Vacuum Preloading Method Combined with Reinforcement Soft foundation Technology

Vacuum preloading method combined with reinforcement soft foundation technology

Technical content

(1) The vacuum preloading method is to set up a sand well or a plastic drainage board in the soft clay foundation to be reinforced, and then lay a sand cushion on the ground, which is covered with a gas-tight sealing film to isolate the soft soil from the atmosphere, and then pass through the embedding. The water filter pipe in the sand cushion is evacuated by a vacuum device to discharge the air inside the film, thereby generating a gas pressure difference inside and outside the film, and this part of the air pressure difference becomes a load acting on the foundation. The foundation is consolidated as the isotropic stress increases.

(2) The vacuum preloading combined preloading method is based on the vacuum preloading, after the vacuum degree of the membrane reaches the design requirement and is stabilized, the staged loading is carried out, and the stacking rate is controlled according to the deformation of the foundation and the change of the pore water pressure. . Before the preloading construction, the sealing film must be covered with a protective layer such as non-woven geotextile and clay (fly ash) for protection, then layered backfilled and compacted. Compared to pure preloading, the loading rate is relatively fast. After the end of the loading, enter the joint preloading phase until the rate of deformation of the foundation meets the design requirements, then stop the vacuuming and end the vacuum combined with the preloading.

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