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Underwater vacuum prepressing reinforcement soft base technique method

A vacuum and soft foundation technology, applied in infrastructure engineering, soil protection, construction, etc., can solve problems such as heavy workload, environmental pollution, and long construction period, and achieve short construction period, broad application prospects, and accelerated construction progress Effect

Active Publication Date: 2009-07-22
TIANJIN PORT ENG INST LTD OF CCCC FIRST HARBOR ENG +1
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Problems solved by technology

Due to the limitation of the wharf construction site, the only way to reduce the width of the wharf cap is the following method: first, backfill to form a land area, then use land foundation treatment technology to reinforce the foundation, and finally excavate to the The elevation required by the design, using this method for construction excavation and backfilling requires a lot of work, and the construction period is very long, and it is easy to cause environmental pollution to the seaside when backfilling. Cap width reduced from 90m to 70m

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  • Underwater vacuum prepressing reinforcement soft base technique method
  • Underwater vacuum prepressing reinforcement soft base technique method
  • Underwater vacuum prepressing reinforcement soft base technique method

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Embodiment Construction

[0096] (1) The innovation of underwater vacuum preloading technology after repeated tests and in-depth research

[0097] 1. Reinforcement mechanism of underwater vacuum preloading technology

[0098] Underwater vacuum preloading still belongs to drainage consolidation method in essence. The mechanism of the drainage consolidation method is to set up the drainage system, improve the drainage boundary conditions, shorten the drainage path, and accelerate the drainage. Under the action of the pressurized system, the pore water is discharged, the pore water pressure is reduced and converted into an increase in effective stress, and the soil is consolidated. , to eliminate most of the settlement and improve the compactness and strength, and after the load is unloaded, although there will be a slight rebound, most of the compression deformation is irreversible plastic deformation, and the soil is in an over-compacted state compared to before reinforcement, so that it can be Effecti...

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Abstract

A technical method for underwater vacuum preloading to strengthen soft foundations. The first underwater sand laying is carried out in the following steps, the plastic drainage board is laid on the water, the filter pipe is laid, the second underwater sand laying, the sealing film is laid, and the connection Vacuum equipment, vacuum. Its advantage is that the underwater vacuum preloading soft foundation technology can be applied to underwater excavation engineering, bank slope treatment engineering of high pile wharf, breakwater construction and other fields, and has broad application prospects. The preload is applied quickly, and the foundation will not be unstable or damaged. It is to strengthen the soft soil on the spot without cleaning, and does not use chemical substances such as curing agents. It meets the requirements of environmental protection and avoids the serious impact of the traditional filling method on the marine aquaculture industry. The use of this technology can reduce the amount of sludge. Cut and fill volume. Due to the rapid application of preload, the construction period can be greatly shortened.

Description

technical field [0001] The technology belongs to the underwater soft foundation treatment technology for civil engineering foundations and foundations, and in particular relates to an underwater vacuum preloading method for strengthening soft foundations. Background technique [0002] Soft soil foundations are distributed in European and American countries, Japan, Southeast Asia and my country, and are characterized by high water content, large void ratio, low strength, high compressibility, and low permeability. With the development of the national economy, many projects have to be built on soft soil foundations. In order to ensure the safety and normal use of buildings, unless deep foundations are used, the natural foundation must be reinforced. [0003] There are many methods for strengthening soft ground, but each method has a certain scope of application, and must be selected according to geological conditions, construction conditions, regional characteristics and use r...

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Application Information

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IPC IPC(8): E02D27/52E02D27/28E02D3/10
Inventor 张敬苗中海刘爱民郭述军徐树华叶国良李卫高潮陈允进孙万禾阎树旺刘润
Owner TIANJIN PORT ENG INST LTD OF CCCC FIRST HARBOR ENG
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