隧道洞口坡积土边仰坡变形控制与进洞技术研究

发布时间：2018-04-29 21:26

本文选题：隧道 + 边仰坡　；参考：《西安建筑科技大学》2015年硕士论文

【摘要】：隧道洞口边、仰坡常处于工程地质条件较差的地段,常伴有高边坡、大偏压埋深浅等不利因素,导致其在开挖后自稳能力较差,同时又受到隧道施工的影响,坡体易发生滑移破坏,对施工人员安全造成威胁并影响隧道工程的进行。因此隧道如何顺利安全进洞往往是隧道工程中的难点,而要保证隧道顺利安全进洞就要保证隧道洞口边、仰坡的稳定和隧道洞身的稳定,因此针对隧道施工过程中洞口边仰坡稳定性和洞身稳定性及二者之间的相互影响的研究就显得十分重要。本文以麻竹高速香山隧道为工程背景,通过数值模拟和现场监测数据对上述问题进行了研究和探讨,研究成果如下：根据隧址地质条件、地形地貌建立隧道洞口三维有限元模型,分析了隧道洞口边、仰坡在其开挖和隧道开挖过程中的位移、应力、应变变化趋势,总结了洞口边、仰坡位移场、应力场变化规律,给出了潜在滑移面位置,在此基础上提出了洞口边、仰坡优化治理方案。针对坡积土浅埋偏压隧道,分析了进洞工艺对隧道变形和洞口边仰坡变形的影响机理,研究了进洞工艺对洞身稳定性和洞口边仰坡稳定性的影响规律,对不同开挖工艺的优势与缺陷做了比较研究,总结了不同进洞工艺各自所适宜的地质条件和工程条件,同时总结了采用每种开挖工艺时所需要注意的问题,为隧道进洞采用合理的开挖工艺提供理论依据。通过分析现场监测数据,对隧道洞口段边、仰坡和洞内稳定性进行评价,总结其位移变化规律。证明了优化方案的合理性。同时通过对同断面实测数据和模拟数据相对比,总结其产生异同的原因,为更准确的解释数值模拟数据提供依据。
[Abstract]:At the edge of the tunnel entrance, the vertical slope is often located in the section with poor engineering geological conditions, often accompanied by high slope, large partial pressure buried depth and other adverse factors, resulting in its poor self-stability after excavation, and at the same time affected by the tunnel construction. Slippage is easy to occur in the slope, which threatens the safety of the constructors and affects the tunnel project. Therefore, how to enter the tunnel safely is often a difficult point in the tunnel engineering. However, to ensure the safe entry of the tunnel, it is necessary to ensure the stability of the side of the tunnel entrance, the stability of the vertical slope and the stability of the tunnel body. Therefore, it is very important to study the stability of the slope and the stability of the tunnel body and the interaction between them during the tunnel construction. In this paper, the problems mentioned above are studied and discussed by numerical simulation and field monitoring data. The research results are as follows: according to the geological conditions of the tunnel, The 3D finite element model of tunnel entrance is established by terrain and geomorphology. The variation trend of displacement, stress and strain in the excavation and excavation process of tunnel entrance and slope are analyzed, and the variation law of displacement field and stress field of tunnel entrance edge, vertical slope and stress field are summarized. The position of potential slip plane is given, and the optimal control scheme of hole edge and upside-slope is put forward on the basis of it. Aiming at the shallow buried bias pressure tunnel with sloping soil, the influence mechanism of the tunnel entry technology on the tunnel deformation and the slope deformation at the entrance of the tunnel is analyzed, and the influence law of the entry technology on the stability of the tunnel body and the slope of the side slope of the hole is studied. This paper makes a comparative study on the advantages and disadvantages of different excavation techniques, summarizes the geological conditions and engineering conditions suitable for different tunneling processes, and summarizes the problems to be paid attention to when adopting each kind of excavation technology. It provides a theoretical basis for the use of reasonable excavation technology in tunnel entry. Based on the analysis of monitoring data, the stability of tunnel orifice, vertical slope and tunnel is evaluated, and its displacement variation law is summarized. The rationality of the optimization scheme is proved. At the same time, by comparing the measured data of the same section with the simulated data, the causes of their similarities and differences are summarized, which provides the basis for more accurate interpretation of the numerical simulation data.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4

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