复杂隧道围岩安全性及其评价方法

发布时间：2018-04-05 08:23

本文选题：隧道工程　切入点：隧道围岩　出处：《岩石力学与工程学报》2017年02期

【摘要】：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。
[Abstract]:Based on the analysis of the existing classification methods of tunnel surrounding rock at home and abroad, this paper points out the outstanding problems in tunnel engineering design and safety control, especially in the control design of complex surrounding rock, and considers that the current concept of tunnel surrounding rock classification is fuzzy.It is difficult to adapt to the complex and changeable formation conditions and strict environmental control requirements, especially for the complex surrounding rock conditions with poor stability.Based on the purpose of tunnel surrounding rock control, this paper puts forward the concept of safety of tunnel surrounding rock and its supporting system, and clarifies its scientific connotation and representation method.The analysis model of tunnel surrounding rock safety is established, and the necessity and evaluation method of considering the effect of surrounding rock pre-reinforcement in the analysis of tunnel surrounding rock safety are put forward, based on the analysis of tunnel surrounding rock scale effect and stratum structure effect (time effect).The expression method of the scale response of surrounding rock is established, and the influence of different formation structure forms on safety is analyzed from the view of mesoscopic structure, and the dynamic action relation of "supporting surrounding rock" is analyzed.An evaluation index system for the safety of the surrounding rock of complex tunnel under extremely unstable strata is established. The core evaluation index is the advance deformation, the advance failure and the reinforcement effectiveness of the surrounding rock, and the evaluation system includes 9 basic indexes.The classification method of safety is put forward.Finally, the engineering application of the classification scheme of tunnel surrounding rock safety is introduced.
【作者单位】：北京交通大学城市地下工程教育部重点实验室;
【基金】：国家自然科学基金重点项目(U1234210)~~
【分类号】：U451.2

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