【作者】 祁洪；

【导师】 葛克水；

【作者基本信息】 中国地质大学（北京） ， 地质工程， 2007， 硕士

【摘要】 随着我国高等级公路和地铁建设的快速发展,各种交通隧道特别是大跨度隧道也越来越多。隧道施工过程中,洞室周围岩体发生应力重分布作用,当这种重分布应力超过围岩的强度极限时,将造成围岩的失稳破坏。因此,隧道施工过程中洞室围岩稳定性评价的研究显得日益重要。本文通过大量的文献资料,论述了大跨度隧道围岩稳定的理论分析过程;针对围岩自身稳定特点,分析了影响其稳定的主要因素,在此基础上选取对隧道围岩稳定性影响较大的开挖方式这一因素,运用有限元程序ANSYS结合具体工程进行数值模拟,并对计算结果中的围岩应力场和位移场进行分析,分析结果显示对于大跨度软弱围岩隧道工程采取合理的开挖方法及支护措施就能保证围岩稳定。围岩监控量测是隧道施工中非常重要的一环,在分析基本量测项目及目前常用围岩稳定准则的基础上,得出了几点有益的结论。隧道拱顶下沉是隧道围岩力学行为的最直观体现,也是隧道施工监控量测最主要的项目这一明显特点,通过对拱顶下沉量测结果的分析,得出围岩稳定的结论。更多还原

【Abstract】 With the rapid development of the highway and subway construction, there are more and more tunnels, especially large-span tunnels. In the course of the tunnel’s construction, the stress in rock mass will redistribute around grotto,When this kind stress exceeds surrounding rock’s ultimate strength, surrounding rock will lose its stability and destruct. Consequently, it becomes increasingly important for the study of stability of surrounding rock during the construction of tunnels.Based on a great deal of material,this thesis discusses the theories analysis process of the surrounding rock. Aimed at the characteristics of the stability of the surrounding rock, analysis the main factors to affect it’s stabilty, on this basis,select the factors of different excavations that affect to the surrounding rock stabilty deeply, make use of the ANSYS procedure carry on the numberical imitation to combining the concrete engineering,and analyse the stress field and the displacement field of the surrounding-rock draw a conclusion that by take reasonable excavation methods and support measures will be enough to ensure the stability of surrounding rock. The construction monitoring is the most important part during the construction of tunnels, based on the analyse the basic measured items and the currently stability standard of the surrounding rock, get some beneficial conclusions. As to the character that the tunnel arch crest sink is the view body of the tunnel surrounding rock mechanics behavior,and also to the most important item, through anlysis of the measured result of the arch crest sink ,draw the conclusion that the stability of the surrounding rock.更多还原