地下过街道深基坑支护设计与施工研究

Research on Deep Foundation Pit Supporting Design and Construction for Underground Passageway

南京市某大型地下过街通道基坑支护工程,开挖深度8.45m,平面布置形状复杂,且场地周边环境狭小,侧壁土层以淤质粉土为主,地下水位较高,设计和施工难度大。文章详细介绍了基坑设计方案、降水方案并对土压力、支撑轴力、支护桩弯矩和基坑监测数据进行了对比分析。

The pit of underground passage in Nanjing was excavated to a depth of 8.45 meter . The location of the pit lies in the downtown district , whose construction field is somewhat narrow as well as plane layout is complicated. Furthermore, the side of pit is layered with very soft sandy silt , which bears the characteristic of strong permeability. Besides, the ground water level is only one meter below ground surface. The design and dewatering scheme are presented in this paper along with the discussion of calculation results, such as the earth pressure, bracing system forces and moment diagram of piles in row, etc. Finally, the datum of pit excavation monitoring are also discussed .