Low-water-level precipitation vacuum and surcharge united preloading reinforcement deep soft foundation method and system

A combined stacking and vacuum technology, applied in basic structure engineering, soil protection, construction, etc., can solve the problems of poor reinforcement effect of deep soft soil, insufficient reinforcement depth, and high stacking cost, so as to shorten the consolidation time and speed up the process. Pumping speed, the effect of reducing the vacuum preloading cycle

Inactive Publication Date: 2020-08-14
SOUTHEAST UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is technically reasonable and can solve the problems of insufficient reinforcement depth, poor deep soft soil reinforcement effect, insufficient surcharge material, high surcharge cost, and long construction period in the traditional vacuum-combined surcharge scheme.

Method used

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  • Low-water-level precipitation vacuum and surcharge united preloading reinforcement deep soft foundation method and system
  • Low-water-level precipitation vacuum and surcharge united preloading reinforcement deep soft foundation method and system
  • Low-water-level precipitation vacuum and surcharge united preloading reinforcement deep soft foundation method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. The plastic drainage board is of SPB-B type, with a thickness of 4mm, a width of 100mm, and a permeability coefficient of 5*10-3cm3 / s. It is laid on a soft soil foundation for 25m; Wrapped with filter cloth, the lower end of the tube is equipped with a filter screen with a hole diameter of 300mm and a depth of 15m. Arrange the plastic drainage boards in a square with an interval of 1m, and arrange a dewatering well in the center of the square. Arranged as Figure 4 ;

[0040] 2. Leave an area of ​​8*8m on the soft soil foundation 2 In the water drawing area, sand cushions are laid out on the soft ground and technical areas respectively, and drainage pipes are laid out in the sealing membrane. Connect the drain hose to the vacuum pump.

[0041] 3. Through the vacuum preloading method, the deep soft soil foundation will be constructed for one month, and part of the water in the soft soil foundation will be drained. At this time, the vacuum preloading drainage effec...

Embodiment 2

[0048] 1. The plastic drainage board is of SPB-B type, with a thickness of 4mm, a width of 100mm, and a permeability coefficient of 5*10 -3 cm 3 / s, 20m laid on the soft soil foundation; the dewatering well is made of steel pipe, the pipe wall is covered with leak holes, the surface is wrapped with filter cloth, and the lower end of the pipe is equipped with a filter screen with a hole diameter of 300mm and a depth of 10m. Arrange plastic drainage boards in a square with a spacing of 0.8m, and arrange a dewatering well in the center of the square;

[0049] 2. Leave an area of ​​6*6m on the soft soil foundation 2 In the water drawing area, sand cushions are laid out on the soft ground and technical areas respectively, and drainage pipes are laid out in the sealing membrane. Connect the drain hose to the vacuum pump. Lay a sealing film on the sand cushion;

[0050] 3. Through the vacuum preloading method, the deep soft soil foundation will be constructed for two months to dr...

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Abstract

The invention discloses a low-water-level inverted siphon precipitation vacuum and surcharge united preloading reinforcement deep soft foundation system. The low-water-level inverted siphon precipitation vacuum and surcharge united preloading reinforcement deep soft foundation system comprises a soft soil foundation, a surcharge, plastic drainage boards, water absorption pipelines, precipitation wells, a filter cloth, a sand bed, a sealing film, a vacuum pump, a water drawing pit, a water drawing box and a centrifugal pump. According to the low-water-level inverted siphon precipitation, vacuumand surcharge united preloading reinforcement deep soft foundation system disclosed by the invention, a low-water-level inverted siphon precipitation vacuum and surcharge united preloading reinforcement deep soft foundation method is adopted, a low-water-level design idea of the vacuum water drawing box is provided, an idea of inverted siphon is combined to enable the zero point of the water level of the system to move downwards, so that the underground water level of the reinforcement site is effectively reduced; the inverted siphon effect is formed between the precipitation wells and the water drawing box, so that the underground water level of the site is reduced by the system, and vacuum pressure of lied soft soil can also be substantially increased; the ground stabilization to the deep soft soil is greatly improved by the processing method, duration can be shortened, and construction maintenance cost is reduced; and the method is simple in technology, and convenient to implement,and can be used for practical engineering.

Description

technical field [0001] The invention relates to a method and system for strengthening deep and thick soft foundations with low-level precipitation vacuum combined with surcharge preloading, and belongs to the new technical field of foundation reinforcement. Background technique [0002] With the construction and development of national marine projects, the land for infrastructure construction in coastal cities is increasingly scarce, so there are more and more projects such as port construction and tidal flat construction. Dredging fill soil formed by channel dredging is often used as soft foundation soil. The soft soil involved in this type of project has the characteristics of high water content, deep soft soil foundation, and high compressibility. During the construction process, the vacuum preloading combined with stacking technology can reduce the transportation of large-scale piled earthwork, reduce the burden of raw materials for piled piles, the burden of finding so...

Claims

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Application Information

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IPC IPC(8): E02D3/10E02D19/10
CPCE02D3/10E02D19/10
Inventor 朱向阳邓永锋胡永涛卢友兵徐琛琛韩时捷阮春生
Owner SOUTHEAST UNIV
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