南京国际博览中心Ⅱ期扩建工程基坑工程设计

The Excavation Engineering Design of the Second Expansion Project of Nanjing International Expo Center

南京国际博览中心基坑工程紧邻地铁一号线元通站~奥体中心站区间隧道,基坑开挖深度约10m,局部开挖深度达10.40m。在河西软土地区类似基坑规模条件下基本选用2层内支撑体系,而本项目结合场地条件,大胆采用了常规钻孔灌注桩桩顶卸载加1层钢筋混凝土支撑的挡土结构形式,通过数值模拟分析,该结构形式可确保基坑及地铁区间隧道的安全稳定,结合工程实测数据,验证了基坑工程设计的合理性,为类似规模和地质条件的基坑工程提供了一种新的设计思路。

The excavation of Nanjing International Expo Center is near the Yuantong^AOti running tunnel of Nanjing Metro line1,The depth of excavation is about 10 m,partial excavation depth reach 10.4m.The basic choice is two inner supporting system as usual under the similar size excavations in Hexi soft soil area. Based on the site condition, unloading on the bored pile and one inner supporting system is adopted in this project.By the analysis of numerical simulation, it can ensure the safety and stable of the excavation and the subway tunnel. The monitoring data verify the rationality of the project. So it provides a new design idea for the similar size & geological condition excavations.