| 溶槽地段隧道地基梁的结构分析与优化设计 |
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| 引用本文： | 夏桂云,俞茂宏.溶槽地段隧道地基梁的结构分析与优化设计[J].中南大学学报(自然科学版),2011,42(2). |
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| 作者姓名： | 夏桂云 俞茂宏 |
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| 作者单位： | 1. 西安交通大学航天航空学院,陕西西安,710049;长沙理工大学土木与建筑学院,湖南长沙,410004
2. 西安交通大学航天航空学院,陕西西安,710049 |
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| 基金项目： | 中国博士后基金资助项目 |
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| 摘 要： | 介绍隧道遇到溶槽时采用地基梁穿越的结构方案;利用Winkler地基上Timoshenko梁理论分析地基梁的极值内力、位置和变形;比较不同支承长度对地基梁弯矩、剪力分布的影响;提出极值弯矩比相等的支承长度优化目标;分析溶槽地段填充物的基床系数和沉降对地基梁受力的影响.研究结果表明:Winkler地基梁采用Euler梁理论分析时将低估地基的支承作用;2种不同地基介质的交界处是地基梁剪力最不利位置,最大负弯矩发生在支承段且靠近地基介质交界处,最大正弯矩发生在溶槽内;溶槽填充物的沉降显著改变地基梁受力,完全悬空时地基梁最不利正、负弯矩分别改变41.56和37.52倍,最不利正、负剪力分别改变32.67和12.55倍,设计和施工时应重视此问题.
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| 关 键 词： | 溶槽 弹性地基梁 剪切变形 支承长度 |
Structural analysis and optimum design for elastic foundation beam of tunnel in water-eroded groove |
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| XIA Gui-yun,YU Mao-hong.Structural analysis and optimum design for elastic foundation beam of tunnel in water-eroded groove[J].Journal of Central South University:Science and Technology,2011,42(2). |
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| Authors: | XIA Gui-yun YU Mao-hong |
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| Institution: | XIA Gui-yun1,2,YU Mao-hong1 (1.School of Aeronautics and Astronautics,Xi'an Jiaotong University,Xi'an 710049,China,2.School of Civil Engineering and Architecture,Changsha University of Science and Technology,Changsha 410004,China) |
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| Abstract: | Structural scheme of elastic foundation beam for tunnel was introduced to span water-eroded groove,and the theory of Timoshenko beam on Winkler foundation was used to calculate the extreme internal forces,positions and deflections.The influences of different bearing lengths on moments and shear forces for elastic foundation beam were compared.Based on the optimum object of positive moment and negative moment being equal,the optimum bearing length was derived.The influences of foundation modulus of filling m... |
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| Keywords: | water-eroded groove elastic foundation beam shear deflection bearing length |
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