Abstract:

It is difficult for mined tunnel with shallow cover to cross waterrich sand stratum. Taking a tunnel in Shenzhen as an example, the paper introduces the construction case of largespan, flattop, shallow buried and small curve radius tunnel successfully crossing stratum mainly consisting of quicksand and muddy sand. A series of measures taken during the tunnel excavation ensured the successful tunnel breakthrough and effective control of the ground surface settlement.

Key words: waterrich sand stratum, mined tunnel with shallow cover, ground surface settlement