深基坑开挖引起邻近地层动态变形案例

Dynamic Deformation Of Adjacent Strata Caused By Deep Foundation Pit Excavation

针对天津某深大基坑施工对周边历史风貌保护建筑水平变形的影响,利用FLAC3D软件对基坑施工进行模拟,分析开挖过程对土体地表变形及影响深度范围内变形情况,并对比监测成果。结果表明:模拟值和实际监测数据基本吻合。挖至坑底时,模拟预测坑外土体最大水平变形量为77.2mm,周边历史风貌保护建筑水平变形量最大为20.2mm,研究结果对工程安全施工可起到指导作用。

Based on the horizontal deformation influence of deep foundation pit construction on the historical buildings,FLAC3D was used to simulate the excavation and support process of a foundation pit in the soft soil area.The surface deformation and the soil deformation within the affected depth of foundation pit excavation are analyzed and compared with the monitoring results.The results of study are as follows.The simulated values are basically consistent with the actual monitoring data.Digging to the bottom of the pit,we can predict the biggest horizontal displacement of soil is 77.2 mm,and the value is 20.2 mm in the history style construction.Therefore,the results of the study can play a guiding role in the engineering construction safety.