Numerical analysis on zone-divided deep excavation in soft clays using a new small strain elasto–plastic constitutive model  

作　　者：Afnan Younis Tanoli Bin Yan Yong-lin Xiong Guan-lin Ye Usama Khalid Zhong-hua Xu 

机构地区：[1]Department of Civil Engineering,State Key Laboratory of Ocean Engineering and Shanghai,Key Laboratory for Digital Maintenance of Buildings and Infrastructure,Shanghai Jiao Tong University,Shanghai 200240,China [2]Institute of Geotechnical Engineering,Ningbo University,Ningbo 315211,China [3]Department of Civil Engineering,Khwaja Fareed University of Engineering and Information Technology,Rahim Yar Khan 64200,Pakistan [4]East China Architectural Design&Research Institute,Shanghai 200002,China

出　　处：《Underground Space》2022年第1期19-36,共18页地下空间（英文）

基　　金：support of the National Nature Science Foundation of China(Grant Nos.42072317,41727802)is gratefully acknowledged.

摘　　要：Accurate prediction of displacements associated with deep excavations is essential to ensure safety and stability of the excavation and to prevent any damage and distress to the adjoining infrastructures.This paper presents a numerical approach for prediction of ground displacements related to a zone-divided deep excavation construction executed in Shanghai soft clays based on a new elasto–plastic con-stitutive model(small-strain Shanghai model)that incorporates small strain stiffness.This model can describe the mechanical properties and structural and over-consolidated characteristics of natural clays.The model is implemented into a finite element analysis software.Numerical analysis on the deep excavation in Shanghai using zone-divided method is conducted.A comparison between monitored and simulated results of horizontal displacements along the diaphragm wall,the settlements in the surroundings,and the effects on the adjoin-ing metro tunnel due to excavation construction is carried out.Special attention is paid to the stiffness degradation of representative elements in the ground.The simulated displacements show a good agreement with the monitored data.Overall,this study provides an integrated solution for predicting displacements related to deep excavation in soft clays.

关 键 词：Deep excavation Soft clays Small strain Elasto-plastic model Ground displacements Metro tunnels 

分 类 号：TU433[建筑科学—岩土工程]