岩土工程学报2024，Vol.46Issue(1)：199-206,8.DOI:10.11779/CJGE20221074
单侧卸荷诱发深基坑的不对称性变形特性与机制
Asymmetrical deformation characteristics and mechanisms of deep excavations induced by one-side unloading
摘要
Abstract
With the advancement of urban renewal,more and more excavations are being constructed under one-side unloading condition caused by the existing adjacent ones,resulting in different deformation characteristics and mechanisms compared to those of the normal excavations.Therefore,with the support of an asymmetrical deep excavation(34.3 m)that is induced by the adjacent one-side unloading in Shanghai,the site monitoring data(i.e.deflection of diaphragm wall,soil displacement,ground surface settlement,struct axial force and earth pressure)are collected and analyzed.The asymmetrical deformation characteristics of the deep excavation induced by unilateral unloading are then summarized,followed by a discussion of the corresponding mechanisms.The results show that the one-side unloading leads to the asymmetrical deformation of diaphragm wall.The displacement at the unloaded side reduces by 76%while that at the non-unloaded side increases by 72%,resulting in an increase of more than one times of the maximum surface settlement at the non-unloaded side.All these changes are the combined results of three mechanisms,including the reduced soil pressure at the unloaded side,the horizontal movement of retaining structures,and the change of the equivalent stiffness of supports in the unloaded direction.Therefore,the asymmetrical deformation of excavations should be fully considered during their design and construction.The equivalent stiffness of supports should be determined appropriately,and the rational monitoring warning indexes should be proposed for the unloading side and non-unloading side,respectively.关键词
深基坑/监测分析/不对称变形特性/土压力/机制Key words
deep excavation/monitoring analysis/asymmetrical deformation characteristic/earth pressure/mechanism分类
建筑与水利引用本文复制引用
邱滟玲,丁文其,赵腾腾,王校勇,乔亚飞..单侧卸荷诱发深基坑的不对称性变形特性与机制[J].岩土工程学报,2024,46(1):199-206,8.基金项目
国家自然科学基金重大项目(52090083) （52090083）
上海市晨光计划项目(20CG26) （20CG26）
上海市苏州河深隧项目横向课题 （）
