软黏土地区深基坑开挖对周边环境的影响实测分析

Actual Measurement Analysis of Impact of Deep Foundation Pit Excavation on Surrounding Environment in Soft Clay Area

为研究软黏土地区深基坑开挖对周边环境的影响,结合上海某深基坑开挖项目,在地表、围护结构和邻近建(构)筑物布设监测点位并进行连续监测,通过对监测数据进行整理分析,得出软黏土地区深基坑开挖过程中围护体深层位移呈弓形变化、周边建筑沉降随深度增大而加大,且在无支撑情况下下降速率较快等特点,最后基于实测结果提出了软黏土地区深基坑开挖施工过程中的变形控制措施,以减少基坑开挖对周边环境的影响。

To study the impact of deep foundation pit excavation in soft clay area on the surrounding environment,combined with a deep foundation pit excavation project in Shanghai,the monitoring points are set on the surface,retaining structures and adjacent buildings(structures)for continuous monitoring.Through sorting out and analysis of the monitoring data,it is concluded that that the deep foundation pit in the soft clay soil area during excavation has the characteristics of arched deep displacement of retaining body,increased settlement of surrounding buildings with the increase of depth,and rapid decline rate without support.Finally,based on the measured results,the deformation control measures in the process of deep foundation pit excavation in soft clay area are put forward to reduce the impact of foundation pit excavation on the surrounding environment.