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中文摘要：
随着煤炭资源的大规模开发,大型设备进入煤矿井下,修筑特大断面硐室已必不可少,随之而来的深部层状碎裂煤岩体所具有的特殊工程地质问题更加突出。棋盘井煤矿井底特大断面换装硐室（跨度9.9 m、高9.45 m）处于硐室密集区的层状碎裂围岩中,可供类比工程很少,施工难度很大。针对其围岩特点,采用三维小模型分析施工顺序、高边墙破坏规律和支护单元的功效,用三维大模型真实再现施工过程,反映围岩空间动态变化情况;优选出最优施工方案及块段施工合理错距;理论分析得出高边墙围岩潜在破坏机制不尽相同,水平应力释放是高边墙产生片帮、剥落的主要原因,并提出承载墙的概念。研究成果可为日后类似工程的设计、施工和研究提供有益的借鉴和参考。
英文摘要：
With the rapid development of mining,the large-scale equipment enters the underground coal mine.It is inevitable to excavate chamber with large cross-section in the deep,bedded and cataclastic surrounding rocks and the special problems of engineering geology will be much more obvious.Reloading chamber with large cross-section（the span is 9.9 m,the wall is 9.45 m） is constructed in bedded and cataclastic surrounding rocks in Qipanjing coal mine,which is difficult to construct and similar projects are few.According to the characteristics of surrounding rocks,the construction sequence,the failure rule of high wall and the effect of support elements are studied by the three-dimensional small model;the construction process and the spatial dynamic change of surrounding rocks are really reappeared by the three-dimensional big model.The optimized construction scheme and the reasonable staggered distance of the section construction are chosen.The theoretical analysis shows that the failure mechanisms of high walls are different;the horizontal stress release leads to the rib spalling and stripping of high wall;the concept of load-bearing wall is put forward.The study results can provide reference to the design,construction and study for similar projects.
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