摘 要

二次衬砌是在初期支护的条件下进行的混凝土浇筑，与初期支护结构共同组成为复合式衬砌，之间还应该增设防水层，初期支护与二次衬砌的贴紧程度直接影响到复合式衬砌的受力情况，应当保证其紧贴，使得可以看做一个组合结构。本文通过包家山和明垭子公路隧道为分析目标，通过查阅资料得到衬砌分担比例，为之后二次围岩压力与变形分析打下基础。

通过对包家山和明垭子公路隧道的分析，，得到的结果如下：

1. 通过对岩质隧道IV、V级围岩的分析，得知二次衬砌分担围岩压力比例的平均值分别为23.5%、37.9%
2. 通过对IV级岩质隧道的应力分析，可以知道在侧向变形系数为0.15时，该隧道的左墙脚、右墙脚、左边拱腰的受力很大，应力比较集中。Ⅳ级岩质隧道的水平变形量，大部分大变形都发生在拱腰位置。
3. 通过对V级岩质隧道的应力分析，可以知道在侧向变形系数为0.3时，该隧道左墙脚、右墙脚和左拱拱腰受力大，整个截面受压。V级岩质隧道的竖向变形，最大变形处位于拱顶，整个截面的竖向变形都是压缩变形。
4. 通过对这两个隧道的分析，得出IV级围岩的最大应力为6.22MPa，V级围岩的最大应力为9.78MPa，隧道的底部受小，拱顶、拱脚以及拱腰的位置应力都比较大并且这两个最大应力都小于C25混凝土的设计强度，说明隧道工程时安全的。

关键词：二次衬砌；围岩压力；变形 ；公路隧道

Abstract

The two lining is the concrete pouring under the condition of the initial support, which is composed of the composite lining with the initial support structure, and the waterproof layer should be added between the lining. The initial support and the tightness of the two lining are directly affected by the stress situation of the composite lining. It should be kept tight, so that it can be regarded as a group. Combined structure. In this paper, by analyzing the share proportion of the lining through the data of the Bao Jiashan and Ming Ya Zi highway tunnels, the foundation for the analysis of the two surrounding rock pressure and deformation is laid.

通过对包家山和明垭子公路隧道的分析，，得到的结果如下：

Through the analysis of the tunnel of Bao Jiashan and Ming Ya Zi, the results are as follows:

1. 通过对岩质隧道IV、V级围岩的分析，得知二次衬砌分担围岩压力比例的平均值分别为23.5%、37.9%

1. through the analysis of IV and V grade surrounding rock of rock tunnel, it is known that the average value of the pressure ratio shared by the two lining is 23.5% and 37.9% respectively.

2. 通过对IV级岩质隧道的应力分析，可以知道在侧向变形系数为0.15时，该隧道的左墙脚、右墙脚、左边拱腰的受力很大，应力比较集中。Ⅳ级岩质隧道的水平变形量，大部分大变形都发生在拱腰位置。

2. through the stress analysis of the IV grade rock tunnel, it is known that when the lateral deformation coefficient is 0.15, the left wall foot, the right wall foot and the left arch waist are strongly stressed, and the stress is more concentrated. The horizontal deformation of grade IV rock tunnel, most of the large deformation occurs in the arch waist position.

3.通过对V级岩质隧道的应力分析，可以知道在侧向变形系数为0.3时，该隧道左墙脚、右墙脚和左拱拱腰受力大，整个截面受压。V级岩质隧道的竖向变形，最大变形处位于拱顶，整个截面的竖向变形都是压缩变形。

3. through the stress analysis of the V grade rock tunnel, it is known that when the lateral deformation coefficient is 0.3, the left wall foot, the right wall foot and the left arch waist are subjected to large force, and the whole cross section is compressed. The vertical deformation of V grade rock tunnel is located at the dome, and the vertical deformation of the whole section is compression deformation.

4.通过对这两个隧道的分析，得出IV级围岩的最大应力为6.22MPa，V级围岩的最大应力为9.78MPa，隧道的底部受小，拱顶、拱脚以及拱腰的位置应力都比较大并且这两个最大应力都小于C25混凝土的设计强度，说明隧道工程时安全的。

4. through the analysis of the two tunnels, the maximum stress of the IV class surrounding rock is 6.22MPa, the maximum stress of the V class surrounding rock is 9.78MPa, the bottom of the tunnel is small, the position stress of the vault, arch foot and the arch waist are relatively large and the two maximum stresses are less than the setting strength of the C25 concrete, which indicates the safety of the tunnel engineering.

Key words: secondary lining; Surrounding rock pressure; Deformation; Highway tunnel

目 录

第一章 绪论....................................................................................................................................................1

• 1. 隧道的研究背景及其意义....................................................................................................................1
  2. 新奥法及施工方法介绍........................................................................................................................1
  3. 隧道的研究现状......................................................................................................................................3
  4. 隧道围岩压力及变形的分析方法.......................................................................................................4

第二章 隧道二次衬砌围岩压力及工况概述.........................................................................................5

2.1 隧道二次衬砌围岩压力.........................................................................................................................5

2.1.1初期支护................................................................................................................................5

2.1.2隧道的开挖方法....................................................................................................................5

以上是毕业论文大纲或资料介绍，该课题完整毕业论文、开题报告、任务书、程序设计、图纸设计等资料请添加微信获取，微信号：bysjorg。

相关图片展示：