摘要
为了揭示深厚软土中弧形深大基坑施工期的变形与受力规律,依托南京某工程开展现场实测研究,着重分析了施工工况对深层水平位移、墙顶竖向位移、地表沉降、支撑轴力与立柱竖向位移的影响规律。研究结果表明:地连墙深层水平位移随深度先减小后增大,最大值为51.25mm;墙顶位移和坑外地表沉降均存在显著的空间效应,地表沉降最大值达180mm,承压含水层降水引起的软土固结是导致地表沉降突增的主因;水平土压力主要由第1、4、5道支撑承担。
To reveal the deformation and stress patterns during the construction phase of a deep,large-scale curved excavation in deep soft soil,field monitoring was conducted at a project site in Nanjing.The study focused on analyzing the influence of construction conditions on deep horizontal displacement of diaphragm wall,wall-top vertical displacement,ground surface settlement,support axial force,and column vertical displacement.Results indicate:Deep horizontal displacement of diaphragm wall first decreases then increases with depth,peaking at 51.25 mm;wall-top displacement exhibits significant spatial variation,Maximum ground surface settlement outside the pit reached 180 mm;-Ground surface settlement surged after dewatering of the confined aquifer commenced;-Concrete support axial force peaked at 5090.51 kN during the fourth support installation.The maximum ground surface settlement outside the pit reached 180 mm,with a sudden increase after dewatering of the confined aquifer commenced.Concrete support axial force peaked at 5090.51 kN during the fourth support phase,while horizontal earth pressure was primarily borne by the first,fourth,and fifth support phases.
作者
王冰
彭建勇
马宏伟
陈鑫
WANG Bing;PENG Jianyong;MA Hongwei;CHEN Xin(Second Engineering Co.,Ltd.,China Railway Fourth Bureau Group,Suzhou 215131;School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001)
出处
《现代隧道技术》
北大核心
2025年第S1期739-747,共9页
Modern Tunnelling Technology
基金
中铁四局集团有限公司科技研发项目(2021-02)
关键词
深基坑
淤泥质软土
开挖支护效应
施工监测
Deep excavation pits
Silty soft soil
Excavation support effects
Construction monitoring
