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为了解决特厚复合顶板厚度大、易离层破坏,其巷道维护不当极易造成大面积冒顶伤亡事故的难题,以桂箐煤矿为工程背景,基于理论分析与数值模拟,探讨了特厚复合顶板岩梁产生离层与断裂破坏的原因与特征,揭示了其岩梁的破坏规律。结果表明:复合顶板离层破坏先发生在岩梁的两边然后向中间扩展;岩梁两边断裂破坏的初始位置发生在岩梁两边的上端处和岩梁中间的下端处。特厚复合顶板巷道失稳因果关系为:节理裂隙或断层构造等发育-顶板岩体强度低-下部岩梁变形、断裂、离层破坏-上部岩梁离层、断裂破坏-围岩失稳。
In order to solve the problem of large-scale roof casualties caused by the large thickness of the thick composite roof, easy to separate from the layer and improper laneway maintenance, the paper takes Gui-箐 coal mine as the engineering background, and based on the theoretical analysis and numerical simulation, The causes and characteristics of the delamination and fracture of the rock beam are revealed, and the breaking rules of the rock beam are revealed. The results show that the failure of the composite roof occurs firstly on both sides of the rock beam and then expands to the middle. The initial position of fracture damage on both sides of the rock beam occurs at the upper end of both sides of the rock beam and at the lower end of the rock beam. The causality of the roadway with ultra-thick composite roof is such as the development of joint fissure or fault structure. The strength of roof rock mass is low. The deformation, fracture and delamination of lower rock beam. The upper rock beam is separated and ruptured. The surrounding rock is not stable.