深厚饱和软土区基坑支护设计与监测成果分析

以地处深厚饱和软土区的南京某深基坑工程为背景,采用较大直径钻孔灌注桩加二层钢筋混凝土支撑作为支护结构,三轴深搅桩作止水帷幕,根据基坑开挖过程中获得的现场监测数据,进行归纳和分析,总结了位移和轴力等曲线的变化规律。实践结果表明对于类似形状规则的深基坑,采用常规的角撑加对撑的支护体系能满足工程的要求,优点在于其结构受力均匀合理,施工安全方便。

Analysis of Foundation Pit Supporting Design and Monitoring Results in Deep Saturated Soft Soil Area

For a project located at the deep saturated soft soil area in Nanjing,the supporting design method of large diameter bored piles with two layers of reinforced concrete support and triaxial deep mixing piles adopted to seal groundwater were used for the deep excavation engineering,the monitoring data were analyzed in detail on the process of pit excavation,the study gives the regularity of variation of the displacement and axial force curve.The results indicate that,in a similar way to regular shape of deep foundation pit,it is reasonable to use symmetric supporting system in structural mechanics and construction convenience.