隧道穿越松散堆积体区域管棚系统力学特性研究
发布时间：2018-10-09 17:19
【摘要】：随着我国高速公路里程的增长，隧道建设的规模越来越大，特别是穿越松散堆积体区域的隧道。本文主要通过模型简化计算，结合有限元分析软件进行数值模拟，并利用隧道开挖过程中的监控量测，对隧道穿越松散堆积体区域管棚预支护的力学特性及支护参数进行研究，主要内容如下： ①对松散堆积体的物质组成、结构特点、变形特点、力学特性进行总结，并利用松散介质极限平衡理论对垂直均布围岩压力进行了简化计算，，推导了相应的计算公式。 ②对隧道超前预支护类型进行了总结，在管棚间距能保证管棚间土体成拱条件下对管棚进行了力学分析，推导了上覆岩土体传递给管棚荷载的简要计算公式。根据隧道开挖过程，假定管棚为双参数弹性地基梁模型，建立了相应的微分方程进行求解。分析了考虑土拱效应的管棚支护受力特性。 ③结合梵净山2号隧道管棚的不同预支护参数进行数值模拟分析，对管棚设计参数与隧道整体位移量及拱顶沉降量之间的关系进行分析，结合施工前超前地质预报、施工过程中的监控量测，对隧道施工与设计进行动态控制分析，根据相应分析结果对隧道管棚支护参数及支护措施作出了调整建议。
[Abstract]:With the increase of highway mileage in our country, the scale of tunnel construction is becoming larger and larger, especially the tunnel passing through loose accumulation area. In this paper, the mechanical properties and supporting parameters of pipe shed pre-support through loose accumulative area are studied by simplified model calculation, numerical simulation with finite element analysis software and monitoring measurement during tunnel excavation. The main contents are as follows: 1. The material composition, structural characteristics, deformation characteristics and mechanical properties of loose accumulations are summarized, and the pressure of vertical distributed surrounding rock is simplified by using the limit equilibrium theory of loose medium. The corresponding formulas are derived. 2. The types of advance pre-support of tunnel are summarized. The mechanical analysis of pipe shed is carried out under the condition that the spacing between pipes and sheds can ensure the soil arched between pipes, and the formula for calculating the load transferred from overburden rock to pipe shed is deduced. According to the tunnel excavation process, the pipe shed is assumed to be a two-parameter elastic foundation beam model, and the corresponding differential equation is established to solve the problem. The mechanical characteristics of pipe-shed support considering soil arch effect are analyzed. Based on the numerical simulation analysis of different pre-supporting parameters of pipe shed in Fanjingshan No. 2 tunnel, the relationship between the design parameters of pipe shed and the total displacement of tunnel and the settlement of arch roof is analyzed, and the geological forecast ahead of construction is combined with the analysis of the relationship between the design parameters of pipe shed and the total displacement of tunnel and the settlement of arch roof. The dynamic control analysis of tunnel construction and design is carried out by monitoring and measuring during construction. According to the corresponding analysis results, some suggestions are made for the adjustment of the support parameters and supporting measures of the tunnel pipe-shed.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.49;U456.3
本文编号：2260138
[Abstract]:With the increase of highway mileage in our country, the scale of tunnel construction is becoming larger and larger, especially the tunnel passing through loose accumulation area. In this paper, the mechanical properties and supporting parameters of pipe shed pre-support through loose accumulative area are studied by simplified model calculation, numerical simulation with finite element analysis software and monitoring measurement during tunnel excavation. The main contents are as follows: 1. The material composition, structural characteristics, deformation characteristics and mechanical properties of loose accumulations are summarized, and the pressure of vertical distributed surrounding rock is simplified by using the limit equilibrium theory of loose medium. The corresponding formulas are derived. 2. The types of advance pre-support of tunnel are summarized. The mechanical analysis of pipe shed is carried out under the condition that the spacing between pipes and sheds can ensure the soil arched between pipes, and the formula for calculating the load transferred from overburden rock to pipe shed is deduced. According to the tunnel excavation process, the pipe shed is assumed to be a two-parameter elastic foundation beam model, and the corresponding differential equation is established to solve the problem. The mechanical characteristics of pipe-shed support considering soil arch effect are analyzed. Based on the numerical simulation analysis of different pre-supporting parameters of pipe shed in Fanjingshan No. 2 tunnel, the relationship between the design parameters of pipe shed and the total displacement of tunnel and the settlement of arch roof is analyzed, and the geological forecast ahead of construction is combined with the analysis of the relationship between the design parameters of pipe shed and the total displacement of tunnel and the settlement of arch roof. The dynamic control analysis of tunnel construction and design is carried out by monitoring and measuring during construction. According to the corresponding analysis results, some suggestions are made for the adjustment of the support parameters and supporting measures of the tunnel pipe-shed.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.49;U456.3
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