半岩半土隧道结构稳定性研究

发布时间：2018-05-15 23:15

本文选题：半岩半土隧道 + 围岩稳定性　；参考：《江苏科技大学》2014年硕士论文

【摘要】：近些年来，山陵地区的公路、铁路建设，已经越来越被重视。由于隧道工程的增多，修建区地形和地质条件也日益复杂，对设计、施工的要求更加严格，，这些因素就给隧道工程的建设带来了更高的要求。在隧道的设计和施工过程中，也会遇到岩层半硬半软的情况，论文中研究的半软半硬的围岩指的是：在隧道开挖时，开挖横断面一部分是岩体，一部分是土体（半岩半土）的情况。本文在归纳和分析国内外对于通道隧道开挖过程当中围岩稳定性研究的现状的基础上，以国道209线通道至青龙界公路改建工程通道隧道为背景，运用有限元程序ADINA进行非线性有限元模拟分析，并对比分析数值模拟的计算结果与现场监控数据，同时分析各影响因素对半岩半土围岩隧道结构位移和应力分布的影响规律，得到的结论对实际工程有着比较重要的参考价值，并且能够指导设计和优化施工，为以后的相近工程提出分析依据。主要工作包括：（1）对隧道围岩的变形和稳定性理论进行了描述，有限元模拟半岩半土隧道进行，讨论了其开挖前后的应力、应变状态。模拟过程中对隧道围岩进行3D实体模拟，以单元的生死模拟隧道的开挖与支护过程，进而分析动态施工时隧道围岩的变形规律及受力规律；（2）探讨隧道相对埋深、土岩交界线在掌子面的不同高度、有无支护、混凝土强度、混凝土厚度、有无锚杆、是否考虑地下水影响等影响因素对围岩、支护结构稳定的影响规律；（3）对比现场监测数据和数值模拟结果，并进行分析，尽管数值模拟结果与监测结果存在一定的误差，但基本上是符合的，验证了使用数值模拟研究半岩半土隧道结构稳定性的方法是可行的。
[Abstract]:In recent years, more and more attention has been paid to the construction of highways and railways in mountain areas. Due to the increase of tunnel engineering, the terrain and geological conditions of the construction area are becoming more and more complicated, and the requirements of design and construction are more stringent. These factors bring higher requirements to the construction of tunnel engineering. In the course of tunnel design and construction, it will also meet the situation of rock stratum semi-hard and half-soft. The semi-soft and semi-hard surrounding rock mass studied in this paper refers to: when the tunnel is excavated, part of the excavation cross section is rock mass. Part of the soil (half rock and half soil). On the basis of summing up and analyzing the present situation of the research on the stability of surrounding rock during tunnel excavation at home and abroad, this paper takes the channel tunnel of National Road 209-Line Tunnel to Azure Dragon Boundary Highway Reconstruction Project as the background. The nonlinear finite element simulation analysis is carried out by using the finite element program ADINA, and the calculation results of numerical simulation and field monitoring data are compared and analyzed. At the same time, the influence of various factors on the displacement and stress distribution of tunnel structure in half-rock and half-soil surrounding rock is analyzed. The conclusions obtained have important reference value for practical engineering, and can guide design and optimization construction, and provide analysis basis for similar projects in the future. The main tasks include: 1) the deformation and stability theory of surrounding rock of tunnel is described, and the stress and strain state before and after excavation are discussed by finite element simulation of half-rock and half-soil tunnel. In the process of simulation, 3D solid simulation of surrounding rock of tunnel is carried out, and the excavation and supporting process of tunnel is simulated with the birth and death of unit, and then the deformation law and force law of surrounding rock of tunnel during dynamic construction are analyzed. (2) discuss the influence law of the influence factors such as the relative buried depth of the tunnel, the different height of the boundary line of soil and rock in the face of the face, whether there is support, the strength of concrete, the thickness of concrete, whether there are anchors, whether the influence of groundwater is considered on the stability of the surrounding rock and the supporting structure; 3) comparing and analyzing the field monitoring data and the numerical simulation results. Although there are some errors between the numerical simulation results and the monitoring results, they are basically consistent with each other. It is proved that it is feasible to use numerical simulation to study the structural stability of half-rock and half-soil tunnel.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451

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