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| Rebound and recompression deformation characteristics of soft soil foundation in levee back-cutting |
| LIU Jie1, LIU Yong2, LU Zheng1*, LI Zhiyong3, YAO Hailin1 |
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering Safety, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. No. Seven Engineering Co., Ltd. of CCCC First Highway Engineering Co.,
Ltd., Zhengzhou, Henan 451450, China; 3. Hunan Communications Research Institute Co., Ltd., Changsha, Hunan 410118, China) |
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Abstract The results indicate that the rebound deformation rate of the soil and the deformation during reloading are primarily associated with the unloading ratio and the reloading ratio, respectively. The rebound deformation of soft soil surrounding the pipeline, induced by the reverse trenching construction of existing dike conveyance pipelines, exhibits a “reverse pot-bottom shape” characterized by larger deformation in the middle and smaller deformation toward the sides. A higher foundation compression modulus results in reduced pipeline deformation and vertical displacement of the surrounding soil. As pipeline stiffness increases, the ability of the pipeline and surrounding soil to deform in coordination deteriorates, leading to a corresponding increase in the maximum bending moment experienced by the pipeline. For pipelines with joints, the vertical displacement demonstrates a pronounced slope mutation at the joint locations, and the pattern of vertical displacement transitions from the “reverse bell shape” of jointless pipelines to a “funnel shape”. The maximum displacement of pipelines with joints surpasses that of jointless pipelines, and the vertical displacement of pipelines increases linearly with the number of joints, exhibiting a slope discontinuity at the maximum displacement. Increased saturation of the foundation soft soil causes the maximum rebound and recompression deformation of the foundation soft soil to exhibit a linear or exponential increasing trend. The proposed empirical relationship between the rebound modulus and the unloading ratio can effectively and accurately predict the rebound deformation of soft soil foundations in reverse trenching, providing theoretical guidance for the design, construction, and maintenance of buried pipelines in dike engineering.
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2026, Vol. 45 
