doi:10.16186/j.cnki.1673-9787.2019090006

Received:2019/09/02

Revised:2020/11/21

Published:2021/01/15

Numerical analysis of stress of pile-anchor support structure indeep foundation pit construction

HE Fei1, MU Rui2, LIU Yihong3

1.Guizhou Zhangj~ian Architectural Research and Design Institute Co. ,Ltd. ,Guvyang  550006 ,Guizhou,China;2.Department of Military Installations,Army Logistics University of PLA ,Chongqing  401311 ,China;3.East China Survey and Design Institute Co. ,Ltd. ,China Electric Power Construction Group ,Hangzhou  310014 ,Zhejiang,China

Abstract:In order to study the law of stress change in the construction process of the layered deep foundation pit and its pile anchor supporting structure,based on actual engineering case,the numerical model was established by Midas GTS NX analysis program to analyze it,which included the displacement and internal force of the supporting structure in the construction process of the upper and lower piles of the deep foundation pit. The results showed that:(1) With the increase of excavation depth of foundation pit,the bending moment,shear force,and axial force of the pile increased firstly and then decreased,and there was a reverse bending point in the upper pile；(2)The horizontal displacement and settlement displacement of pile top increased with the increase of excavation depth of the foundation pit,and surface settlement displacement was distributed in a " V" shape,which was most affected within 4〜5 m form the edge of the foundation pit ； (3) With the increase of excavation depth of foundation pit,the internal force of cable would change suddenly,and the effect was larger. The research results could provide some references for the optimization design and construction scheme of similar engineering pile anchor support structure.

Key words:deep foundation pit;pile anchor supporting structure;numerical simulation;step excavation;internal force analysis

 深基坑施工过程中桩锚支护结构受力数值分析_何飞.pdf