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Improved quick high vacuum densification soft foundation treatment method

A high-vacuum, soft-foundation technology, applied in infrastructure engineering, soil protection, construction, etc., to achieve high drainage efficiency

Inactive Publication Date: 2012-12-19
SHANGHAI HARBOUR SOFT SOIL TREATMENT ENG CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]At present, there are problems in the high vacuum compaction method: first, the vacuum tubes are inserted on the surface of the soft ground, and the arrangement spacing of the vacuum tubes is limited by the requirement of the crawler’s travel width. Therefore, the number of pipes is limited, which affects the effect of the implementation of the high vacuum densification method
Second, due to the need to repeatedly pull out / insert the vacuum tube, when the operation of pulling out / inserting the vacuum tube is performed, the rammer will interrupt the "appropriate energy dynamic compaction" on the soft foundation, and the "supercharge" formed in the soft foundation before pulling out the tube each time Vacuum" environment is destroyed
Third, the vacuum tube is an independent structure, and the volume of the drainage channel formed by it is not large enough

Method used

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  • Improved quick high vacuum densification soft foundation treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 As shown, in a port yard project, the soil layer is muddy soil with a thickness of about 10-12 meters, a water content of 65%, and a permeability coefficient of 10. -4 cm / s.

[0031] Design requirements: the bearing capacity of the soft foundation 16 within 12 meters reaches 100KPa.

[0032] The specific implementation plan is as follows:

[0033] The first step is to insert several groups of plastic drainage boards 11 wrapped with geotextiles into the soft foundation 16, wherein the plastic drainage boards 11 are distributed in a rectangular shape, and the distance between the inserted plastic drainage boards 11 is 0.3 to 2 meters. The upper end of the drainage plate 11 is closed with a cover 12, and the cover 12 is provided with an interface, which is connected to one end of the conduit 14, and the other end of the conduit 14 is connected to the vacuum equipment 13 with the corresponding horizontal horizontal pipe 15, and the horizontal The horizo...

Embodiment 2

[0046] Such as figure 1 As shown, the geological condition of a seaside development zone is that the soil layer is silty soil with a thickness of about 10-15 meters, a water content of 70%, and a permeability coefficient of 1.5×10 -6 cm / s.

[0047] Design requirements: the bearing capacity of the soft foundation 16 within 15 meters reaches 120KPa.

[0048] The specific implementation plan is as follows:

[0049] The first step is to insert several groups of plastic drainage boards 11 wrapped with geotextiles into the soft foundation 16, wherein the plastic drainage boards 11 are distributed in a rectangular shape, and the distance between the inserted plastic drainage boards 11 is 2 to 4 meters. The upper end of the drainage board 11 is closed with a cover 12, and the cover 12 is provided with an interface, which is connected to one end of the conduit 14, and the other end of the conduit 14 is connected to the vacuum equipment 13 with the corresponding horizontal horizontal...

Embodiment 3

[0062] Such as figure 1 As shown, a soft foundation 16 along the river, the soil layer is silty soil, about 12-18 meters thick, with a water content of about 75% and a permeability coefficient of 10 -9 cm / s.

[0063] Design requirements: the bearing capacity of the soft foundation 16 within 18 meters reaches 140KPa.

[0064] The specific implementation plan is as follows:

[0065] In the first step, several groups of plastic drainage boards 11 wrapped with geotextiles are completely inserted into the soft foundation 16, wherein the plastic drainage boards 11 are distributed in a quincunx shape, and the distance between the inserted plastic drainage boards 11 is 3 to 5 meters. The upper end of the plastic drainage plate 11 is closed with a cover 12, and the cover 12 is provided with an interface, which is connected to one end of the conduit 14, and the other end of the conduit 14 is connected to the corresponding horizontal horizontal pipe 15 to the vacuuming device 13, the ...

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Abstract

The invention discloses an improved quick high vacuum densification soft foundation treatment method, belonging to the technical field of geotechnical engineering. The method comprises the following steps of: 1, inserting a plurality of groups of plastic draining plates wrapped with geotextile into a soft foundation to be treated, connecting the upper ends of the plastic draining plates to level horizontal pipes, and then connecting the horizontal pipes to vacuum pumping equipment, and embedding the level horizontal pipes into the surface soil of the soft foundation to be treated; and 2, starting the vacuum pumping equipment, and carrying out high-energy dynamic consolation in each direction of the surface layer of the soft foundation at a plurality of times, so as to keep the soft soil in a high vacuum state which is also a high pressure differential state together with the vacuum pumping construction. The method has low cost, short construction period, controllable quality and pure physical construction and is environment friendly and is capable of quickly consolidating the soft foundation.

Description

technical field [0001] The invention relates to a processing method in the technical field of geotechnical engineering, in particular to an improved rapid high-vacuum compaction soft foundation processing method. Background technique [0002] With the reduction of available land in cities and the enhancement of people's awareness of environmental protection, people have increased land reclamation projects along the coast, rivers, and rivers in recent years. The newly formed land soil usually has high water content, high compressibility, and permeability It is a weak soil and must be treated to meet the requirements of use. As far as the current shortage of land resources is concerned, such projects will increase in large numbers in the future, so soft ground treatment has broad application prospects. [0003] There are a large number of soft foundations along the river, coast and lake. Soft foundations generally have high water content, poor permeability, low bearing capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/10E02D3/046
Inventor 徐士龙徐望
Owner SHANGHAI HARBOUR SOFT SOIL TREATMENT ENG CO LTD
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