Combined with the construction of the pass of Donghai road in Qingdao,the author discusses the comprehensive precipitation technology of the subsurface excavation of the pass of the urban main roads in Binhai district,detailedly introduces the application of the vacuum dewatering technology in the tunnel,to provide the reference for the similar projects.

In combination with the barged-in fill subgrade treatment project with large area in a certain new town overlooking the harbor in Shanghai City, the paper tests and studies on the problem of strongly ramping consolidated barged-in subgrade with large area by vacuum dewatering with low energy.

Reinforcement of soft soil foundation with hydraulic fill sand based on the method combined with dynamic consolidation and vacuum drainage;

When pressed air is injected into the soft foundation as vacuum drainage is being carried on,water in porous soils may be pushed out of the foundation through the pipes for vacuum drainage,which can obviously improve the efficiency of vacuum drainage.