高灵敏性软土深基坑变形影响因素分析及控制措施

Analysis of Influencing Factors on Deformation of Deep Foundation Pit in High Sensitivity Soft Soil and Its Control Measures

本文依托宁波地铁3号线仇毕车站高灵敏性软土地铁深基坑施工成功案例,对车站基坑在施工过程中的监控量测数据进行探讨分析,从围护结构墙体变形、基底土体隆起、基坑周围地表沉降三个方面进行研究得出影响基坑变形的因素,并详细阐述宁波地铁3号线在地基加固、内支撑竖向间距、钢支撑预加轴力、基坑开挖空间效应、基坑降水等方面所采取的针对性措施,以期为类似工程提供借鉴。

Relying on the successful case of deep foundation pit construction in high sensitive soft soil of Qiubi Station of Ningbo Metro Line 3,this article discussed the monitoring and measurement data of the station foundation pit during the construction process,and obtained the factors influencing the deformation of the foundation pit in the aspect of studying the deformation of the retaining structure wall,the uplift of the foundation bottom soil and the ground settlement around the foundation pit.In addition,it expounded in detail the targeted measures taken by Ningbo Metro Line 3 in strengthening the foundation,the vertical spacing of internal supports,the pre-axial force of steel supports,the spatial effect of foundation pit excavation,the dewatering of foundation pit and so on,with a view to providing reference for similar projects.