[1] Ouyang Xiaoyong, , Zhao Wenguang, et al. Calculation mode of side friction for large open caisson [J]. Journal of Southeast University (English Edition), 2015, 31 (1): 130-136. [doi:10.3969/j.issn.1003-7985.2015.01.022]

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Calculation mode of side friction for large open caisson()

大型沉井侧壁摩阻力计算模型

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

31

Issue:

2015 1

Page:

130-136

Research Field:

Civil Engineering

Publishing date:

2015-03-30

Info

Title:

Calculation mode of side friction for large open caisson

大型沉井侧壁摩阻力计算模型

Author(s):

Ouyang Xiaoyong^{1, 2, 3}, Zhao Wenguang^{1, 2}, Li Jin³, Li Song³

¹School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
²Hubei Key Laboratory of Control Structure, Huazhong University of Science and Technology, Wuhan 430074, China
³CCCC Second Highway Engineering Co., Ltd, Xi’an 710065, China

欧阳效勇^{1, 2, 3}, 赵文光^{1, 2}, 李进³, 李松³

¹华中科技大学土木工程与力学学院, 武汉 430074; ²华中科技大学控制结构湖北省重点实验室, 武汉 430074; ³中交第二公路工程局有限公司, 西安 710065

Keywords:

large open caisson;  side friction;  distribution diagram;  calculation mode

大型沉井;  侧摩阻力;  分布图式;  计算模型

PACS:

TU74

DOI:

10.3969/j.issn.1003-7985.2015.01.022

Abstract:

To overcome the problems in design methodologies and construction control measures for the large open caisson, systematic research was conducted on the side friction calculation mode of the large open caisson. Based on the field monitoring data of lateral soil pressure on the side wall of the open caisson for the southern anchorage of the Maanshan Yangtze River Highway Bridge, the statistical result of the side friction under different buried depths of the cutting edge of the open caisson was back-analyzed; and the side friction distribution of the large open caisson was underlined. The analysis results indicate that when the buried depth of the cutting edge is smaller than a certain depth H₀, the side friction linearly increases with the increase in the buried depth. However, as the buried depth of the cutting edge is larger than H₀, the side friction shows a distribution with small at both ends and large in the middle. The top of the distribution can be regarded as a linear curve, while the bottom as a hyperbolic curve. As the buried depth of cutting edge increases continuously, the peak value of the side friction linearly increases and the location of the peak value gradually moves down. Based on the aforementioned conclusions, a revised calculation mode of the large open caisson is presented. Then, the calculated results are compared with the field monitoring data, which verifies the feasibility of the proposed revised calculation mode.

为了克服大型沉井设计和施工控制中存在的问题, 对大型沉井侧壁摩阻力的计算模式进行了研究.根据马鞍山长江大桥南锚碇沉井侧壁土压力的现场监测数据, 反推出不同下沉深度条件下沉井侧壁摩阻力的统计结果, 并研究了大型沉井下沉期侧壁摩阻力的分布特征.分析结果显示:当沉井下沉深度小于某一特定深度H₀时, 井壁侧阻力基本上随着入土深度呈线性增长;而当沉井刃脚入土深度大于H₀时, 沉井侧壁摩阻力分布呈现上下小、中间大的分布, 上部可近似为线性段, 下部则近似为双曲线段;而且随着沉井入土深度的不断增加, 沉井侧壁摩阻力峰值基本呈线性增长, 且峰值发生的位置也逐渐下移.最后, 建立了一种大型沉井侧壁摩阻力的修正计算模式.与现场实测数据的对比结果表明, 所提出的修正计算模式是可行的.

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Memo

Memo:

Biographies: Ouyang Xiaoyong(1962—), male, graduate; Zhao Wenguang(corresponding author), male, doctor, professor, zhao_wenguang1037@126.com.
Foundation item: Project supported by China Communications Construction Company Limited(No.2008-ZJKJ-11).
Citation: Ouyang Xiaoyong, Zhao Wenguang, Li Jin, et al. Calculation mode of side friction for large open caisson[J].Journal of Southeast University(English Edition), 2015, 31(1):130-136.[doi:10.3969/j.issn.1003-7985.2015.01.022]

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