A method for strengthening soft soil foundation by temperature-increasing vacuum preloading method

Abstract

The invention relates to a method for reinforcing a soft soil foundation by using a calescence type vacuum preloading way. The method comprises the steps of: introducing a foundation heating system on the basis of a regular vacuum preloading way; and keeping an under-film vacuum pressure and a temperature of shallow-layer soft soil in a reinforcing region respectively above 80 kPa and 62 DEG C within a period of time of a reinforcing period so as to rapidly vaporize pore water of foundation soil and pump the vaporized pore water by vacuum extraction equipment to cause sedimentation of the foundation. Compared with the prior art, the method for reinforcing the soft soil foundation by using the calescence type vacuum preloading way has the advantages of shorting the construction period, improving reinforcing effects, reducing settlement after the construction, increasing the bearing capacity of foundation soil and the like.

Description

technical field [0001] The invention relates to a reinforcement treatment method suitable for saturated cohesive soil foundations such as silt, muddy soil, and dredging fill, in particular to a temperature-increasing vacuum preloading method for reinforcing soft soil foundations. Background technique [0002] The vacuum preloading method is to first lay a sand cushion on the surface of the soft ground that needs to be reinforced, then insert a vertical drainage channel, and then use an airtight sealing film to isolate the reinforcement area from the atmosphere, and finally vacuumize the reinforcement area through special equipment. Negative pressure conditions are formed in the foundation of the area, and under the action of the internal and external pressure difference, the foundation soil undergoes drainage consolidation, the effective stress increases, and the strength increases. This construction method was first proposed by Professor W.Kjellmam of the Royal Swedish Inst...

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Problems solved by technology

[0004] ① The maximum preload load that can be achieved is small, generally around 80kPa, and the ability to eliminate settlement is limited;

[0005] ②The vacuum preloading method has a long processing period, and the full-load period can generally reach 3 months or even longer;

[0006] ③The reinforcement effect is relatively poor near the treatment boundary, and the uneven settlement is obvious;

[0007] ④ In the later stage of vacuum pumping, the secondary consolidation settlement is obvious, and the post-construction settlement is relatively large

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