Consolidation method of soft earth foundation

A kind of soft ground and weak technology, which is applied in the direction of infrastructure engineering, soil protection, construction, etc., can solve the problems of high cost, long construction period, and high cost, and achieve the effect of increased precompression stress and significant social and economic benefits

Active Publication Date: 2010-01-27
SHANGHAI HARBOUR SOFT SOIL TREATMENT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that a large amount of earthwork is required, so the cost is high, the construction period is long

Method used

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  • Consolidation method of soft earth foundation
  • Consolidation method of soft earth foundation
  • Consolidation method of soft earth foundation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A sea reclamation project with an area of ​​350,000 square meters, the surface layer is a dredged sandy soil layer with a thickness of 5-6 meters, a water content of 50%, and a permeability coefficient of 10 -4 cm / s; the lower layer is silty soil layer with a thickness of about 18 meters, a water content of 90%, and a permeability coefficient of 10 -7 cm / s.

[0042] Design requirements: bearing capacity up to 80kPa.

[0043] like figure 1 and 2 As shown, follow the steps below for construction:

[0044] The first step is to use a mixing pile machine to spray high-pressure cement slurry into the soil layer while stirring at the periphery of the construction area, and the mixing amount is controlled at 12-20% (weight ratio) to make the soft soil harden into a solid structure. The cement-reinforced soil (water-stop wall 30) with water resistance, water stability and a certain strength, the thickness of the water-stop wall 30 is controlled at 0.6-1.5 meters, and the dep...

Embodiment 2

[0056] A sea reclamation project with an area of ​​200,000 square meters, the surface layer is dredged sandy soil with a thickness of 5-6 meters, a water content of 50%, and a permeability coefficient of 10 -5 cm / s; the lower layer is a silt layer with a thickness of about 16 meters, a water content of 55%, and a permeability coefficient of 10 -7 cm / s.

[0057] Design requirements: bearing capacity up to 100kPa.

[0058] Construction according to the following steps:

[0059] The first step is to spray high-pressure pure clay mud into the soil layer while stirring with a mixing pile machine at the periphery of the construction area, and the mixing amount is controlled at 20-30% (weight ratio), so that the soft soil hardens into a Integrity, water stability and a certain strength of cement reinforcement soil (water stop wall), the thickness of the water stop wall is controlled at 0.6 to 1.5 meters, and the depth is guaranteed to penetrate the dredged sand layer and enter the ...

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Abstract

The invention discloses a consolidation method of soft earth foundation. The method is used for consolidation treatment of hydraulically filled land area formed by large-area land reclamation by encircling the sea. The consolidation method of soft earth foundation is characterized by enhancing compressive pre-stress of soft sludge to be treated in folds by reducing ground water level, lifting water at low investment. Compared with existing methods, the consolidation method can help shorten 2/3 of conventional construction period, reduce the cost to 1/5-1/6 of conventional cost, thus the method has obvious social benefit and economic benefit.

Description

technical field [0001] The invention belongs to the field of soft soil foundation treatment, and in particular relates to a soft soil foundation consolidation method for dredging and land reclamation formed by land reclamation. Background technique [0002] In large-scale sea reclamation projects, the traditional method is to fill the weak sea silt with a thickness of 3 to 8 meters and a permeability coefficient greater than 10. -5 cm / s of sandy soil. The large-area land area formed by dredging reclamation generally has high water content, high groundwater table, and low bearing capacity, and is inaccessible to man and machine. In order to meet the requirements of industrial buildings, it is necessary to strengthen the soft soil foundation for the land area filled by dredging. The existing common methods for consolidation and improvement of large-area soft soil foundation include high vacuum compaction method, vacuum preloading method, surcharge preloading method, etc. ...

Claims

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Application Information

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IPC IPC(8): E02D3/02E02D3/10E02D3/046
Inventor 徐士龙徐望
Owner SHANGHAI HARBOUR SOFT SOIL TREATMENT ENG CO LTD
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