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Method for reinforcing composite vacuum prepressing soft soil foundation

A soft soil foundation and vacuum technology, which is applied in the field of soft soil foundation reinforcement and large-area deep soft soil foundation reinforcement. The effect of preloading time, increasing permeability coefficient, and increasing tamping energy

Inactive Publication Date: 2008-03-26
郁玫 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the vacuum preloaded foundation with plastic drainage boards inserted, after the drainage and exhaust channels are set, it is only suitable for the permeability coefficient ≥ 10 -5 cm / s site works, but has no effect on the consolidation of silt with a smaller permeability coefficient;
[0006] 2. Vacuum preloading needs to lay a 500mm sand cushion on the ground as a horizontal drainage layer, but in actual construction, it cannot be realized because mechanical equipment cannot enter the site on mud and other foundations;
[0007] 3. The bearing capacity of vacuum preloading is not high, it can only reach 80kPa, which cannot meet the requirements of larger bearing capacity sites;
[0008] 4. Due to the constraints of equipment and other factors, the time required for traditional vacuum preloading is very long, 3 months or more
[0009] The existence of the above shortcomings has limited the expansion and application of the vacuum preloading method in engineering.

Method used

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  • Method for reinforcing composite vacuum prepressing soft soil foundation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: Referring to Fig. 1, a composite vacuum preloading soft soil foundation reinforcement method, the method includes vacuum preloading dewatering and electroosmotic dewatering two parts, the construction steps are as follows:

[0041] a) Leveling the site and setting up a site drainage system; including a horizontal drainage system and a vertical drainage system, the horizontal drainage system is made up of drainage blind ditches, horizontal vacuum pipes 4 and sump wells, and the vertical drainage system is composed of plastic drainage boards and positive Negative electrode 2 composition.

[0042] Insert plastic drainage boards 1 on the site to be treated. The minimum distance between the plastic drainage boards is 1m×1m, and they are arranged in a plum blossom shape. High geotextiles ensure the smooth drainage of the vacuum system; insert positive and negative electrodes, which require good electrical conductivity, such as steel bars or aluminum rods or copp...

Embodiment 2

[0050] Embodiment 2: A kind of composite vacuum preloading soft ground reinforcement method, this method comprises vacuum preloading dewatering and electroosmotic dewatering two parts, and its construction steps are as follows:

[0051] a) Leveling the site and establishing a site drainage system; including a horizontal drainage system and a vertical drainage system. electrode composition.

[0052] Insert plastic drainage boards on the treated site, the minimum spacing of plastic drainage boards is 1m×1m, and they are arranged in a plum blossom shape. Plastic drainage boards must use high-performance plastic drainage boards to ensure the mechanical strength required for smooth vacuum. The filter membrane adopts high tensile strength. Geotextiles to ensure the smooth drainage of the vacuum system; insert positive and negative electrodes, which require good electrical conductivity, such as aluminum rods or copper rods, etc., and the depth and spacing are the same as plastic drai...

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Abstract

The composite vacuum pre-pressing soft foundation stabilizing process with vacuum pressing precipitation and electroosmosis precipitation includes the following steps: 1. establishing a site draining system, arranging a vacuum electroosmosis device, and setting a vacuum pressing sealing layer on the ground; 2. turning on the vacuum pump for vacuum pressing precipitation; 3. activating the circuit for vacuum electroosmosis precipitation; and 4. turning off the vacuum electroosmosis device and the vacuum pump after reaching the consolidation degree of 85 % and performing the post ground treatment and further stabilizing. The present invention combines vacuum pressing precipitation and electroosmosis precipitation to reach high consolidation degree of the soft foundation and shorten the construction period.

Description

technical field [0001] The invention relates to a foundation reinforcement method, in particular to a foundation reinforcement method for large-area deep soft soil, which is suitable for flowing mud, silt, and silty soil foundations, especially for soft soils with high bearing capacity but general deformation requirements. Soil foundation reinforcement. Background technique [0002] In construction projects, we often encounter some soft soil or soft soil layer with high water content. This kind of soil is characterized by high water content, high compressibility, low strength and poor water permeability. For this kind of foundation, especially for large areas Construction, such as building docks, airports, roads and houses on the foundation, requires treatment and reinforcement of the foundation. There are many methods for strengthening soft soil foundation, such as composite foundation, vacuum preloading method, vacuum electroosmotic dewatering method, etc. [0003] Vacuu...

Claims

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Application Information

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IPC IPC(8): E02D3/10E02D3/11
Inventor 朱怡郁玫
Owner 郁玫
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