Compound reinforcing method capable of rapidly falling-silt, promoting-seepage, prepressing, reinforcing and blow filling soft clay

A soft clay and fast technology, applied in soil protection, construction, infrastructure engineering, etc., can solve the problems of long treatment period of soft soil foundation, long distance of sand and gravel, and tight construction land, so as to shorten the construction period. , The effect of reducing engineering cost and reducing surface tension

Inactive Publication Date: 2010-03-31
要明伦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the construction land is in short supply, and the transportation distance of sand and gravel materials is long. On the other hand, the treatment period of weak soil foundation is too long. Region has become a bottleneck restricting economic development

Method used

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  • Compound reinforcing method capable of rapidly falling-silt, promoting-seepage, prepressing, reinforcing and blow filling soft clay

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In the laboratory, the improved small-scale specific resistance tester was used to carry out the suction filtration test, and the mud of Ningbo Dongqian Lake was used to prepare 300% (solid content accounted for 25%) concentration mud, and the coagulant was polyaluminum chloride (PAC), polypropylene Amide (PAM), PM, 5#, mannitol, chitosan, ferric chloride, alum, polyferric chloride and additives cement and lime. The test vacuum degree of the specific resistance tester is set at 40-80KPA, and the suction filtration time is 0.5-24 hours, and the effect is considered by the water output. The test results prove that PAC, PAM and cement additives have a more significant effect of water release after flocculation, and the strength of the soil is the highest with the addition of cement.

Embodiment 2

[0032] In the laboratory, the suction filtration test was carried out using an improved small specific resistance tester.

[0033] Take Ningbo Dongqian Lake sludge to prepare 300% (solid content accounts for 25%) concentration mud. The dosage is 50-300PPM, the dosage of PAC is 500-2000PPM, the test vacuum of the specific resistance tester is set to 80KPA, and the suction filtration time is 24 hours. The effect of PAM is considered by the water output after water and soil separation. The test results prove that amphoteric PAM is the most effective for mud drainage, followed by cationic, anionic and nonionic.

[0034] Take Tianjin Dagang silt to prepare mud with a concentration of 300% (solid content accounts for 25%). The coagulants are PAC and PAM. The amount of PAM added to the mud is 20-200PPM, and the amount of PAC added is 200-1000PPM. The test vacuum degree of the instrument is set to 80KPA, and the suction filtration time is 24 hours. The effect of PAM is considered by ...

Embodiment 3

[0037] Take Dalian silt to prepare 300-900% (solid content accounts for about 10-25%) concentration mud, the dilution water is tap water and salted (salt) tap water, and salted tap water is used to simulate seawater, and the coagulant is PAC and PAM, PAM The mixing amount in the mud is 20-500PPM, and the mixing amount of PAC is 0-3000PPM. Tap water with salt and tap water without salt are used as dilution water. The former can significantly reduce the dosage of water-soil separation agent.

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Abstract

The invention relates to a compound reinforcing method capable of rapidly falling-silt, promoting-seepage, prepressing, reinforcing and blow filling soft clay. The method comprises the following steps: mixing water and soil separating agent and sucking silt mud, introducing the mud mixed with the water and soil separating agent into a cofferdam for silt falling, appearing obvious and rapid solid-liquid separation of the mud in the cofferdam, and overflowing and discharging or recycling the separated tail water containing extremely few of solid matters from the far end of the cofferdam; after filling, silt falling and discharging, respectively inserting a plastic drainage plate, laying a plastic drainage pipe, geotextile and a plastic film on the surface layer of the silt, utilizing a vacuum pump to suck to form negative pressure at the lower part of the plastic film, discharging water in silt body on the surface layer by means of atmosphere pressure to lead the bearing capacity of siltbody on the surface layer to be improved rapidly, establishing an operation platform for follow-up soft base treatment, such as vacuum preloading, pile deep stirring, electroosmosis and plate body stabilizing and other technologies, thus realizing the filling-silt overall soft foundation consolidation treatment purpose in the cofferdam. The technology of the invention reduces the construction time of filling soft soil foundation to half and the cost to a half, is popularized and applied, and has extremely economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of soft clay treatment such as silt, and in particular relates to a technology for large-scale dredging and filling of silt to make land. Background technique [0002] Modern marine and river sediments are widely distributed along the coast, along the river, in estuary deltas, lake areas and mountain valleys in my country. The thickness of the alluvial layer is several meters to tens of meters. The annual dredging volume in ports, inland rivers and inland lakes reaches several These sediments are mainly soft clay such as silt and silty soil, silt and fine sand, and contain a small amount of organic matter. It is a renewable resource to be used as soil, and it will cause serious pollution to the environment as litter. These weak soil layers also have the characteristics of high water content, high compressibility, low permeability, and poor bearing capacity. Building structures on it will encounter problems su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/00E02D3/10
Inventor 孙建国刘曰键要明伦王展国梁力民
Owner 要明伦
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