常泰长江大桥施工阶段大型沉井基础沉降变形分析

doi:10.16285/j.rsm.2020.1606

岩土力学 ›› 2021, Vol. 42 ›› Issue (6): 1705-1712.doi: 10.16285/j.rsm.2020.1606

常泰长江大桥施工阶段大型沉井基础沉降变形分析

郭明伟¹，马欢^{1, 2}，杨忠明³，王斌⁴，董学超^{1, 5}，王水林¹

1. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，湖北武汉 430071；2. 安徽理工大学土木建筑学院，安徽淮南 232001；3. 江苏省交通工程建设局，江苏南京 210004；4. 中南勘察基础工程有限公司，湖北武汉 430081；5. 中国科学院大学，北京 100049

收稿日期:2020-10-29 修回日期:2021-03-04 出版日期:2021-06-11 发布日期:2021-06-16
作者简介:郭明伟，男，1981年生，博士，副研究员，硕士生导师，主要从事岩土体稳定性分析方面的研究。
基金资助:
国家自然科学基金（No.51674239）；2019年度交通运输行业重点科技项目（No.2019-MS1-011）。

Settlement analysis of large open caisson foundation at construction stage of Changtai Yangtze River Bridge

GUO Ming-wei¹, MA Huan^{1, 2}, YANG Zhong-ming³, WANG Bin⁴, DONG Xue-chao^{1, 5}, WANG Shui-lin¹

1. State Key Laboratory of Geotechnical Mechanics and Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan, Anhui 232001, China; 3. Jiangsu Provincial Transportation Engineering Construction Bureau, Nanjing, Jiangsu 210004, China; 4. Central South Exploration & Foundation Engineering Co., Ltd., Wuhan, Hubei 430081, China; 5. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2020-10-29 Revised:2021-03-04 Online:2021-06-11 Published:2021-06-16
Supported by:
This work was supported by the National Natural Science Foundation of China(51674239) and the Scientific and Technological Key Projects in Transportation Industry 2019(2019-MS1-011).

摘要/Abstract

摘要： 随着我国大跨度桥梁工程建设中沉井基础的规模越来越大，大型沉井基础的整体沉降对高速铁路桥梁线型控制至关重要。以常泰长江大桥公铁两用大跨度斜拉桥主墩沉井基础为工程背景，详细分析了常泰长江大桥桥梁建设阶段沉井基础的整体沉降，并根据实际的沉井基础尺寸和地层分布，设计了对应的离心机模型试验，综合评估了该沉井基础在桥梁施工阶段的整体沉降变化特征。结果表明：在上部结构施工阶段，沉井整体变形可分为缓慢增长、急剧变形、趋于平稳3个阶段；当土体压缩模量依据实际受力状态取值时计算得到的整体沉降量与离心模型试验结果比较吻合；工程荷载施加完毕时，该沉井基础整体沉降量约为225 mm。该研究成果为常泰长江大桥主墩沉井基础设计提供了重要参考，并对类似沉井基础工程具有重要的借鉴意义。

关键词: 分层总和法, 压缩模量, 离心机模型试验, 沉降量

Abstract: With the increasing size of open caisson foundation in large bridge project in China, the overall settlement of large open caisson foundation is vital to the shape control of high-speed railway bridge. In this paper, by taking the open caisson foundation of long-span and rail-cum-road Changtai Yangtze River Bridge as the engineering background, the overall settlement of the sinking well foundation during the Changtai Yangtze River Bridge construction stage is comprehensively analyzed. In addition, based on the distribution of the stratum and the size of open caisson foundation, the corresponding centrifuge model tests are conducted. According the results of tests, it can be seen that the overall settlement of open caisson foundation can be divided into three stages: slow growth, sharp deformation and leveling off. In addition, the overall settlement calculated by the layered sum method with actual compression modulus of the soil is in good agreement with that of the centrifugal model test and the overall settlement of the open caisson foundation is about 220 mm when the construction stage is finished. This study provides an important reference for the design of open caisson foundation of Changtai Yangtze River Bridge and has referential value to similar open caisson foundation engineering.

Key words: layerwise summation method, compression modulus, centrifuge model test, settlement

中图分类号: TU445

郭明伟, 马欢, 杨忠明, 王斌, 董学超, 王水林, . 常泰长江大桥施工阶段大型沉井基础沉降变形分析[J]. 岩土力学, 2021, 42(6): 1705-1712.

GUO Ming-wei, MA Huan, YANG Zhong-ming, WANG Bin, DONG Xue-chao, WANG Shui-lin, . Settlement analysis of large open caisson foundation at construction stage of Changtai Yangtze River Bridge[J]. Rock and Soil Mechanics, 2021, 42(6): 1705-1712.

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常泰长江大桥施工阶段大型沉井基础沉降变形分析

Settlement analysis of large open caisson foundation at construction stage of Changtai Yangtze River Bridge

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