Rebound Calculation for Deep Excavation in Soft Soil Based on Rebound-Recompression Method

Zhuofeng Li, Yiwei Zhu, Chenggong Xu (), Kaiwen Yang, Xiaobing Xu and Huajian Fang
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Zhuofeng Li: School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
Yiwei Zhu: School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
Chenggong Xu: Zhejiang Provincial Erjian Construction Group Ltd., Ningbo 315000, China
Kaiwen Yang: MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China
Xiaobing Xu: School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
Huajian Fang: Dongtong Geotechnical Technology Co., Ltd., Hangzhou 310020, China

Sustainability, 2023, vol. 15, issue 13, 1-16

Abstract: The excavation-induced stress relief and inward movement of the retaining wall will result in soil rebound deformation at the bottom of the excavation, adversely affecting nearby existing tunnels and foundation piles. Various existing methods for calculating the excavation rebound rely on rebound parameters and void ratio obtained from laboratory tests, without considering the effects of sampling, specimen preparation and laboratory procedures on the rebound parameters. As a result, a novel method is proposed in this article for calculating excavation rebound based on rebound-recompression method (RRM). This method first modifies initial void ratio ( e 0 ) and laboratory recompression index ( C LR ) used in traditional methods (TM) for calculation, based on field rebound and recompression curve proposed by the RRM, to in situ void ratio ( e v0 ) and field recompression index ( C FR ). Then, the final rebound at the bottom of the excavation is calculated using a layered summation method. In addition, through two engineering examples, the proposed method is compared with existing calculation methods and measurements, demonstrating that this method is easy of calculate, yields reliable results, and can accurately predict the final soil rebound at the bottom of the excavation.

Keywords: deep excavation; rebound deformation; in situ void ratio; in situ rebound parameters (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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