深圳滨海地区超长深基坑监测实例分析

Case Analysis on Super-long Deep Foundation Pit Monitoring in Shenzhen Coastal Areas

文章以深圳滨海大道改造工程下沉隧道基坑为研究背景,通过监测围护墙体侧移、立柱竖向位移、地表沉降和支撑受力,开展关于滨海地区超长深基坑施工力学效应研究,分析总结基坑受力和变形规律。研究表明:截至2022年12月13日,基坑全线基本开挖完毕,最大开挖深度为35 m,实测数据显示墙体侧移,地表沉降、支撑轴力和立柱沉降累计增量均小于设计容许值,基坑整体安全可控,研究成果可为超长深基坑开挖施工提供有益的借鉴。

This paper takes the foundation pit of the sinking tunnel of Shenzhen Binhai Avenue Reconstruction Project as the research background. By monitoring the lateral displacement of the retaining wall, the vertical displacement of the column, the surface settlement and the support force,the mechanical effect of the construction of the super-long deep foundation pit in the coastal area is studied, and the force and deformation law of the foundation pit are analyzed and summarized. The research shows that by December 13,2022, the excavation of the whole foundation pit had been basically completed;the maximum excavation depth is 35 m;the measured data show that the wall is laterally shifted;the cumulative increment of surface settlement, support axial force and column settlement is less than the design allowable value;the foundation pit is safe and controllable as a whole.The research results can provide useful reference for the excavation construction of super-long deep foundation pit.