Vacuum pre-compaction and electro-osmosis combined reinforcing device and method for muck foundation

Abstract

The invention discloses a vacuum pre-compaction and electro-osmosis combined reinforcing device and a method for a muck foundation. Sand-free cushion vacuum pre-compaction and electro-osmosis are combined to remove pore water and air under the super-soft musk foundation. Through the vacuum pre-compaction effect at the earlier stage, most of free water in the soil is removed, and part of the free water and weak bound water which cannot be removed by the vacuum pre-compaction can be further removed via the electro-osmosis, thus the reinforcing effect can be greatly improved, the manufacturing cost is increased a little on the basis of the vacuum pre-compaction, and the economical efficiency is remarkable.

Description

technical field [0001] The invention relates to a method for reinforcing a large-area ultra-soft silt foundation, which is suitable for the treatment of the ultra-soft silt foundation or dredging filling foundation, and belongs to the technical field of civil engineering. Background technique [0002] Sandless cushion vacuum preloading technology, vacuum preloading was proposed by Swedish scientist W.Kjellman in 1952, and was first applied to the foundation treatment project in the expansion of the airstrip in 1958 at the Philadelphia Airport in the United States. Our country began to study and apply this method in the 1980s, and a lot of work has been done in construction technology and reinforcement theory. It has been widely used in the treatment of soft ground in the fields of civil engineering, port engineering and traffic engineering. [0003] Electroosmotic precipitation technology, Reuss first discovered the phenomenon of electroosmosis in clay in 1809, and Casagran...

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Problems solved by technology

[0004] However, engineering practice shows that although the vacuum preloading technology of sandless cushion is an economical and effective soft ground treatment method, because the vacuum degree decays rapidly along the plastic drainage board with depth, in ultra-soft silt with a small permeability coefficient, The effect of treatment at deeper depths is poor, that is, except for the hard crust layer with a thickness of 1m to 3m on the surface, the reinforcement effect of the soil below is not satisfactory

Moreover, the bearing capacity of the reinforced foundation is difficult to exceed 80kPa

However, the simple electroosmosis method has disadvantages such as large power and electrode consumption, relatively high cost, air bubbles escaping during the electroosmosis process affect the drainage effect, seepage drainage mainly occurs during the electroosmosis process, and the soil is not consolidated.

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