Abstract:

The shield TBM launching shaft of Wuhan Yangtze River Tunnel Project is located on the south bank of Yangtze River, about 500m away from the Yangtze River, where the geology is of first bench terrace with poor geological condition and high level of artesian water connecting with the water in Yangtze River. Furthermore, the excavation of the foundation pit is deep and the surrounding environment is complicated. This paper introduces some key construction technologies of deep foundation pit in soft soil with high artesian water pressure such as water proofing, dewatering by reducing pressure and foundation bottom consolidation, and evaluates the settlement in surrounding area caused by construction according to relevant specifications and empirical formula.