【摘要】 双轴应力状态是地下洞室群洞周围岩的一种典型受力形态。针对开挖卸载下围岩的破坏机理及流变特性,结合现有岩样试验以及相关的理论模型,从岩样的加载破坏、岩石的蠕变效应以及围岩的卸载机制等方面进行了总结与归纳,并对深部地下洞室开挖过程中围岩发生的岩爆和劈裂破坏现象进行了综述。分析评价了双轴应力状态下围岩的力学特性研究成果以及最新进展,同时指出目前研究中存在的问题和进一步研究的方向。更多还原

【Abstract】 Biaxial stress field is one of the classical stressed states of surrounding rock in underground group caverns.Considering the failure mode and the rheological properties of surrounding rock under excavation unloading,the characteristics of loading failure,creep effect and unloading mechanism are summarized and induced by the present rock sample test and related theoretical models.The phenomena of rock burst and splitting failure,observed in the deep excavating processes of the underground cavern,are also reviewed in this paper.In addition,we analyze and evaluate the achievements about mechanical characteristics of surrounding rock in biaxial stress state.The problems on study at present and the research direction in next stage are pointed out at last.更多还原