A quantitative analysis of the spatial effects of retaining structure for slender foundation pits

2018 International Conference on Civil and Hydraulic Engineering

土木建筑工程;水利工程

Wang, Chenghua^1 ; Wang, Xiaoxuan^1

School of Civil Engineering, Tianjin University, Tianjin

300354, China^1

关键词: Displacement ratios;    Earth pressure theories;    Foundation pits;    Laboratory model test;    Non-linear finite-element analysis;    Qualitative analysis;    Retaining structure;    Wall displacements;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/189/2/022036/pdf
DOI  :  10.1088/1755-1315/189/2/022036

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The methods for design of retaining structures of hollow slender foundation pits based on classical earth pressure theories such as Rankine's and Coulomb's theories have inevitably drawn fierce criticization for their incapable of considering spatial effects of the structures. Researches in understanding the spatial effects of retaining structures are still in initial qualitative analysis stages. In this paper, three spatial effect ratios including displacement ratio, earth pressure ratio and bending moment ratio of a retaining structure were defined for the sake of analyzing the spatial effects of retaining structures of hollow slender foundation pits. Nonlinear finite element analyses and laboratory model tests of retaining structures in sands were conducted. The spatial effect ratios and the relationships of additional earth pressures vs. wall displacements were obtained from the results of the finite element analyses and model tests, and they all shown significantly variation with the process of excavation, and show a strong tendency in their distribution at different positions. These results are distinct from that based on classical earth pressure theories in general rules, and of importance in developing new design methods that make use of the spatial effects in practice.