Finite Element Analysis of Effects of Improvement of Soil Between Double-Row Piles  

作　　者：NIE Dongqing ZHAI Zhiyang ZHANG Wei LI Zhi 聂东清;翟之阳;张威;李志(Shanghai Municipal Engineering Design General Institute(Group)Co.,Ltd.,Shanghai,200092,China;Changjiang River Scientific Research Institute,Wuhan,430010,China)

机构地区：[1]Shanghai Municipal Engineering Design General Institute(Group)Co.,Ltd.,Shanghai,200092,China [2]Changjiang River Scientific Research Institute,Wuhan,430010,China

出　　处：《Journal of Shanghai Jiaotong university(Science)》2024年第5期919-929,共11页上海交通大学学报（英文版）

基　　金：the Key Research Program of Shanghai Construction Group(No.17JCSF-37)。

摘　　要：Double-row pile(DRP)retaining systems have been widely used in deep excavations in China.Soil between the front and back-row piles(FBP soil)is often improved to decrease the displacement of DRPs in soft soil areas,but the improvement efficiency has rarely been researched.A large and deep excavation supported by a DRP retaining system is introduced,and the effect of FBP soil improvement is discussed by comparing the finite element analysis and the monitoring results.Then,a parametric study of DRP using the finite element method considering the small strain of soil is conducted to investigate the effect of FBP soil improvement.It was shown that the pile deflection and bending moment decrease when the FBP soil is improved.Moreover,the most efficient way to minimize the pile deflection and bending moment is to improve the FBP soil around the excavation level.The FBP soil improvement 2-4 m below the pile head is not very useful for reducing the pile deflection and can be eliminated when the pile displacement limit is not very strict.

关 键 词：large excavation double-row pile(DRP) soil improvement DEFLECTION bending moment finite element analysis 

分 类 号：TU473[建筑科学—结构工程]