摘要:杭州下沙碧桂园位于杭州下沙大学城北生态居住区地块，场地紧靠钱塘江，属于钱塘江冲海积平原，在基坑开挖影响范围内，为渗透性强的砂质粉土，如在渗流作用下边坡稳定性差。建设项目为大型商品住宅区，占地面积65711m²，建筑面积268748m²，其中地下建筑面积84460m²；基坑规模大，平面尺寸240m×260m，基坑周长1000m，深浅基坑临边长度360m，土方工程量达到430000m³；基坑大面积开挖深度9.5m~11.0m，局部13.0m；采用建筑业10项新技术复合土钉墙支护方案，通过科学管理，规范施工，创造了用简单的支护方案快速高质量完成庞大地下空间工程的成绩。

Abstract: Hangzhou Country Garden project is located on the north of Hangzhou XiaSha University Town ecological residential plots, the venue is close to Qian Tang river, which belongs Qian Tang river alluvial and coast plain. In the place which can be influenced by the excavation is the sandy silt with strong permeability, which shows poor stability in the effect of seepage. This project is a large commodity residential covers an area of 65711m², and the construction floor area is 268748m² including 84460m² underground. The plane size of large excavation is 240m×260m and the perimeter is 1000m. The edge length of foundation pit is 360m, and the volume of earthwork is 430000m³.The depth of excavation in large area is 9.5m-11.0m, 13.0m in some local place. It's adopted with 10 new technologies in soil nailing wall support in building industry. Through the scientific management and standardized construction works, creating the achievements which using simple supporting program to complete a huge underground program rapidly and in a high quality.