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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 foundation reinforcement of large-area deep soft soil, and in the field of soft soil foundation reinforcement, can solve the problems of long vacuum preloading time, low vacuum preloading bearing capacity, and impracticability, etc. The effect of preloading time, increasing permeability coefficient, and increasing tamping energy

Inactive Publication Date: 2009-08-12
郁玫 +1
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  • 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

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Embodiment 1

[0040] Embodiment one: see figure 1 As shown, 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...

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 invention discloses a composite vacuum preloading soft soil foundation reinforcement method, which includes vacuum preloading dewatering and electroosmotic dewatering. Press the sealing layer; b) Turn on the vacuum pump to carry out vacuum pre-pressure dewatering; c) While performing step b) or when the water flow rate in step b) is reduced to less than 1 / 5 of the initial flow rate, turn on vacuum electroosmosis The circuit of the device; d) When the consolidation degree reaches ≥85%, turn off the vacuum electroosmosis device and the vacuum pump, and carry out post-processing and re-consolidation of the surface. The present invention retains the advantages of the original vacuum preloading by combining the two methods of vacuum preloading and electroosmotic dewatering, and at the same time combines electroosmotic dewatering to realize the vacuum preloading method on the silt (low permeability) soft soil foundation. It can be used, and the reinforcement depth of the soft soil layer can be increased, and the construction time can be shortened.

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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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/10E02D3/11
Inventor 朱怡郁玫
Owner 郁玫