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Method for reinforcement treatment of soft soil foundation by combining vacuum preloading and microorganism sand fixation technology

A soft soil foundation and microbial technology, which is applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of poor preloading effect and sandy soil layer preloading effect, so as to improve the strength of the foundation, shorten the construction period, Effect of preventing liquefaction of sandy soil foundation

Active Publication Date: 2018-12-14
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

However, the vacuum preloading method also has significant disadvantages: that is, vacuum preloading is only effective for soft soils such as silty soft clay on the surface of soft soil areas, and the preloading effect for the underlying sandy soil or sand-mixed silt is very effective. Difference
On the basis of this experimental theory, combined with the fact that the preloading effect of vacuum preloading technology on sandy soil strata is not good, the present invention intends to explore a method of combining vacuum preloading with microbial induced sand Various types of sandy soil and sandy soil and clay interbedded with various complex soft soil foundations for foundation treatment

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  • Method for reinforcement treatment of soft soil foundation by combining vacuum preloading and microorganism sand fixation technology
  • Method for reinforcement treatment of soft soil foundation by combining vacuum preloading and microorganism sand fixation technology

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Embodiment Construction

[0029] The present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] Such as figure 1 , figure 2 As shown in the figure, 1-plastic film; 2-sand cushion; 3-film and hose interface; 4-hose; 5-hole drainage pipe; 6-water collection tank; 7-water pump;

[0031] The method of vacuum preloading combined with microbial sand-fixing technology to strengthen and treat soft ground comprises the following steps:

[0032] 1) Leveling the site: dig 0.5m up and down on the soft soil foundation site, and level the site. The soft soil foundation includes silt layer, sand-mixed silt layer, fine sand layer, medium sand layer and coarse sand layer from top to bottom;

[0033] 2) Set drainage holes: In a flat site, use a drilling rig to drill drainage holes, and the drainage holes are arranged parallel to the coarse sand layer;

[0034] 3) Buried drainage belts and hoses: install drainage belts in the drainage hole...

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Abstract

The invention discloses a method for reinforcement treatment of a soft soil foundation by combining vacuum preloading and microorganism sand fixation technology. The method comprises the following steps of (1) ground leveling, (2) drainage hole arrangement, (3) drainage strip and hose burying, (4) sand cushion layer laying, (5) plastic sealing film laying, (6) connection of a hose with a vacuum pump and a water pump, (7) negative pressure microorganism induction treatment and (8) drainage and vacuum preloading. Firstly, sandy soil is solidified by microorganism sand fixation, and then consolidation of soft soil in a silt layer is carried out by vacuum preloading. Compared with a traditional single vacuum preloading method, the method for reinforcement treatment of the soft soil foundationby combining vacuum preloading and the microorganism sand fixation technology can significantly improve the strength of the foundation, shortens the construction period and prevents liquidation of a sandy soil foundation.

Description

technical field [0001] The invention belongs to the technical field of soft soil strengthening treatment, and in particular relates to a structure and method for strengthening and treating soft soil foundation with vacuum preloading combined with microbial sand-fixing technology. Background technique [0002] Soft soil is a kind of regional special soil with low strength, high compressibility and high sensitivity. It is widely distributed in 38 cities in 11 coastal provinces (autonomous regions and municipalities) with the most concentrated population and the most developed economy in my country. The total area is about 280,000 square kilometers. At present, with the rapid advancement of the urbanization process, the above soft soil areas have carried out large-scale infrastructure construction one after another, and a large area of ​​soft soil foundation needs to be manually treated to improve the strength of the soft soil foundation and reduce the post-construction settleme...

Claims

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Application Information

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IPC IPC(8): E02D3/10E02D3/12C04B28/00
CPCC04B28/00C04B2111/00732E02D3/103E02D3/123C04B2103/0001C04B22/124C04B22/106C04B24/126C04B22/147C04B2103/0094C04B22/0026
Inventor 黄伟李琳温珂珺李俊杰邓晓佳董倩卜常明张俊珂刘世慧李阳苏佩东杜康
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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