南京某扩建工程深基坑面积虽小,但基坑平面形状不规则、开挖深度较深,达10.5m,且场地土质差,地下水丰富。基坑两边与原地下室相连,另两边紧贴马路,且西侧距南京地铁一号线新模范马路站较近,周边环境复杂,对变形控制要求高,基坑支护设计与施工难度大。 Although the area of ​​a deep foundation pit in an extension project in Nanjing is small, the shape of the foundation pit is irregular with a deep excavation depth of 10.5m, and the site has poor soil quality and abundant groundwater. The two sides of the foundation pit are connected with the original basement, the other two sides are close to the road, and the west is close to the new model road station of Nanjing Metro Line 1. The surrounding environment is complex and requires high deformation control. The design and construction of foundation pit support are very difficult.