深厚淤泥夹层索塔承台围堰方案比选与优化  

Scheme Comparison and Optimization of the Cofferdam for the Pile Cap of Cable Tower in Deep Silt Interlayer

作　　者：谢德宽 江晓阳 赵文龙 万春风[2] 缪长青[2] XIE Dekuan;JIANG Xiaoyang;ZHAO Wenlong;WAN Chunfeng;MIAO Changqing(CCCC Second Harbor Engineering Co.,Ltd.,Wuhan,Hubei430040,China;School of Civil Engineering,Southeast University,Nanjing,Jiangsu211189,China)

机构地区：[1]中交第二航务工程局有限公司,湖北武汉430040 [2]东南大学土木工程学院,江苏南京211189

出　　处：《施工技术(中英文)》2025年第6期121-127,共7页Construction Technology

基　　金：国家自然科学基金(52178119);绍兴市交通运输科技项目(202412)。

摘　　要：以绍兴曹娥江大桥围堰工程为背景,详细探讨了在淤泥质粉质黏土层条件下,大跨桥梁的承台围堰施工方案及其优化。首先,从安全性、施工可控性、经济性及工期等方面进行了围堰设计方案比选,采用高压旋喷桩进行加固处理,封底混凝土与加固土共同抵抗内外水头差;其次,采用有限元分析软件MIDAS研究钢板桩围堰及内支撑结构在施工过程中的受力和变形情况,对各施工工况进行模拟分析,优化了支撑安装工序及承台封底工艺;最后,通过公式验算嵌固稳定性和基坑抗隆起稳定性。Taking the cofferdam project of Shaoxing Cao’e River Bridge as the background,the construction scheme and optimization of the cap cofferdam of the long⁃span bridge under the conditions of silty clay layer was discussed in detail.Firstly,the cofferdam design options were compared and selected from the aspects of safety,construction controllability,economy and construction period.High⁃pressure rotating piles were used for reinforcement.The bottom sealing concrete and reinforced soil jointly resisted the difference in internal and external water head.Secondly,finite element analysis software MIDAS was used to study the stress and deformation of the steel sheet pile cofferdam and internal support structure during the construction process,each construction condition was analyzed,and the support installation process and the process of the pile cap bottom sealing were optimized.Finally,the embedding stability and foundation excavation anti⁃uplift stability were calculated through formulas.

关 键 词：桥梁 钢板桩 围堰 淤泥质土层 高压旋喷桩 数值模拟 稳定性 

分 类 号：U445[建筑科学—桥梁与隧道工程]