ABSTRACT：The technology proposed in this paper is applicable to the construction of metro tunnel by adjacent excavation in water-rich area and dense building group. It is aimed the excavation scope of tunnel by adjacent excavation in water-rich area, the surrounding rock stability of tunnel vault in strongly weathered strata is poor, and it is necessary under-cross a densely populated residential area with strict requirements on ground subsidence. The conventional construction technology of tunnel by adjacent excavation can not guarantee the safety and stability of tunnel the houses above it. In order to ensure the construction safety and not affect the construction progress of tunnel by adjacent excavation, the construction technology of tunnel by adjacent excavation in waterrich area and strongly weathered strata under dense building group is adopted to improve the construction safety of tunnel by adjacent excavation and speed up the construction progress. This technology is in process, easy to operate, economical and reasonable, easy to promote, simple and effective, and has a certain degree of advancement. It is suitable for the construction of metro tunnel adjacent excavation in water-rich area and dense building group, and has broad prospects for promotion and application.

Keywords –water-rich area; stronglyathered strata; metro tunnel; adjacent excavation