软土地区坑中坑对悬臂式支护结构的影响研究

Study on Influence of Pits in Foundation-pit on Cantilevered Retaining Structure in Soft Soil Area

在软土地区,坑中坑对基坑工程的安全性影响较大。结合某基坑工程实例,分析了坑中坑对悬臂式支护结构水平位移的影响。计算结果表明:对于软土地区的悬臂式支护结构,当内坑与支护结构的距离在一倍的基坑开挖深度范围内时,内坑对支护结构的水平位移影响较大,且内坑离支护结构越近,影响越显著。增大支护结构的刚度,对支护结构水平位移的影响并不明显。

In soft soil area, pits in foundation-pit have large impact on safety of foundation pit engineering. Combining with a project case, the effect of pits in foundation-pit on cantilevered retaining structure＇s horizontal displacement was analyzed. The result shows that, for the cantilevered retaining structure in soft soil area, the inner pit has larger influence on the structure＇s horizontal displacement when the distance therebetween is in the range of the doubled excavation depth and, the closer the inner pit to the structure, the greater the influence. The impact on the structure＇s horizontal displacement is not significant when the rigidity of the structure increases.