Method for solidifying and processing soft soil foundation by draining water from plant cushion layer in vacuum

A technology of vacuum drainage and soft soil foundation, which can be applied in the fields of soil protection, infrastructure engineering, construction, etc., can solve the problem of reduction, and must go to farther river bottoms and seabeds to obtain, which cannot meet short-term land use needs, and the interval is long. and other issues to achieve low cost, short construction period and good results

Inactive Publication Date: 2011-09-21
SHANGHAI UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, due to the lack of land resources, the interval between reclamation and land reclamation to normal use was generally relatively long, maybe 5 or 6 years, and sometimes 8 or 9 years. However, some sites will be used in 1, 2 years, or even immediately after land reclamation. Obviously, this method can no longer meet the short-term land use needs, so it needs For foundation treatment, the treatment methods for soil with high clay content generally include vacuum preloading, surcharge preloading, vacuum surcharge combined preloading, etc. Due to the limitation of the source of surcharged materials and the conditions for aftermath, the vacuum preloading method is more widely used. many
However, due to less and less sand sources and higher prices, for example, the sand used in the Shanghai area is generally purchased from Jiangsu and other places, and the distribution of sand in the coastal area is gradually decreasing, and it must be obtained from the farther river bottom and seabed. The sand cushion has gradually become a limiting condition for the promotion and application of vacuum preloading. It is very urgent to find a new drainage cushion with good effect, low cost and environmental protection.

Method used

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  • Method for solidifying and processing soft soil foundation by draining water from plant cushion layer in vacuum
  • Method for solidifying and processing soft soil foundation by draining water from plant cushion layer in vacuum
  • Method for solidifying and processing soft soil foundation by draining water from plant cushion layer in vacuum

Examples

Experimental program
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Effect test

Embodiment 1

[0049] This example is a soft soil foundation treatment experiment of dredging filling in Shanghai area.

[0050] It has been 2 years since the site was filled and the treatment area of ​​the test area is 625m 2 (25m×25m), the thickness of the dredger fill is about 3.5m, and the permeability coefficient is less than 10-6cm / s. The current ground is covered with reeds and accumulated water. The bearing capacity of the foundation is 15Pa, and the equipment cannot enter the site. The implementation process of the test area is as follows:

[0051] 1) Manually lay down the reeds in the field in the same direction, and roll them flat, and at the same time detect the thickness of the dredged fill soil to be treated;

[0052]2) Manually insert plastic drainage boards vertically. The drainage boards are ordinary split type. The board spacing is 1.0m×1.0m. Side inclined pipe, etc.;

[0053] 3) Lay steel wire pipe main pipes horizontally and parallel at a distance of 12m, and lay an int...

Embodiment 2

[0060] This example is another site in the above ground treatment test, where the test parameters are different.

[0061] It has been 2 years since the site was filled by dredging. The treatment area of ​​the test area is 625m2 (25m×25m), the thickness of the dredged fill is about 3.5m, and the permeability coefficient is less than 10-6cm / s. The force is 15Pa, and the equipment cannot enter the field. The implementation process of the test area is as follows:

[0062] 1) Manually lay down the reeds in the field in the same direction, and roll them flat, and at the same time detect the thickness of the dredged fill soil to be treated;

[0063] 2) Manually insert plastic drainage boards vertically. The drainage boards are ordinary split type. The board spacing is 1.2m×1.2m. Side inclined pipe, etc.;

[0064] 3) Lay steel wire pipe main pipes horizontally and parallel at a distance of 15m, and lay an integral drainage board horizontally at a distance of 1.2m between two rows of...

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Abstract

The invention relates to a method for solidifying and processing soft soil foundation by draining water from a plant cushion layer in vacuum. The method comprises the following steps of: 1) crosswise placing and flattening a hollow plant; 2) inserting vertical draining plates and exposing the top ends of the draining plates; 3) paving a main tube and an integrated draining plate layer horizontally; 4) digging peripheral sealed ditches around, paving geotextile layers on the main tube and the integrated draining plate layer sequentially, and paving vacuum films on the geotextile layers; 5) starting vacuum equipment, running the vacuum equipment at low pressure and trying to vacuumize; 6) controlling a vacuum degree exertion speed, increasing the vacuum degree day by day from 20kPa at a speed of 2 to 5kPa per day until the vacuum degree is more than 85kPa and stabilizing the pressure; 7) covering water on the films during pressure stabilization; 8) monitoring parameters during vacuum exertion, finding out problems and correcting the problems timely; 9) drawing a sedimentation-time curve and a vacuum-degree-time curve; and 10) removing the vacuum equipment after the sedimentation-time curve is stabilized. Compared with the prior art, the method has the advantages of low cost, good effect and the like.

Description

technical field [0001] The invention relates to a method for treating soft ground in geotechnical engineering, in particular to a method for treating soft ground with vacuum drainage and consolidation of plant cushions. Background technique [0002] The application of soft soil foundation treatment has broad prospects. Due to the gradual economic development and relatively high population density in the eastern coastal areas, the available land resources in cities are gradually decreasing, and land reclamation projects are increasing day by day, such as Qingdao Haixi Bay Beihai Shipyard, Shenzhen Airport Expansion, Shanghai Nanhui District Lingang New City, Tianjin Lingang Industrial Zone, Wenzhou Peninsula Project, etc., and with the development of the city, there is a trend of increasing land reclamation projects. After land reclamation, a large amount of soft soil foundation is formed, which has the characteristics of flow, large deformation, high water content, high comp...

Claims

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Application Information

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IPC IPC(8): E02D3/10
Inventor 武亚军唐军武尹元璋刘伟张云达王辉邹道敏杨建波
Owner SHANGHAI UNIV
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