| 基坑开挖对下方越江隧道变形影响的评价 |
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| 引用本文： | 周宁,袁勇,王莉,吴小建.基坑开挖对下方越江隧道变形影响的评价[J].地震学刊,2012(5):565-572. |
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| 作者姓名： | 周宁 袁勇 王莉 吴小建 |
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| 作者单位： | [1]交通运输部公路科学研究院,北京100088 [2]北京交科公路勘察设计研究院,北京100191 [3]同济大学地下建筑与工程系,上海200092 [4]上海黄浦江越江设施投资建设发展有限公司,上海200031 [5]上海建工集团,上海200083 |
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| 基金项目： | 上海市科委社会发展领域重点科技项目（08201201200）; 上海市建设和交通委员会重点科技项目（重科2008-009）资助 |
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| 摘 要： | 采用数值模拟方法计算隧道附加纵向变形值,应用三次样条插值对其进行拟合,并通过曲线拟合方程计算基坑影响范围内隧道纵向变形曲率的分布,以判别隧道纵向差异变形的敏感位置,从而评价隧道在不同抽条开挖方式与不同开挖工况下的变形状态,为基坑支护的设计提供依据。研究表明：基坑中心位置隧道的纵向变形最大,隧道纵向变形曲率变化最大的区域为隧道纵向基坑围护结构的位置。说明对于由基坑开挖引起的近接隧道保护问题而言,在严格控制坑底隆起量的同时,更应关注基坑维护刚度对隧道结构变形的影响。通过施工工法、隧道纵向变形及隧道纵向曲率变化三方面的综合评价,得出顺向抽条开挖方式对隧道保护更加有利的认识。
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| 关 键 词： | 纵向差异变形 纵向变形 曲率变化 数值模拟 方案比选 |
Evaluation of Influence of Foundation Pit Excavation on Underlying Cross-river Tunnel |
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| ZHOU Ning,YUAN Yong,WANG Li,WU Xiao-jian.Evaluation of Influence of Foundation Pit Excavation on Underlying Cross-river Tunnel[J].Journal of Seismology,2012(5):565-572. |
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| Authors: | ZHOU Ning YUAN Yong WANG Li WU Xiao-jian |
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| Institution: | 5 (1. Research Institute of Highway, Ministry of Transport, Beijing 100088, China 2. RIOH Transport Consultants LTD., Beijing 100191, China 3. Department of Geotechnical Engineering. , Tongji University, Shanghai 200092, China 4. Shanghai Huangpu River Cross-river Engineering Investment Construction Co. Ltd, Shanghai 200031, China; 5. Shanghai Construction Group, Shanghai 200083, China) |
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| Abstract: | The additional longitudinal deformation of tunnel was calculated by using the numerical simulation method, and its fitting equation was established by cubic spline interpolation. According to the fitting equation, the distribution of longitudinal deformation curvature of tunnel in the influence scope of founda- tion pit excavation was calculated, and sensitive location of longitudinal differential deformation of the tun- nel was discriminated, based on which the tunnel deformation state under different sprout excavation ways and conditions could be evaluated and evidence can be provided for the design of foundation pit support. The results show that the maximum of longitudinal deformation is located in the center of the excavation, and maximum region of longitudinal deformation curvature is situated in the position of perimeter structure of foundation pit, both of which prove that in protecting the tunnels near excavation, not only the bottom uplifts should be strictly controlled, but also the effect of the rigidity maintenance on the tunnel deforma- tion should be concerned more. At last, according to the comprehensive evaluation of construction meth- ods, tunnel longitudinal deformation, and the variety of longitudinal curvature, parallel sprout excavation is more beneficial to the tunnel protection. |
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| Keywords: | longitudinal different deformation longitudinal deformation curvature change numericalsimulation scheme comparision |
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