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Operation method for consolidating soft soil foundation by pneumatic flerry vacuum preloading method

A vacuum preloading method and soft soil foundation technology, applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of difficult transmission of deep vacuum pressure, low soil permeability, long reinforcement time, etc. Economic and social benefits, the effect of increasing permeability and accelerating consolidation

Active Publication Date: 2005-09-07
SOUTHEAST UNIV
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Problems solved by technology

Due to the well resistance effect of the vertical drainage board, the vacuum degree (negative pressure) decays rapidly along the depth. Generally, the effective treatment depth is about 15m. For deep soft soil foundation, it is difficult to effectively reinforce the deep part
(2) The vacuum preloading method requires a long time for reinforcement
Although vacuum preloading accelerates foundation consolidation to a certain extent compared with surcharge preloading, the consolidation rate is still slow for soft soils with extremely small permeability coefficients, often taking several months
[0004] The main reasons for these difficulties are that the deep vacuum pressure is difficult to transmit and the soil permeability is too small.

Method used

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  • Operation method for consolidating soft soil foundation by pneumatic flerry vacuum preloading method
  • Operation method for consolidating soft soil foundation by pneumatic flerry vacuum preloading method

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Embodiment Construction

[0023] The invention is based on the conventional vacuum preloading method to strengthen the soft soil foundation and combined with the air pressure splitting technology to form a new type of soft foundation treatment technology. The arrangement method of the drainage board on the plane is as follows: the ordinary plastic drainage board 2 and the air guiding plastic drainage board 3 are arranged horizontally apart, and the ordinary plastic drainage board 2 and the air guiding plastic drainage board 3 between two adjacent rows of drainage boards are arranged staggered. , That is, the left, right, front, and rear of the ordinary plastic drainage board 2 are all air-conducting plastic drainage boards 3, and the left, right, front and rear of the air-conducting plastic drainage board 3 are all ordinary plastic drainage boards. The adjacent ordinary plastic drainage plates 2 form an equilateral triangle on the plane, and the adjacent air-guiding plastic drainage plates 3 also form an e...

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Abstract

The invention relates to an air pressure splitting off vacuum pre-pressing method to reinforce soft soil that is a method to process groundsill. The process is that: cleaning the field, laying plastic draining board, setting high pressure gas transferring system, setting the vacuum system, inflicting high pressure gas, pumping to vacuum, and repeating to inflict high pressure and pumping according to the demand.

Description

Technical field [0001] The invention is a foundation treatment method, which is suitable for the treatment of soft soil foundation and belongs to the technical field of civil engineering. Background technique [0002] The method of vacuum preloading to strengthen the foundation was first proposed by W.Kjellman of the Royal Swedish Geological Institute in 1952. In 1958, the Philadelphia Airport used the method of vacuum well point precipitation and sand wells for the first time to treat the foundation of the airstrip extension project. Afterwards, Japan, Finland, the Soviet Union, France, the United States, Sweden and other places have conducted research and application of this method. With the solution of key issues such as vacuum equipment efficiency, gas-water separation technology, and sealing technology, some relatively mature The technology of using the principle of vacuum preloading to strengthen soft soil foundation has been widely used in engineering practice. Our country...

Claims

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Application Information

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IPC IPC(8): E02D3/10
Inventor 刘松玉洪振舜章定文
Owner SOUTHEAST UNIV
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