Field tests on shallow treatment of super-soft ground by vaccum preloading method

The key technical problem of shallow treatment of super-soft ground is how to make the mud drainage consolidation as soon as possible, which has high water content and little bearing capacity. The traditional vacuum preloading process which is used for strengthening general soft ground is improved. A new vacuum preloading construction method without sand cushion, which fits reinforcement of the shallow foundation of fresh hydraulic fill mud, is proposed, and it is studied by field tests in Wenzhou Private Economic Development Zone. The transmission of vacuum pressure, surface settlement and pore pressure dissipation are studied. By comparing the physical and mechanical indicators as well as bearing capacity between reinforced foundation and fresh hydraulic fill mud, the results show that the consolidation effect of hydraulic fill layer is evident which meets the load requirements of the follow-up construction. A practical calculation method for increasing soil strength and bearing capacity, which fits the shallow treatment of super-soft ground, is proposed. It is successfully used to predict the reinforcing effects of large processing area.