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为了解决在岩石工程领域中的基于地质力学的岩体评级方法只适用于浅部岩层,而在大埋深、高应力环境中出现不适应性这一问题而展开研究,首先,从RMR分类方法入手,通过引入能较好反映岩体质量的岩体块度指数,并考虑地应力的影响,对传统的RMR分类方法进行改进,以确定出改进后的评估值RMRnew;其次,基于RMRnew确定出隧道支护体系的作用荷载,并对支护体系进行分析,确定其极限承载能力;最后,基于荷载-结构法构建起隧道稳定性分析框架,并对隧道安全状态进行评估。对工程实例进行分析发现,基于改进后的RMR分类方法所得到的分析结果与实际情况相符,说明地应力、岩块尺寸以及埋深等对隧道稳定性有明显影响。
In order to solve the problem that the geomechanical-based rock mass rating method in rock engineering is only applicable to shallow rock strata, but not adaptability in deep burial and high-stress environment, firstly, from the RMR classification method Then the traditional RMR classification method is improved to determine the improved evaluation value RMRnew by introducing the block index of rock mass which can better reflect the rock mass quality and considering the influence of in-situ stress. Secondly, based on RMRnew, The supporting load of the tunnel supporting system and the supporting system are analyzed to determine its ultimate bearing capacity. Finally, the tunnel stability analysis framework is built based on the load-structure method and the tunnel safety status is evaluated. The analysis of engineering examples shows that the analysis results based on the improved RMR classification method are consistent with the actual situation, indicating that the stress of the rock, the size of the rock block and the depth of the tunnel have a significant impact on the stability of the tunnel.