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在对国内外现行隧道围岩分级方法分析的基础上,指出了其在隧道工程设计和安全性控制,尤其是复杂围岩控制设计方面存在的突出问题,认为现行的隧道围岩分级概念模糊,难以适应复杂多变的地层条件和较为严苛的环境控制要求,尤其是对稳定性较差的复杂围岩条件缺乏有效的指导作用。从隧道围岩控制的宗旨出发,提出了隧道围岩及其支护系统安全性的概念,明确了其科学内涵和表征方法;重点对于不具备自稳能力的复杂围岩安全性进行了研究,建立了隧道围岩安全性的分析模型,提出了隧道围岩安全性分析中应考虑围岩预加固效果的必要性及其评价方法;基于隧道围岩尺度效应和地层结构效应(时间效应)的分析,建立了围岩尺度响应的表述方法,同时从细观结构层面分析了不同地层结构形式对安全性的影响关系;结合“支护–围岩”动态作用关系的分析,建立了极不稳定地层条件下复杂隧道围岩安全性的评价指标体系,将围岩超前变形、超前破坏和地层加固有效性作为核心评价指标,形成了包括9项基础指标的评价体系,并提出了安全性的分级方法。最后介绍了隧道围岩安全性的分级方案的工程应用。
Based on the analysis of the surrounding rock classification methods at home and abroad, the prominent problems in tunnel engineering design and safety control, especially in the design of complex surrounding rock control are pointed out. The current classification concept of surrounding rock mass is vague, It is difficult to adapt to complex and changeable formation conditions and more stringent environmental control requirements, especially for the poor stability of complex rock conditions lack of effective guidance. Based on the purpose of tunnel surrounding rock control, the concept of tunnel surrounding rock and its supporting system safety is put forward, and the scientific connotation and characterization method are clarified. The safety of complex surrounding rock without self - The analysis model of tunnel surrounding rock safety is established. The necessity and evaluation method of surrounding rock pre-reinforcement should be considered in the analysis of tunnel surrounding rock safety. Based on the tunnel scale effect and stratigraphic structure effect (time effect) Based on the analysis of the dynamic response of the surrounding rock mass and its relationship with the safety of different strata structures, the method of describing the scale response of the surrounding rock is established. At the same time, The evaluation index system for the safety of surrounding rock of complex tunnels in unstable stratum is taken as the core evaluation index, which includes the advanced evaluation of surrounding rock deformation, advanced destruction and strata reinforcement. The evaluation system includes nine basic indexes and the safety evaluation Grading method. Finally, the engineering application of the classification scheme of tunnel surrounding rock safety is introduced.