小寨隧道软弱围岩段特征及施工方案比选研究
发布时间：2019-04-28 07:53
【摘要】：近年来,随着我国经济水平和综合国力的提升,国内基础设施建设得到了迅速的发展,大批长大隧道在地质条件复杂的西部山岭地区修建。由于大部分山岭地区地质条件复杂多变,隧道修建过程常常会碰到强度低、自稳能力差的软弱围岩或破碎带,施工时常常由于开挖方法、支护参数或施工管理不当而造成塌方冒顶、围岩大变形或支护结构失稳,致使工期延后和投资增加。因此,系统研究分析遇到的软弱围岩类型、变形特征对合理选择施工方案至关重要。本论文依托云桂铁路小寨隧道工程,在分析小寨隧道软弱围岩特点的基础上,提出了适合软弱围岩施工的四个方案,并从施工安全、质量、费用、难易程度及施工进度5个角度对四种方案进行了比较；最后运用层次分析法建立数学模型,定量评价了四种方案的合理性,从而确定了该软弱围岩段最佳施工方案为三台阶七步法。
[Abstract]:In recent years, with the improvement of China's economic level and comprehensive national strength, the construction of domestic infrastructure has been rapidly developed. A large number of long and large tunnels have been built in the mountainous region of the western part of China with complex geological conditions. Because the geological conditions in most mountain areas are complex and changeable, the tunnel construction process will often encounter weak surrounding rock or broken zone with low strength and poor self-stabilization ability, and often due to excavation method during construction. Improper support parameters or construction management lead to collapse and roof fall, large deformation of surrounding rock or instability of support structure, resulting in delay of construction period and increase of investment. Therefore, it is very important to study and analyze the types of weak surrounding rock and the deformation characteristics in order to select the construction scheme reasonably. Based on the analysis of the characteristics of weak surrounding rock in Xiaozhai Tunnel of Yungui Railway, this paper puts forward four schemes suitable for the construction of weak surrounding rock, and from the aspects of construction safety, quality and cost, the paper puts forward four schemes for the construction of weak surrounding rock. The difficulty degree and construction schedule are compared with each other from five angles. Finally, the mathematical model is established by the analytic hierarchy process (AHP), and the rationality of the four schemes is quantitatively evaluated, thus the optimum construction scheme for the weak surrounding rock is determined to be three steps and seven steps.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.49
本文编号：2467458
[Abstract]:In recent years, with the improvement of China's economic level and comprehensive national strength, the construction of domestic infrastructure has been rapidly developed. A large number of long and large tunnels have been built in the mountainous region of the western part of China with complex geological conditions. Because the geological conditions in most mountain areas are complex and changeable, the tunnel construction process will often encounter weak surrounding rock or broken zone with low strength and poor self-stabilization ability, and often due to excavation method during construction. Improper support parameters or construction management lead to collapse and roof fall, large deformation of surrounding rock or instability of support structure, resulting in delay of construction period and increase of investment. Therefore, it is very important to study and analyze the types of weak surrounding rock and the deformation characteristics in order to select the construction scheme reasonably. Based on the analysis of the characteristics of weak surrounding rock in Xiaozhai Tunnel of Yungui Railway, this paper puts forward four schemes suitable for the construction of weak surrounding rock, and from the aspects of construction safety, quality and cost, the paper puts forward four schemes for the construction of weak surrounding rock. The difficulty degree and construction schedule are compared with each other from five angles. Finally, the mathematical model is established by the analytic hierarchy process (AHP), and the rationality of the four schemes is quantitatively evaluated, thus the optimum construction scheme for the weak surrounding rock is determined to be three steps and seven steps.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.49
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