| 越江盾构隧道纵向结构分析模型的改进及应用 |
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| 引用本文： | 周宁,袁勇.越江盾构隧道纵向结构分析模型的改进及应用[J].中国矿业大学学报,2010,39(2). |
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| 作者姓名： | 周宁 袁勇 |
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| 作者单位： | 1. 同济大学土木工程学院,上海,200092
2. 同济大学土木工程学院,上海,200092;同济大学岩土及地下工程教育部重点实验室,上海,200092 |
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| 基金项目： | 国家自然科学基金，国家科技支撑计划 |
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| 摘 要： | 在盾构隧道等效刚度连续模型中考虑了环缝影响系数的影响,推导了改进模型的力学计算公式,建立了隧道纵向变形曲率及环缝变形与环缝等效刚度之间的关系.利用该模型对上海某越江隧道进行了工程应用分析.根据盾构隧道临界状态的变形界值,初步建立了越江盾构隧道纵向变形曲率半径与环缝张开量间的关系.计算表明:与地铁盾构隧道相比,越江隧道曲率半径的限值要求可适当放宽.越江隧道纵向变形曲率半径小于1.257km时,环缝张开量大于6mm,环缝密封止水措施失效,隧道会出现严重的渗水漏泥现象.越江隧道螺栓极限应力状态相应的环缝张开量为21.00mm,此时环缝连接破环,不能满足隧道的结构性安全要求.
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| 关 键 词： | 越江隧道 纵向变形 模型修正 环缝张开量 曲率半径 |
An Improved Longitudinal Structure Model of Cross-River Shield Tunnel and Its Application |
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| ZHOU Ning,YUAN Yong.An Improved Longitudinal Structure Model of Cross-River Shield Tunnel and Its Application[J].Journal of China University of Mining & Technology,2010,39(2). |
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| Authors: | ZHOU Ning YUAN Yong |
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| Affiliation: | ZHOU Ning1,YUAN Yong1,2(1. Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China,2. Key Laboratory for Geotechnical , Underground Engineering of Ministry of Education,China) |
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| Abstract: | The equivalent-continuous rigidity model was modified by the introduction of circular seam coefficients for a shield tunnel. The basic assumptions and the formula for the model are given. A relationship between circular-seam deformation and circular-seam equivalent rigidity is developed. Cross-river shield tunnels in Shanghai area were analyzed with the model. Critical deformation values of the shield tunnel were used to build a relationship between longitudinal deformation and circular-seam stretching of t... |
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| Keywords: | cross-river tunnel longitudinal deformation model modification circular seam stretching-amount curvature radius |
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