A rapid preloading drainage consolidation system for soft soil foundation and a preloading drainage consolidation method

A technology for drainage consolidation and soft soil foundation, which is applied in infrastructure engineering, soil protection, construction, etc., and can solve the problems of original structure damage of saturated soft soil, long radial drainage consolidation time, and difficulty in dissipating pore water pressure. , to achieve the effect of low input cost, good drainage and consolidation effect, and convenient realization

Inactive Publication Date: 2015-10-28
李晓军
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the actual construction process, the existing preloading drainage consolidation method has the following problems: the stress in the soil generated by the vertical pressure on the surface has a small effect on the horizontal consolidation of the soil, resulting in horizontal radial drainage consolidation. It takes a long time, and it takes a long time to meet the project requirements, which not only affects the construction period, but also affects the project cost
Therefore, if the existing preloading drainage consolidation method is to be used to strengthen the foundation in a short time, the ground load must be increased, and the increase of the ground load will not fundamentally change the horizontal radial seepage consolidation speed in the foundation, but will make the foundation The stress generated by the soil under the action of heavy load severely damages the original structure of the saturated soft soil, resulting in a significant decrease in its permeability, making it difficult for the pore water pressure to dissipate and remain high, resulting in the failure of foundation reinforcement
Therefore, the existing preloading drainage consolidation method takes a long time to strengthen the soft soil foundation. The main reason is that the horizontal radial consolidation cannot be solved, and the required consolidation time is relatively long, generally 18 to 30 months , the combination of vacuum and surcharge preloading can only shorten the consolidation time to about 15 months
However, for unfavorable soils such as saturated soft soil with large void ratio, high water content, low permeability and low strength, when the existing drainage consolidation method is used for consolidation, a longer loading and consolidation time is required, generally 1 to 3 years

Method used

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  • A rapid preloading drainage consolidation system for soft soil foundation and a preloading drainage consolidation method
  • A rapid preloading drainage consolidation system for soft soil foundation and a preloading drainage consolidation method
  • A rapid preloading drainage consolidation system for soft soil foundation and a preloading drainage consolidation method

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Effect test

Embodiment 1

[0064] like figure 1 , figure 2 A quick preload drainage consolidation system for soft soil foundation shown, including a plurality of radial hydraulic pressurization devices 3 arranged in the foundation to be reinforced, and a grouting system used in conjunction with a plurality of said radial pressurization devices The system, the vertical drainage device arranged in the foundation to be reinforced and the horizontal drainage device arranged on the surface of the foundation to be reinforced, the horizontal drainage device communicates with the inside of the vertical drainage device. The radial hydraulic pressure device 3 includes a hard straight pipe 3-1 that is sealed at the bottom and inserted vertically into the foundation to be reinforced. The part of the hard straight pipe 3-1 inserted into the foundation is an insertion The foundation segment, the insertion foundation segment is a screen tube with a plurality of through holes on the side wall, and the outer side of t...

Embodiment 2

[0109] like Figure 4 As shown, in this embodiment, the soft soil foundation rapid preloading drainage consolidation system adopted is different from that in Embodiment 1 in that: the lateral hydraulic limiting device 1 is a combined limiting device 2 . The combined limiting device-2 is formed by continuous assembly of a plurality of limiting units arranged on the same straight line; the limiting unit-including a hard lath inserted vertically into the foundation to be reinforced-2 -1, the inner side of the hard lath 2-1 is sealed with a layer of elastic sealing film 2-2, and a seal is formed between the hard lath 2-1 and the elastic sealing film 2-2 The second grouting cavity; the sealed grouting cavity two is connected to the grouting equipment 12 through the second liquid injection pipeline.

[0110] During actual construction, the hard lath 2-1 is a straight board, an arc-shaped board or a corrugated board, and the cross-sectional shape of the corrugated board is a sinusoi...

Embodiment 3

[0122] like Figure 5 As shown, in this embodiment, the soft ground rapid preloading drainage consolidation system adopted is different from that of Embodiment 2 in that: the combined limiting device 2 is adjacent to one of the two limiting units 1. A sand well 16 is arranged between them.

[0123] During actual construction, the sand well 16 is used as the vertical drainage device for vertical drainage.

[0124] In this embodiment, the structures and connections of other parts of the rapid preloading drainage consolidation system for the soft soil foundation adopted are the same as those in Embodiment 2.

[0125] In this embodiment, the soft soil foundation rapid preload drainage consolidation method adopted is different from Embodiment 2 in that: while constructing a plurality of radial hydraulic pressure devices 3 in step 1, it is also necessary to The sand well 16 between the front and rear adjacent two limiting units 1 in the combined limiting device 1 is constructed. ...

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Abstract

The invention discloses a quick prepressing drainage consolidation system and a prepressing drainage consolidation method for a soft soil foundation. The prepressing drainage consolidation system comprises a plurality of radial hydraulic pressurization devices arranged in the foundation to be consolidated, a grunting system matched with a plurality of radial pressurization devices, and a vertical water drainage device and a horizontal water drainage device which are arranged in the foundation to be consolidated, wherein each radial hydraulic pressurization device comprises a hard straight pipe driven into the foundation to be consolidated; the part of each hard straight pipe is called an insertion foundation section; a plurality of through holes are formed in the side wall of each insertion foundation section, and an elastic sealing film III covers each insertion foundation section. The prepressing drainage consolidation method for the soft soil foundation comprises the following steps of: 1, construction of the radial hydraulic pressurization devices; 2, construction of the vertical water drainage device and the horizontal water drainage device; and 3, radial pressurization for water drainage and consolidation. The quick prepressing drainage consolidation system is rational in design, convenient to construct, low in investment cost, good in using effect and high in practical value, and the prepressing drainage consolidation time is greatly shortened.

Description

technical field [0001] The invention belongs to the technical field of foundation preloading drainage consolidation, and in particular relates to a soft soil foundation rapid preloading drainage consolidation system and a preloading drainage consolidation method. Background technique [0002] Nowadays, when the soft soil foundation is strengthened, the preloading drainage consolidation method is usually used, and the preloading drainage consolidation method mainly includes the surcharge preloading method and the vacuum preloading method. In actual construction, both the surcharge preloading method and the vacuum preloading method need to lay out vertical drainage belts and horizontal drainage cushions. The most widely used surcharge preloading method is plastic drainage boards, and the horizontal drainage cushion is medium-coarse sand cushions. or pebble cushions. Among them, the consolidation principle of the vacuum preloading method is to reduce the pore water pressure in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/10
Inventor 李晓军李来宾
Owner 李晓军
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