|Table of Contents|

Stress Response of Pile Foundation Deformation of Highway Bridge Caused by Unloading of Pit Excavation(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2020年05期
Page:
214-215
Research Field:
Publishing date:

Info

Title:
Stress Response of Pile Foundation Deformation of Highway Bridge Caused by Unloading of Pit Excavation
Author(s):
YANG Tao1;  TONG Li-yuan1;  LI Dan2
1. School of Transportation, Southeast University, Nanjing 210096, Jiangsu, China; 2. Nanjing Urban Public Project Construction Center, Nanjing 210019, Jiangsu, China
Keywords:
excavation of foundation pit;  horizontal additional stress;  finite difference method;  two-stage analysis method
PACS:
TU473
DOI:
10.19815/j.jace.2019.10007
Abstract:
The two-stage analysis method was used to analyze the stress and deformation law of highway bridge pile foundation under unloading of foundation pit excavation. The first stage of the two-stage method was based on the Mindlin solution. Using the composite Simpson formula to solve the numerical integration, the horizontal additional stress at the pile position in the soil under the simultaneous action of the side wall unloading and the bottom unloading of the foundation pit was obtained. In the second stage, Kerr three parameter foundation model was used to establish the deflection differential equation of highway bridge pile foundation. Combined with the horizontal additional stress, the mathematical analytic matrix expression of the differential equation of pile deflection was obtained by using the finite difference numerical calculation method. The calculation formula was used to calculate the excavation condition of foundation pit near the pile foundation of highway bridge, and the validity of the calculation method was verified by comparing with the numerical simulation results. The influence factors of axial load of pile foundation, distance between foundation pit and pile foundation and three-dimensional dimension of foundation pit were analyzed. The results show that the change of axial load of pile foundation has no obvious effect on the horizontal displacement and bending moment of pile body. With the increase of the distance between the pile foundation and the foundation pit, the horizontal displacement and the maximum bending moment of the pile foundation decrease gradually, and the change of the horizontal displacement and bending moment of the pile foundation becomes more and more gentle in a large range. The influence of excavation depth on horizontal displacement and bending moment of pile foundation is far greater than that of excavation length and width, and the influence of excavation width of foundation pit on pile foundation is the least.

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---NEXT MATCH---收稿日期:2020-09-15
基金项目:国家自然科学基金项目(51778058,51378068); 中央高校基本科研业务费专项资金项目(300102219310)
作者简介:刘永健(1966-),男,江西玉山人,教授,博士研究生导师,工学博士,E-mail:liuyongjian@chd.edu.cn。

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Last Update: 2020-10-15