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隧道平面分岔段力学行为研究

更新时间 2009-9-17 13:22:29 点击数:

隧道平面分岔段力学行为研究
Study on Tunnel Mechanical Behavior in Plane Bifurcate Section
【中文摘要】 交通隧道常需修建各种联络通道和分支隧道,从而形成了各种类型的分岔隧道,平面分岔隧道是一种结构特殊的隧道形式。但是现在对分岔隧道的研究和应用还处于摸索阶段,缺乏系统和全面的研究,导致其设计理论和施工方法还尚不成熟。本文以渝遂高速公路梨树湾隧道为工程背景,应用MIDAS-GTS有限元软件对分岔隧道的在不同围岩级别、不同分岔角度以及不同主隧道断面尺寸条件下的力学行为深入细致的研究,得到以下主要结果:①平面分岔隧道对分岔段不同影响因素条件下隧道应力影响范围。隧道影响因素包括围岩级别(Ⅲ、Ⅳ、Ⅴ)、分岔角度(45°、60°、90°)以及主隧道断面尺寸(二车道、三车道)。针对以上每种因素只能进行单独分析,如果同时变化多种影响因素,会使每种因素的影响变得模糊不清。因此在分析每种因素变化对主隧道应力集中范围的影响,保持其余参数不变。一方面是三车道隧道围岩级别、分岔角度不同沿分岔段纵向影响范围;一方面分岔角度是60°,不同隧道断面尺寸、围岩级别隧道分岔段应力集中范围;另一方面Ⅳ级围岩,不同隧道断面尺寸、分岔角度隧道分岔段应力集中范围。②分别对横通道开挖前后主洞应力及变形进行研究,包括对主洞围岩和支护结构.应力场、围岩应力和位移变化曲线的研究得出分岔隧道开挖后主隧道分岔段围岩的应力、位移变化规律。③从平面分岔隧道分岔段力学行为的角度提出切实可行的加强支护范围。对梨树湾隧道分岔段进行评价,提出了相应的改进和优化建议。表明研究成果可为分岔隧道设计和施工服务

【英文摘要】 Traffic tunnel often need to build a variety of contact channels and branch tunnels, thus forming various types of bifurcate tunnel, plane bifurcate tunnel is a special tunnel form. However, the design theory and construction methods of plane bifurcate tunnel is not yet perfect until now because the researches and applications of the bifurcate tunnel are still in the exploratory stage, lacks a systematic and completely study.In this paper, the MIDAS-GTS finite element software was adopted to deepth study the mechanical behavior of the Lishuwan tunnel with different surroundingrocks grade, bifurcate angle and section size, and the major conclusions were drawn as follows:①according to studies, it can obtained the stress-affected area of plane bifurcate tunnel under different influencing factors in bifurcate part. The influencing factors of tunnel contain surroundingrocks grade (Ⅲ,Ⅳ,Ⅴ), bifurcate angle (45°, 60°, 90°) and main tunnel section size (two-lane, three-lane) . This paper only c.arried out separate analysis of each factor because the impact will become obscured if simultaneous change all factors. Therefore, the other influencing factor should keep invariant when study the stress concentration range of main tunnel which is affected by one factor. In this paper, several tunnel conditions were studied, On the one hand, longitudinal influencing range along the bifurcate section of three-lane tunnel with different surrounding rocks grade and bifurcate angle. On the other hand, the stress concentration range in bifurcate part of the tunnel with 60°bifurcate angle, different surrounding rocks grade and section size. Finally, the stress concentration range in bifurcate part of the tunnel with surrounding rocks gradeⅣ, different bifurcate angle and section size.②The stress and deformation variation raw in bifurcate section of main tunnel with bifurcate tunnel excavated are obtained according to separately study on the stress and deformation of main tunnel with bifurcate tunnel excavated and not excavated, including the stress field, the stress and displacement change curve of surrounding rocks and supporting structure in main tunnel.③The practical reinforced supporting range was proposed according to the mechanical behavior in bifurcate section of plane bifurcate tunnel. The corresponding suggestions of improvment and optimization are put forward according to depth study on the bifurcate part of Lishuwan tunnel. It shows that the research results can provide some useful references for the design and construction of bifurcate tunnel. 

【中文关键词】 分岔隧道; 力学行为; 数值模拟; 应力影响因素
【英文关键词】 Bifurcate tunnel; Mechanical behavior; Numerical simulation; Stress influencing factors
毕业论文目录】
摘要 3-4
ABSTRACT 4-5
第一章 绪论 8-12
    1.1 问题的提出及研究意义 8-11
        1.1.1 问题的提出 8-9
        1.1.2 本文研究的意义和目的 9
        1.1.3 平面分岔隧道工程国内外研究现状 9-11
    1.2 本文的研究内容及方法 11-12
        1.2.1 研究的主要内容 11
        1.2.2 研究方法 11-12
第二章 基本理论及建模考虑 12-22
    2.1 基本理论 12-15
        2.1.1 弹塑性基本理论 12-13
        2.1.2 屈服准则 13-15
    2.2 建模的考虑 15-22
        2.2.1 围岩的力学模型 15-17
        2.2.2 单元的模拟 17
        2.2.3 地应力的模拟 17-18
        2.2.4 边界条件及荷载的确定 18
        2.2.5 有限元分析过程 18-20
        2.2.6 MIDAS/GTS 有限元软件简介 20-22
第三章 研究方案设计 22-28
    3.1 计算方案设计 22-23
    3.2 模型断面大小选取 23-25
    3.3 模型参数的选取 25-26
    3.4 边界条件及荷载的确定 26
    3.5 隧道施工工序 26-28
第四章 平面分岔隧道对主洞应力影响因素分析 28-63
    4.1 主洞应力影响因素的分析 28-40
        4.1.1 沿隧道纵向影响范围分析 28-34
        4.1.2 隧道断面尺寸不同应力变化范围与围岩级别关系 34-37
        4.1.3 隧道断面尺寸不同应力变化范围与分岔角度关系 37-40
    4.2 分岔隧道开挖前后沿主隧道应力及变形分析 40-60
        4.2.1 主隧道应力场结果分析 40-45
        4.2.2 初期支护应力场分析 45-53
        4.2.3 围岩应力变化曲线分析 53-57
        4.2.4 围岩位移变化曲线分析 57-60
    4.3 本章小节 60-63
第五章 分岔段施工支护方案 63-67
    5.1 中梁山隧道分岔段支护方案评价及优化 63-66
        5.1.1 工程概况简介 63
        5.1.2 分岔段支护设计评价 63-65
        5.1.3 施工支护方案优化 65-66
    5.2 本章小节 66-67
第六章 结论与展望 67-69
    6.1 研究成果及结论 67
    6.2 后续工作及展望 67-69
致谢 69-70
参考文献 70-73
在学期间发表的论著和取得的科研成果 73

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