| 大跨度公铁合建斜拉桥主塔沉井基础沉降变形分析 |
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| 引用本文： | 谭国宏,肖海珠,杜勋,胡文军.大跨度公铁合建斜拉桥主塔沉井基础沉降变形分析[J].岩土力学,2019,40(3):1113-1120. |
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| 作者姓名： | 谭国宏 肖海珠 杜勋 胡文军 |
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| 作者单位： | 中铁大桥勘测设计院有限公司，湖北 武汉 430056 |
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| 摘 要： |
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| 关 键 词： | 大跨度斜拉桥 沉井基础 基础沉降 小应变土体硬化模型(HSS) 分层总和法 |
| 收稿时间： | 2018-12-17 |
Settlement analysis of caisson foundation under main tower of a long span cable-stayed bridge for highway and railway |
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| TAN Guo-hong,XIAO Hai-zhu,DU Xun,HU Wen-jun.Settlement analysis of caisson foundation under main tower of a long span cable-stayed bridge for highway and railway[J].Rock and Soil Mechanics,2019,40(3):1113-1120. |
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| Authors: | TAN Guo-hong XIAO Hai-zhu DU Xun HU Wen-jun |
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| Institution: | China Railway Major Bridge Reconnaissance & Design Institute Co., Ltd., Wuhan, Hubei 430056, China |
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| Abstract: | It is vital to foreknow the overall settlement of bridge foundation for high speed railway in order to keep control of the bridge line. However, it is questionable to calculate the overall settlement of the large caisson foundation at a great depth by using layer-wise summation method recommended in the specification. In this paper, a deep and large caisson foundation under main tower of a long span cable-stayed bridge is taken into account. The overall settlement of caisson foundation is calculated by finite element method (FEM) with Mohr-Coulomb model (M-C), hardening-soil model (HS) and small-strain hardening soil model (HSS), respectively. Compared with the field monitoring data, the numerical results show that the overall settlements with HSS model are in good agreement with the monitoring data. Furthermore, the settlements in the following construction stages are rationally predicted by FEM. For layer-wise summation method recommended in the specification, the empirical settlement coefficient is corrected based on the monitoring data, and it is found that when the empirical settlement coefficient is equal to 0.13, the settlements by summation method are consistent with the monitoring data in this case. |
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| Keywords: | long span cable-stayed bridge caisson foundation foundation settlement small-strain hardening soil model (HSS) layer-wise summation method |
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