沉管隧道地基回弹与再压缩计算分析

Analysis of rebound and re-compression in foundation of immersed tube tunnel

为分析沉管隧道在施工过程中遇到的基础回弹和再压缩问题,以港珠澳沉管隧道为工程背景,基于基础沉降理论并结合MIDAS软件对沉管隧道的基础沉降进行分析。研究表明:基槽开挖后基底的回弹变形分布曲线呈拱形,回填及回淤后基底再压缩变形量分布曲线呈抛物线形,回弹量与再压缩变形量均随土层深度的增大而减少。

In order to analyze the problem of the foundation rebound and compressibility encountered in the construction of the immersed tunnel,taking the immersed tunnel of Hong Kong-Zhuhai-Macao as the engineering background,based on the foundation settlement theory and combined with the MIDAS software,the foundation settlement of the immersed tunnel is analyzed. The results show that: the rebound deformation distribution curve of basement after excavation is arched,and the distribution curve of the deformation of basement compressibility after backfilling and siltation is parabolic,the rebound amount and the compressibility are decreased with the increase of soil depth.