大直径污水排海管顶管施工对反力墙影响分析  

Analysis of Influence of Jacking Construction of Large Diameter Sewage Pipe on Reaction Wall

作　　者：薛宏伟 Xue Hongwei(Xiamen Brancht CCCC Third Harbor Engineering Co.,Ltd.,Xiamen 361003,China)

机构地区：[1]中交第三航务工程局有限公司厦门分公司,福建厦门361003

出　　处：《市政技术》2022年第3期162-168,共7页Journal of Municipal Technology

基　　金：厦门市建设局科技项目(XJK-2019-1-4);厦门市建设局科技项目(XJK-2020-1-21)。

摘　　要：以厦门市前埔污水处理厂排海管工程为背景,借助有限元软件构建了顶管工作井基坑和管沟基坑的三维数值模型,并动态模拟了顶管施工;研究了反力墙变形和墙后土压力变化规律,对其敏感性参数进行了分析。研究结果表明,反力墙墙后土压力分布符合拟正态分布规律;墙后土压力增量极值随着千斤顶作用荷载中心的上移而降低,随着顶管直径和荷载的增大而显著增加;取消加强背板和内衬,墙后土压力随之显著增大,但分布形态与范围基本不变;实测数据表明,随着千斤顶顶力的施加,墙体发生了新增水平位移,且位移值最大。Based on the sewage outfall project of Qianpu sewage treatment plant in Xiamen,the three-dimensional numerical models of pipe jacking working well foundation pit and pipe trench foundation pit are constructed by finite element software.The pipe jacking construction is dynamically simulated;The deformation of reaction wall and the variation law of earth pressure behind the wall are studied,and the sensitive parameters are analyzed.The results show that the earth pressure distribution behind the reaction wall conforms to the quasi normal distribution law;The maximum value of earth pressure increment behind the wall decreases with the upward movement of the load center of the jack,and increases significantly with the increase of pipe jacking diameter and load;The earth pressure behind the wall increases significantly when the back plate and lining are cancelled,but the distribution shape and range are basically unchanged;The measured data show that the wall has a new horizontal displacement with the application of Jack jacking force and the displacement value is the largest.

关 键 词：污水排海管 顶管施工 反力墙 有限元分析 

分 类 号：TU992.05[建筑科学—市政工程]