Numerical and theoretical analysis on soil arching effect of prefabricated piles as deep foundation pit supports  

作　　者：Qianwei Xu Jinli Xie Linhai Lu Yongji Wang Chaojun Wu Qiang Meng 

机构地区：[1]Key Laboratory of Road and Traffic Engineering,Ministry of Education,Tongji University,Shanghai 201804,China [2]Jinan Rail Transit Group Co.,Ltd,Jinan 250101,China [3]Guangxi Nanning Airport Comprehensive Transportation Hub Construction Co.,Ltd.,Nanning 530048,China

出　　处：《Underground Space》2024年第3期314-330,共17页地下空间（英文）

基　　金：supported by Key R&D Program of Shandong Province,China(Grant No.2021CXGC011203).

摘　　要：This study presents a detailed investigation into the soil arching effects within deep foundation pits(DFPs),focusing on their mechanical behavior and implications for structural design.Through rigorous 3D finite element modeling and parameter sensitivity analyses,the research explores the formation,geometric characteristics,and spatial distribution of soil arching phenomena.The investigation encompasses the influence of key parameters such as elastic modulus,cohesion,and internal friction angle on the soil arching effect.The findings reveal that soil arching within DFPs exhibits distinct spatial characteristics,with the prominent arch axis shifting as excavation depth progresses.Optimal soil arching is observed when the pile spacing approximates three times the pile diameter,enhancing soil retention and minimizing deformation risks.Sensitivity analyses highlight the significant impact of soil parameters on soil arching behavior,underscoring the critical role of cohesive forces and internal friction angles in shaping arching characteristics.By elucidating the interplay between soil parameters and soil arching effects,the research provides insights for optimizing pile spacing and structural stability.

关 键 词：Soil arching effect Numerical analysis Foundation pit support Pile spacing 

分 类 号：U45[建筑科学—桥梁与隧道工程]