The influence of inter-band rock on rib spalling in longwall panel with large mining height  

作　　者：Jiachen Wang Meng Li Zhaohui Wang Zheng Li Han Zhang Shixiong Song 

机构地区：[1]School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China [2]Coal Industry Engineering Research Center of Top-coal Caving Mining,Beijing 100083,China [3]Faculty of Engineering,Hokkaido University,Sapporo 060-8628,Japan

出　　处：《International Journal of Mining Science and Technology》2024年第4期427-442,共16页矿业科学技术学报（英文版）

基　　金：financial support from the National Key Research and Development Program of China (No.2023YFC2907501);the National Natural Science Foundation of China (No.52374106);the Fundamental Research Funds for the Central Universities (No.2023ZKPYNY01)。

摘　　要：In order to improve rib stability,failure criteria and instability mode of a thick coal seam with inter-band rock layer are analysed in this study.A three-dimensional mechanical model is established for the rib by considering the rock layer.A safety factor is defined foy the rib,and it is observed that the safety factor exhibits a positive correlation with the thickness and strength of the inter-band rock.A calculation method for determining critical parameters of the rock layer is presented to ensure the rib stability.It is revealed that incomplete propagation of the fracture at the hard rock constitutes a fundamental prerequisite for ensuring the rib stability.The influence of the position of the inter-band rock in the coal seam on failure mechanism of the rib was thoroughly investigated by developing a series of physical models for the rib at the face area.The best position for the inter-band rock in the coal seam is at a height of 1.5 m away from the roof line,which tends to provide a good stability state for the rib.For different inter-band rock positions,two ways of controlling rib by increasing supports stiffness and flexible grouting reinforcement are proposed.

关 键 词：Rib spalling Inter-band rock Large mining height Limit analysis Physical model experiment Numerical simulation 

分 类 号：TD823[矿业工程—煤矿开采]