摘要
为研究富水砂层地区基坑坑外降水对周边环境及支护结构的影响,文中以佛山某市政基坑工程为例,通过现场实测总结分析坑外降水期间周边地表沉降、支撑轴力、桩体深层水平位移等变形规律。研究结果表明,该特定地层条件及施工工况下,周边水位下降125.9%,地表沉降增加105.99%,钢支撑轴力减少15.87%,桩体深层水平位移不同程度减小,说明坑外降水可有效减小围护结构的受力与变形,但同时也加剧了地表沉降及不均匀沉降,坑外降水在环境复杂的城区应谨慎使用。
This paper studies the influence of dewatering outside the pit on the surrounding environment and supporting structure in the area of water-rich sand layer.Taking a municipal foundation pit project in Foshan as the case,the deformation laws of surrounding surface settlement,supporting axial force,and deep horizontal displacement of pile during dewatering outside the pit are summarized and analyzed.The results show that,under the specific formation conditions and construction conditions,the surrounding water level decreased by 125.9%;the surface settlement increased by 105.99%;the axial force of the steel support decreased by 15.87%;the deep horizontal displacement of the pile body decreased to different degrees.The dewatering outside the foundation pit effectively reduces the stress and deformation of the envelope structure,which also aggravates the surface settlement and uneven settlement.Therefore,the dewatering outside the foundation pit should be used cautiously in the urban area with complex environment.
作者
陈聪
王建
李超
彭勇
CHEN Cong;WANG Jian;LI Chao;PENG Yong(Guangdong Zhonggong Architectural Design Institute Co.,Ltd.,Guangzhou 510670,China;Guangdong Yihua Transportation engineering Testing Co.,Ltd.,Guangdong Zhongshan 528455,China)
出处
《低温建筑技术》
2024年第4期59-62,67,共5页
Low Temperature Architecture Technology
基金
广东省住房和城乡建设厅科技创新计划(2022-K4-552548)。
关键词
坑外降水
地表沉降
钢支撑轴力
变形分析
dewatering outside the foundation pit
surface settlement
axial force of steel support
deformation analysis
