软弱围岩隧道大变形控制技术研究
发布时间：2018-10-09 16:49
【摘要】：在已规划和设计的隧道中，软弱围岩隧道越来越多，，由于现在对软弱围岩大变形产生的机理和变形控制在设计和施工中均没有形成一个完整系统的理论体系，因此，对软弱围岩大变形理论、开挖工法和支护控制措施进行研究，解决软弱围岩隧道开挖所产生的大变形等灾害就越显的迫在眉睫。 本论文以迎风隧道为工程依托，以相关文献为基础，对软弱围岩大变形概念、大变形发生机理、大变形划分类型、大变形的界定和等级划分进行了总结分析。介绍了迎风隧道地形地质、围岩特性、等级划分、施工中产生的大变形问题及大变形力学分析。采用岩土工程软件FLAC3D针对该隧道特定的工程地质条件进行大变形模拟验证，并针对该隧道大变形的工程特点和现场情况，提出了两种控制技术：①隧道围岩扩挖控制技术；②预应力锚索支护控制技术。 隧道围岩规律性扩挖大变形控制技术研究：通过选取某开挖断面，采取0.60m、0.65m、0.70m和0.75m四种扩挖量对隧道围岩和扩挖支护、初期支护应力，以及扩挖轮廓线、初支内外侧轮廓线上隧道不同部位竖向沉降位移、水平收敛位移模拟和对比，对该方案的可行性及合理扩挖量进行分析。 预应力锚索支护控制技术研究：采用不同等级预应力锚索对隧道加固模拟计算，对隧道围岩、初期支护和锚索轴力、应力，以及初支内外侧轮廓线隧道不同部位的竖向沉降位移、水平收敛位移对比，分析预应力锚索对隧道大变形控制效果。 论文在最后对两个控制方案的大变形控制效果做了总结和对比分析，给出有效的控制方案，即通过隧道围岩规律性扩挖来进行大变形控制。并指出了隧道大变形尚未解决的问题，即理论体系和工程实践中控制技术中存在的难题。
[Abstract]:Among the tunnels that have been planned and designed, there are more and more soft surrounding rock tunnels. Because the mechanism and deformation control of large deformation of soft surrounding rock have not formed a complete and systematic theoretical system in design and construction, In this paper, the theory of large deformation of soft surrounding rock, excavation method and supporting control measures are studied. It is more and more urgent to solve the disasters such as large deformation caused by excavation of soft surrounding rock tunnel. Based on the engineering of windward tunnel and related literature, this paper summarizes and analyzes the concept of large deformation of soft surrounding rock, the mechanism of large deformation, the classification of large deformation, the definition and grade of large deformation. This paper introduces topographic geology, surrounding rock characteristics, classification of surrounding rock, large deformation problem and mechanical analysis of large deformation in construction of windward tunnel. The geotechnical engineering software FLAC3D is used to simulate and verify the large deformation of the tunnel's specific engineering geological conditions. According to the engineering characteristics and site conditions of the tunnel, two kinds of control techniques are put forward. 2 Prestressed anchor cable support control technology. Study on the control technology of large deformation of tunnel surrounding rock: by selecting a certain excavation section, four kinds of expanding excavations, including 0.60mL 0.65mm 0.70m and 0.75m, to the surrounding rock and support of tunnel, the initial support stress, and the contour line of the expanded excavation, are adopted. The vertical settlement displacement and horizontal convergent displacement of different parts of the tunnel on the inner and outer side contour of the primary support are simulated and compared. The feasibility of the scheme and the reasonable amount of expansion are analyzed. Study on the Control Technology of Prestressed Anchor Cable support: using different grades of Prestressed Anchorage cables to simulate the reinforcement of the tunnel, the axial force and stress of the surrounding rock, the initial support and the anchor cable of the tunnel are calculated. The vertical settlement displacement and horizontal convergent displacement of different parts of the tunnel with the inner and outer side profile of the initial support are compared and the control effect of the prestressed anchor cable on the large deformation of the tunnel is analyzed. At the end of the paper, the control effect of the two control schemes is summarized and compared, and the effective control scheme is given, that is, the large deformation control is carried out by the regular expansion and excavation of the surrounding rock of the tunnel. It also points out the unsolved problems of large deformation of tunnel, that is, the problems existing in the theory system and control technology in engineering practice.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U452.12;U455.4
本文编号：2260058
[Abstract]:Among the tunnels that have been planned and designed, there are more and more soft surrounding rock tunnels. Because the mechanism and deformation control of large deformation of soft surrounding rock have not formed a complete and systematic theoretical system in design and construction, In this paper, the theory of large deformation of soft surrounding rock, excavation method and supporting control measures are studied. It is more and more urgent to solve the disasters such as large deformation caused by excavation of soft surrounding rock tunnel. Based on the engineering of windward tunnel and related literature, this paper summarizes and analyzes the concept of large deformation of soft surrounding rock, the mechanism of large deformation, the classification of large deformation, the definition and grade of large deformation. This paper introduces topographic geology, surrounding rock characteristics, classification of surrounding rock, large deformation problem and mechanical analysis of large deformation in construction of windward tunnel. The geotechnical engineering software FLAC3D is used to simulate and verify the large deformation of the tunnel's specific engineering geological conditions. According to the engineering characteristics and site conditions of the tunnel, two kinds of control techniques are put forward. 2 Prestressed anchor cable support control technology. Study on the control technology of large deformation of tunnel surrounding rock: by selecting a certain excavation section, four kinds of expanding excavations, including 0.60mL 0.65mm 0.70m and 0.75m, to the surrounding rock and support of tunnel, the initial support stress, and the contour line of the expanded excavation, are adopted. The vertical settlement displacement and horizontal convergent displacement of different parts of the tunnel on the inner and outer side contour of the primary support are simulated and compared. The feasibility of the scheme and the reasonable amount of expansion are analyzed. Study on the Control Technology of Prestressed Anchor Cable support: using different grades of Prestressed Anchorage cables to simulate the reinforcement of the tunnel, the axial force and stress of the surrounding rock, the initial support and the anchor cable of the tunnel are calculated. The vertical settlement displacement and horizontal convergent displacement of different parts of the tunnel with the inner and outer side profile of the initial support are compared and the control effect of the prestressed anchor cable on the large deformation of the tunnel is analyzed. At the end of the paper, the control effect of the two control schemes is summarized and compared, and the effective control scheme is given, that is, the large deformation control is carried out by the regular expansion and excavation of the surrounding rock of the tunnel. It also points out the unsolved problems of large deformation of tunnel, that is, the problems existing in the theory system and control technology in engineering practice.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U452.12;U455.4
【参考文献】
相关期刊论文 前10条
1 徐林生,李永林,程崇国;公路隧道围岩变形破裂类型与等级的判定[J];重庆交通学院学报;2002年02期
2 罗清明,李亮,杨小礼;软岩隧道的围岩变形计算[J];长沙铁道学院学报;2003年02期
3 赵瑜;李晓红;卢义玉;康勇;;深埋隧道围岩应变软化模型参数的正交设计[J];重庆大学学报;2008年07期
4 李斌;漆泰岳;高波;旷文涛;;新意法(岩土控制变形工法)概述[J];公路隧道;2009年02期
5 符华兴;强挤压围岩隧道施工支护技术的商榷[J];隧道建设;2003年01期
6 翟进营;杨会军;王莉莉;;新意法隧道设计施工概述[J];隧道建设;2008年01期
7 段庆伟,何满潮,张世国;复杂条件下围岩变形特征数值模拟研究[J];煤炭科学技术;2002年06期
8 朱德仁;岩石工程破坏准则[J];煤炭学报;1994年01期
9 刘志春;孙明磊;贾晓云;朱永全;;乌鞘岭隧道F4~F7断层区段压力、应力实测与分析[J];石家庄铁道学院学报;2006年02期
10 孙明磊;刘志春;张德莹;;乌鞘岭隧道F7断层区段左线迂回导坑监控量测[J];石家庄铁道学院学报;2006年02期
本文编号：2260058
本文链接：https://www.wllwen.com/kejilunwen/jiaotonggongchenglunwen/2260058.html
