大干溪Ⅰ号隧道软弱围岩大变形机理及其处治技术研究

发布时间：2018-06-20 20:47

本文选题：隧道软弱围岩 + 大变形机理　；参考：《长沙理工大学》2015年硕士论文

【摘要】：近年来,随着我国西部大开发战略实施的不断深入,山岭隧道越来越多的出现在高速公路的修建中,而其中软岩隧道大变形的问题也屡见不鲜。虽然软弱围岩隧道大变形的问题由来已久,但仍然事故频发,主要原因还是软弱围岩的地质条件复杂,工程参建单位对软弱围岩大变形问题认识不足,缺乏相关技术指导和具体的应对措施。对于隧道工程的质量、工期、建设成本和运营安全来说,研究隧道软弱围岩大变形及相应的处治技术具有非常重要的工程价值。本文结合龙永高速大干溪Ⅰ号隧道工程,借助数值模拟软件和现场监测数据,研究在地质条件复杂情况下,隧道软弱破碎围岩的水平收敛、洞内沉降及其处治技术,文章的主要内容如下:(1)参考国内外的有关文献和资料,分析了软弱围岩隧道大变形的破坏类型、形成机理及影响因素;(2)结合相关资料,对大干溪Ⅰ号隧道左线ZK66+790~ZK66+815变形较大区段,选取典型断面进行了施工开挖的数值模拟,对比分析了实际采用的台阶法和设计书中的预留核心土法施工对浅埋偏压的软弱围岩隧道有何异同;(3)描述了现场监控量测技术的实施,并对监测数据进行分析处理,再基于现场监测数据和模拟结果的对比,对浅埋偏压的软岩隧道大变形的机理进行分析探讨;(4)总结了造成隧道软弱围岩发生大变形的一些主要原因,针对大干溪Ⅰ号隧道软弱围岩大变形区段的处治方案进行了探讨,给出了此类软弱围岩条件下隧道施工对策及注意事项,并对开挖及支护方案进行了优化分析。本文的探讨研究的应用为大干溪Ⅰ号隧道及类似的地下工程的建设提供了理论上的一些依据,同时也可为后续的类似工程地质条件下隧道工程提供设计和施工经验,具有较好的工程参考价值。
[Abstract]:In recent years, with the implementation of the strategy of western development in China, more and more mountain tunnels appear in the construction of highway, and the problem of large deformation of soft rock tunnels is common. Although the problem of large deformation of soft surrounding rock tunnel has existed for a long time, accidents still occur frequently, the main reason is that the geological conditions of soft surrounding rock are complex, and the engineering participating units do not know enough about the problem of large deformation of weak surrounding rock. Lack of relevant technical guidance and specific response measures. For the quality, construction period, construction cost and operation safety of tunnel engineering, it is very important to study the large deformation of tunnel soft surrounding rock and the corresponding treatment technology. In this paper, with the aid of numerical simulation software and field monitoring data, the horizontal convergence, settlement and treatment technology of weak and broken surrounding rock of the tunnel under complex geological conditions are studied, in combination with the Longyong Expressway Daganxi I Tunnel Project, with the help of numerical simulation software and field monitoring data. The main contents of this paper are as follows: (1) referring to relevant literature and data at home and abroad, the failure types, formation mechanism and influencing factors of large deformation of soft surrounding rock tunnel are analyzed. For the section of ZK66790 ZK66815 with large deformation on the left line of Daganxi I Tunnel, the typical section is selected to carry out numerical simulation of construction and excavation. This paper compares and analyzes the differences and similarities between the actual application of the bench method and the reserved core earth method in the design document for the soft surrounding rock tunnel with shallow burying bias pressure, and describes the implementation of the on-site monitoring and measurement technology, and analyzes and deals with the monitoring data. Based on the comparison of field monitoring data and simulation results, the mechanism of large deformation of soft rock tunnel with shallow bias pressure is analyzed and discussed. This paper probes into the treatment scheme of large deformation section of weak surrounding rock in Daganxi I tunnel, puts forward the construction countermeasures and matters needing attention under this kind of soft surrounding rock condition, and optimizes the excavation and support scheme. The application of this paper provides some theoretical basis for the construction of Daganxi I Tunnel and similar underground projects, and also provides the design and construction experience for the tunnel engineering under similar engineering geological conditions. It has good engineering reference value.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.49

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