小坝田隧道支护结构优化及二次衬砌施作时机研究
发布时间：2019-05-14 23:01
【摘要】：近年来，我国高速公路与铁路建设事业发展迅速，其中破碎岩质隧道工程在隧道施工中所占比例也逐渐增加，但是在破碎岩质隧道设计施工过程中也暴露出了越来越多的问题，比如支护结构参数选择难、支护施作时机确定难等，这些难题一直困扰着破碎岩质隧道支护技术应用与发展。 首先，本文总结了国内外破碎岩质隧道支护理论的发展，阐述了此类工程施工特性、破碎岩质隧道变形和失稳的力学机制、破碎岩质隧道支护作用机理、破碎岩质隧道支护优化理论，在此基础上应用MIDAS/GTS有限元软件以破碎岩质隧道为研究对象，通过建立三维有限元模型模拟了该破碎岩质隧道开挖和支护全过程，主要分析了破碎岩质隧道支护结构中喷射混凝土强度等级对破碎岩质隧道围岩开挖变形及喷射混凝土轴应力的影响、锚杆支护参数（锚杆长度、直径、间排距）对破碎岩质隧道围岩开挖变形及锚杆轴力的影响、钢拱架支护参数（钢拱架间距、型钢型号）并对破碎岩质隧道围岩开挖变形及钢拱架轴力的影响、二次衬砌混凝土强度等级及混凝土厚度对破碎岩质隧道围岩后期变形及二衬轴应力的影响。在此基础上本文对支护结构参数及支护方式进行了优化研究，提出了该破碎岩质隧道的最优支护参数和支护方式。 其次，本文阐明了二次衬砌最佳施作时机的提出及发展历程，阐述了二次衬砌最佳施作时机的各种判定标准及判定方法，并结合实际工程的监控量测数据，以最能直观反映围岩变形情况的围岩变形位移量和最能直观反映围岩应力释放的初期支护各结构的应力应变变化规律为主要控制参数，对破碎岩质隧道二次衬砌支护的施作时机进行深入研究，得到了该破碎岩质隧道在原支护结构设计条件下二衬的最优施作时机，并在此理论基础上利用前期本隧道优化后的各支护结构参数值通过数值模拟，最终确定该隧道在最优支护参数和支护方式条件下二衬的最优施作时机。以上研究成果可为类似地质条件下软弱围岩隧道的设计和施工提供科学的理论依据和指导作用。
[Abstract]:In recent years, highway and railway construction in China has developed rapidly, in which the proportion of broken rock tunnel engineering in tunnel construction has gradually increased, but more and more problems have been exposed in the design and construction process of broken rock tunnel. For example, it is difficult to select the parameters of supporting structure and to determine the timing of supporting. These problems have been perplexing the application and development of support technology for broken rock tunnel. First of all, this paper summarizes the development of broken rock tunnel support theory at home and abroad, expounds the construction characteristics of this kind of engineering, the mechanical mechanism of deformation and instability of broken rock tunnel, and the supporting mechanism of broken rock tunnel. Based on the optimization theory of broken rock tunnel support, the whole process of excavation and support of broken rock tunnel is simulated by establishing three-dimensional finite element model by using MIDAS/GTS finite element software to take broken rock tunnel as the research object. This paper mainly analyzes the influence of shotcrete strength grade on the excavation deformation and axial stress of shotcrete in the supporting structure of broken rock tunnel, and the parameters of bolt support (bolt length, diameter, etc.) The influence of steel arch frame support parameters (steel arch frame spacing, section steel type) on the excavation deformation and axial force of steel arch frame in the surrounding rock of broken rock tunnel, and the influence of steel arch frame support parameters (steel arch frame spacing, section steel type) on the excavation deformation and axial force of steel arch frame of broken rock tunnel. Effect of strength grade and concrete thickness of secondary lining concrete on deformation of surrounding rock and stress of secondary lining shaft in broken rock tunnel. On this basis, the parameters and supporting methods of the supporting structure are optimized, and the optimal supporting parameters and supporting methods of the broken rock tunnel are put forward. Secondly, this paper expounds the proposal and development course of the best operation time of the secondary lining, expounds various criteria and methods of determining the best operation time of the secondary lining, and combines the monitoring and measurement data of the actual project. The deformation displacement of surrounding rock, which can reflect the deformation of surrounding rock, and the variation of stress and strain of each structure in the initial supporting structure, which can reflect the stress release of surrounding rock, are taken as the main control parameters. The application time of the secondary lining support of the broken rock tunnel is deeply studied, and the optimal operation time of the second lining of the broken rock tunnel under the original supporting structure design condition is obtained. On the basis of this theory, the optimal operation time of the second lining under the condition of the optimal support parameters and supporting mode of the tunnel is finally determined by numerical simulation with the parameters of the supporting structure optimized in the early stage of the tunnel. The above research results can provide scientific theoretical basis and guidance for the design and construction of weak surrounding rock tunnel under similar geological conditions.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.91
本文编号：2477116
[Abstract]:In recent years, highway and railway construction in China has developed rapidly, in which the proportion of broken rock tunnel engineering in tunnel construction has gradually increased, but more and more problems have been exposed in the design and construction process of broken rock tunnel. For example, it is difficult to select the parameters of supporting structure and to determine the timing of supporting. These problems have been perplexing the application and development of support technology for broken rock tunnel. First of all, this paper summarizes the development of broken rock tunnel support theory at home and abroad, expounds the construction characteristics of this kind of engineering, the mechanical mechanism of deformation and instability of broken rock tunnel, and the supporting mechanism of broken rock tunnel. Based on the optimization theory of broken rock tunnel support, the whole process of excavation and support of broken rock tunnel is simulated by establishing three-dimensional finite element model by using MIDAS/GTS finite element software to take broken rock tunnel as the research object. This paper mainly analyzes the influence of shotcrete strength grade on the excavation deformation and axial stress of shotcrete in the supporting structure of broken rock tunnel, and the parameters of bolt support (bolt length, diameter, etc.) The influence of steel arch frame support parameters (steel arch frame spacing, section steel type) on the excavation deformation and axial force of steel arch frame in the surrounding rock of broken rock tunnel, and the influence of steel arch frame support parameters (steel arch frame spacing, section steel type) on the excavation deformation and axial force of steel arch frame of broken rock tunnel. Effect of strength grade and concrete thickness of secondary lining concrete on deformation of surrounding rock and stress of secondary lining shaft in broken rock tunnel. On this basis, the parameters and supporting methods of the supporting structure are optimized, and the optimal supporting parameters and supporting methods of the broken rock tunnel are put forward. Secondly, this paper expounds the proposal and development course of the best operation time of the secondary lining, expounds various criteria and methods of determining the best operation time of the secondary lining, and combines the monitoring and measurement data of the actual project. The deformation displacement of surrounding rock, which can reflect the deformation of surrounding rock, and the variation of stress and strain of each structure in the initial supporting structure, which can reflect the stress release of surrounding rock, are taken as the main control parameters. The application time of the secondary lining support of the broken rock tunnel is deeply studied, and the optimal operation time of the second lining of the broken rock tunnel under the original supporting structure design condition is obtained. On the basis of this theory, the optimal operation time of the second lining under the condition of the optimal support parameters and supporting mode of the tunnel is finally determined by numerical simulation with the parameters of the supporting structure optimized in the early stage of the tunnel. The above research results can provide scientific theoretical basis and guidance for the design and construction of weak surrounding rock tunnel under similar geological conditions.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.91
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