Excavation Technology of Deep Trench in Underground Passage in project of Overpass Linking Sanxiang Road and Tongjing Road in Suzhou City

摘要

The overpass lies in the crossing of Sanxiang Road and Tongjing Road in Suzhou City and is designed as a three stories containing upper span, lower span and circular cross. The mileage piles driven in the underground passage are numbered K0-244.15-K0+226.5. Thereinto the passage numbered K0-050-K0+050 is excavated underground and those signed K0-244.15-K0-050 and K0+050-K0+226.5 are excavated openly. At the same time the minimum clear width is 17.5m. It's a complicated process for the excavation of deep trench involving the support of trench, dewatering and drainage technique, construction management, the excavation sequence and manner, construction monitor, etc. In the process of construction, the program that insure the construction process and quality is adopted by comparison the scheme that the trench should be supported firstly and excavated subsequently that opposite to the former in the sequence of construction and good social benefits and economic benefits are made.