为研究大倾角综放采场遗留顶煤运移规律及裂隙扩展情况,以王家山煤矿中二401工作面为研究对象,采用物理相似模拟实验与数值模拟实验相结合的方法,深入分析大倾角综放采场遗留顶煤运移及裂隙发育规律。结果表明,大倾角综放采场遗留顶煤破碎和运移具有非对称性,工作面倾斜中下部应力与位移量均大于倾斜上部。遗留顶煤在采空区内沿倾斜方向呈现“顶煤—直接顶—顶煤”交替堆积形态,倾斜下部堆积量大于倾斜中上部。围岩裂隙发育范围广,随工作面推进最终可扩展至3号煤层。针对遗煤特征综合提出此类采场的“两阶段”防灭火技术措施,达到良好的防灭火效果,确保工作面安全高效生产。

In order to study the migration law and crack propagation of the remaining top coal in the fully-mechanized cavingface with steeply dipping coal seam, the Zhonger 401 working face of Wangjiashan Coal Mine of Jingyuan Coal IndustryGroup was taken as the research object, and the physical similarity simulation experiment and numerical simulation experiment were combined to analyze the migration and crack development law of the remaining top coal in the fully-mechanizedcaving face with steeply dipping coal seam. The results show that the crushing and migration of the remaining top coal in thefully mechanized caving face with large dip angle are asymmetric, and the stress and displacement in the middle and lowerpart of the inclined working face are greater than those in the upper part. The remaining top coal in the goaf presents an alternating accumulation form of’ top coal-direct top-top coal’ along the inclined direction, and the accumulation amount inthe inclined lower part is greater than that in the inclined upper part. The fracture development range of overlying rock iswide, which can be extended to No. 3 coal seam with the advance of working face. The “ two-stage” fire prevention and extinguishing technical measures are put forward based onthe characteristics of residual coal, which achieves goodfire prevention and extinguishing effect and ensures the safe and efficient production of working face.