|Table of Contents|

Study on Interaction Between Deep Foundation Pit Excavation and Reconstruction of Surrounding Existing Buildings(PDF)

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

Issue:
2021年06期
Page:
80-89
Research Field:
软土基坑设计与变形控制
Publishing date:

Info

Title:
Study on Interaction Between Deep Foundation Pit Excavation and Reconstruction of Surrounding Existing Buildings
Author(s):
YAN Chao;  SUN Lian-wei;  CHENG Zi-cong
(Engineering General Institute of Shanghai Construction Group Co.,Ltd., Shanghai 201114, China)
Keywords:
deep foundation pit;  reconstruction of building;  interaction;  numerical simulation;  HS model
PACS:
TU473
DOI:
10.19815/j.jace.2021.08060
Abstract:
Based on the reconstruction of Shanghai Gymnasium and Shanghai Natatorium and the new sports complex project, the interaction between the reconstruction of existing buildings close to the deep foundation pit and the excavation of deep foundation pit was studied. The excavation of deep foundation pit and the “unloading-loading” reconstruction of surrounding existing buildings were simulated by large finite element software, and the interaction between them were analyzed. The optimal working condition of deep foundation pit excavation and surrounding existing building reconstruction was further discussed. In addition, on the basis of the optimal working condition, combined with the reinforcement of the passive area of the foundation pit, the stiffness of the retaining structure and the influence of their superposition on the deep foundation pit and surrounding buildings were further discussed. The results show that the most unfavorable condition is the loading reconstruction of the surrounding buildings when the foundation pit is excavated to the second support, which should be avoided in the actual construction. The optimal condition is unloading reconstruction of the surrounding buildings after the first support of the foundation pit is completed, and the loading reconstruction of the surrounding buildings after the second support of the foundation pit is completed. Under the optimal working conditions and other equivalent conditions, the impact of passive area reinforcement of foundation pit on foundation pit and surrounding buildings is greater than that of foundation pit retaining structure strength. The research results can provide basis and reference for future similar engineering construction.

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Last Update: 2021-11-01