Statistical Analysis of Beijing Subway Thin-walled Diaphragm Wall Foundation Pit Deformation Law

Objective The thickness of diaphragm walls significantly affects the amount and mode of foundation pit deformation, thin-walled diaphragm walls are especially sensitive to excavation and edge loads of foundation pit. Therefore, it is necessary to study the deformation law of foundation pit diaphragm...

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Published inChengshi Guidao Jiaotong Yanjiu Vol. 27; no. 7; pp. 127 - 132
Main Authors ZHU Jianxun, YANG Chunyang, LI Yongwei, ZHAO Zhitao, ZHONG Qiaorong, SONG Yunxing
Format Journal Article
LanguageChinese
Published Urban Mass Transit Magazine Press 01.07.2024
Subjects
foundation pit deformation
metro
thin-walled diaphragm wall
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Summary:Objective The thickness of diaphragm walls significantly affects the amount and mode of foundation pit deformation, thin-walled diaphragm walls are especially sensitive to excavation and edge loads of foundation pit. Therefore, it is necessary to study the deformation law of foundation pit diaphragm walls with different thicknesses in Beijing Subway. Method Taking six thin-walled diaphragm wall station foundation pit projects in Beijing Subway as examples, statistical analysis is conducted on monitoring data of ground vertical deformation, diaphragm wall top vertical deformation, horizontal displacement of diaphragm walls, and axial force of steel supports using statistical methods. Result & Conclusion The thin-walled diaphragm wall foundation pit ground deformation can be classified into heave-subsidence type and subsidence type, with a higher proportion of heave ground deformation. During soil mass excavation phase, the diaphragm wall exhibits a rapid upheaving trend, followed by a slight rebound of wall to
ISSN:1007-869X
DOI:10.16037/j.1007-869x.2024.07.022