆岩破坏规律与导水断裂带高度，通过数值模拟分析了采动覆岩破坏过程，采用理论分析方法建立了直接顶破坏与基本顶砌体梁失稳力学模型，揭示了直接顶与基本顶失稳机制。基于盛泰煤矿15201综放工作面采矿地质条件，研究了不同采高、工作面倾向长度、煤层倾角条件下导水断裂带最大高度。研究结果表明：导水断裂带高度与煤层采高、工作面倾向长度、煤层倾角呈正相关关系；导水断裂带高度数值模拟结果位于《建筑物、水体、铁路及主要井巷煤柱留设与压煤开采规范》中经验公式计算结果范围之内，验证了该数值模拟模型及岩性参数的合理性。

Investigation on overburden failure characteristic and height of water-conducted fracture zone due to fully mechanized caving mining

In order to study overburden failure characteristics and height of water-conducted fracture zone, the mining overburden failure process was analyzed by numerical simulation.The immediate roof failure mechanical model and the basic roof masonry beam instability mechanical model were established by theoretical analysis.The mechanical model of immediate roof failure and basic roof masonry beam instability was established by theoretical analysis method, and the mechanism of immediate roof failure and basic roof instability was revealed.Based on the mining geological conditions of 15201 fully mechanized caving face in Shengtai Coal Mine, the maximum height of water-conducted fracture zone under different mining height, dip length of working face and coal seam dip angle were studied.The research results show that: the mining height, dip length of working face and coal seam dip angle are positively correlated with the height of water-conducted fracture zone; the numerical simulation results of height of water-conducted fracture zone are within the range of calculation results of the