层状碎裂围岩特大断面换装硐室施工性态及稳定性分析

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Abstract 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.

Key words： rock mechanics bedded and cataclastic reloading chamber with large cross-section construction behavior load-bearing wall stability

Received: 17 March 2010

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http://www.rockmech.org/EN/Y2010/V29/I11/2293

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