特厚复合顶板离层破坏机理研究
Study on Failure Mechanism of Abscission Layer Failure of Extra-thick Compound Roof
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摘要: 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。Abstract: To solve the problem that extra-thick compound roof in Guiqing Coal Mine is easy to cause abscission layer failure and improper maintenance of roadway is easy to lead to large area roof caving accident, based on the theoretical analysis and numerical modeling, we discuss the reasons that extra-thick compound roof rock beam occurs abscission layers and failure features, and reveal the damage laws of rock beam. The results show that the abscission layer failure of compound roof occurs on the both sides of rock beam and then extends to the middle of rock beam; the initial position of rupture failure on both sides of rock beam occurs on the upper end and the lower end in the middle of rock beam. The causal relationship of roadway instability with extra-thick compound roof is joint fissure or fault structure development, low roof rock mass strength, lower rock beam deformation, fracture, abscission layer failure, upper rock beam abscission, fracture failure, surrounding rock instability.
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