Abstract: In deep excavation projects in the soft soil area, the deep foundation subsoil often demonstrates the rebound deformation. The bottom heaving deformation of the soil has a large effect on the stability of the excavated foundation soils. Based on some current analysis methods for the rebound deformation of the foundation soils, this paper combines two practical engineering case histories to estimate the rebound values at the excavated bottom. The estimated values are compared with the measured data in terms of the excavation footprint dimensions, depth, and soil properties of the deep excavations. Finally, it is concluded that the self-weight stress offset method is closer to the measured data, which can accurately estimate the rebound deformation value at the bottom of the excavated soils in soft soil area. The results provide some reference value for the future deep excavation supporting design and foundation deformation prediction.

Key words: Deep Excavations, Rebound Deformation, Residual Stress, Self-weight Stress Offset Method, Numerical Analysis