下穿隧道施工对山区高速公路路基稳定性影响的研究
发布时间：2018-11-07 08:18
【摘要】：随着我国“四纵四横”的高铁建设规划，铁路隧道的建设也日益增多，从而遇到了越来越多的技术难题。下穿隧道因为其技术难度大，不确定因素多，事故影响严重等特点，引起了国内外专家学者的关注。 本文以贵州省六盘水市盘县的背阴坡隧道为研究背景，通过理论分析、现场监控量测、数值模拟和风险分析等方法相结合，研究和探讨下穿隧道施工对山区高速公路路基稳定性的影响，为确保工程的安全提供依据。主要研究工作和成果如下： ①通过对背阴坡隧道下穿断面的监控量测成果进行分析，，得出了下穿隧道施工引起的实际地表沉降的变化规律。 ②借助软件MIDAS GTS建立并分析了处于3种不同位置的下穿隧道有限元计算模型，结果表明随着隧道向边坡坡脚方向移动，公路路基的沉降量逐渐减小，而边坡的稳定性逐渐降低。 ③建立并分析了不同开挖方案的下穿隧道有限元计算模型，结果表明山区公路路基的稳定性随着开挖进尺的减小而提高，侧壁导坑法效果最好，台阶法次之，全断面法对稳定性影响最大。 ④对27个下穿隧道开挖施工算例进行分析，研究下穿隧道开挖施工对山区高速公路路基稳定性的控制基准，并利用专业贝叶斯软件Netica建立下穿隧道开挖施工风险分析模型，结果表明下穿隧道的开挖方法与下穿隧道施工风险关系最密切。 ⑤分析了下穿隧道开挖对公路路基和边坡稳定性的影响机理，并针对背阴坡隧道的开挖施工对路基和边坡稳定性影响的控制措施提出了建议。
[Abstract]:With the construction planning of "four vertical and four horizontal" high-speed railway in our country, the construction of railway tunnel is increasing day by day, so more and more technical problems are encountered. The underpass tunnel has attracted the attention of experts and scholars at home and abroad because of its technical difficulty, many uncertain factors and serious impact of accidents. In this paper, based on the research background of Yuyin slope tunnel in Pan County, Liupanshui City, Guizhou Province, the methods of theoretical analysis, on-site monitoring and measurement, numerical simulation and risk analysis are combined. This paper studies and discusses the influence of underpass tunnel construction on the stability of highway roadbed in mountainous area, which provides the basis for ensuring the safety of the project. The main research work and results are as follows: 1 through the analysis of the monitoring and measuring results of the underpass section of the tunnel, the variation law of the actual surface subsidence caused by the construction of the downhill tunnel is obtained. (2) the finite element model of underpass tunnel in three different positions is established and analyzed with the help of software MIDAS GTS. The results show that the settlement of highway subgrade decreases gradually and the stability of slope decreases with the direction of tunnel moving towards the foot of the slope. (3) the finite element calculation model of underpass tunnel with different excavation schemes is established and analyzed. The results show that the stability of highway roadbed in mountainous area increases with the decrease of excavation scale, the effect of sidewall guide pit method is the best, and the step method takes the second place. The full section method has the greatest effect on stability. (4) analyze 27 examples of underpass tunnel excavation, study the control benchmark of underpass tunnel excavation to highway roadbed stability in mountainous area, and use professional Bayesian software Netica to set up the risk analysis model of underpass tunnel excavation. The results show that the excavation method of the underpass tunnel is most closely related to the construction risk of the underpass tunnel. 5. The influence mechanism of tunnel excavation on the stability of roadbed and slope is analyzed, and some suggestions are put forward to control the influence of tunnel excavation on the stability of roadbed and slope.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4;U416.1
本文编号：2315750
[Abstract]:With the construction planning of "four vertical and four horizontal" high-speed railway in our country, the construction of railway tunnel is increasing day by day, so more and more technical problems are encountered. The underpass tunnel has attracted the attention of experts and scholars at home and abroad because of its technical difficulty, many uncertain factors and serious impact of accidents. In this paper, based on the research background of Yuyin slope tunnel in Pan County, Liupanshui City, Guizhou Province, the methods of theoretical analysis, on-site monitoring and measurement, numerical simulation and risk analysis are combined. This paper studies and discusses the influence of underpass tunnel construction on the stability of highway roadbed in mountainous area, which provides the basis for ensuring the safety of the project. The main research work and results are as follows: 1 through the analysis of the monitoring and measuring results of the underpass section of the tunnel, the variation law of the actual surface subsidence caused by the construction of the downhill tunnel is obtained. (2) the finite element model of underpass tunnel in three different positions is established and analyzed with the help of software MIDAS GTS. The results show that the settlement of highway subgrade decreases gradually and the stability of slope decreases with the direction of tunnel moving towards the foot of the slope. (3) the finite element calculation model of underpass tunnel with different excavation schemes is established and analyzed. The results show that the stability of highway roadbed in mountainous area increases with the decrease of excavation scale, the effect of sidewall guide pit method is the best, and the step method takes the second place. The full section method has the greatest effect on stability. (4) analyze 27 examples of underpass tunnel excavation, study the control benchmark of underpass tunnel excavation to highway roadbed stability in mountainous area, and use professional Bayesian software Netica to set up the risk analysis model of underpass tunnel excavation. The results show that the excavation method of the underpass tunnel is most closely related to the construction risk of the underpass tunnel. 5. The influence mechanism of tunnel excavation on the stability of roadbed and slope is analyzed, and some suggestions are put forward to control the influence of tunnel excavation on the stability of roadbed and slope.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4;U416.1
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