Deep soft foundation reinforcement treatment method

A technology of soft foundation reinforcement and treatment method, which is applied in infrastructure engineering, soil protection, construction, etc., and can solve problems such as difficult construction, high filler, and insufficient surface stiffness

Inactive Publication Date: 2016-01-06
CCCC FOURTH HARBOR ENG INST +4
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Problems solved by technology

[0003] The traditional preloading methods (vacuum preloading, surcharge preloading and vacuum-surcharge combined preloading) are difficult to complete the consolidation of deep and thick silt in a short period of time due to the defects of insufficient surface rigidity, high filler, and long construction period. Cannot meet the needs of rapid con

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  • Deep soft foundation reinforcement treatment method

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[0029] Such as figure 1 As shown, it is a schematic cross-sectional view of the reinforcement treatment method of vacuum surcharge preloading combined with dynamic compaction for deep and thick soft foundations of the present invention. The specific implementation steps of the method are as follows:

[0030] (1) Clean up and level the ground in the area to be reinforced.

[0031] (2) Fill a sand cushion layer 1 not less than 0.4m thick. The sand cushion layer is made of fine sand, medium sand or coarse sand, and the mud content is not more than 5%.

[0032] (3) Insert the vertical drainage body 2, and the vertical drainage body can be selected from plastic drainage boards, or sand wells or bagged sand wells.

[0033] (4) Dig sealing trenches 3 around the area to be reinforced. When there is a permeable sand layer within the treatment depth range of the area to be reinforced, set up double rows of mud stirring piles 4 around the area to be reinforced.

[0034] (5) Lay the vac...

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Abstract

The invention provides a deep soft foundation reinforcement treatment method. The deep soft foundation reinforcement treatment method comprises the following steps: leveling the site of a region to be reinforced; filling a sand bed; inserting a vertical drainage body; digging sealing ditches; laying vacuum lines; mounting a vacuum unit, vacuumizing, laying geotextile on a film when the vacuum degree under the film reaches 80 kPa or above and is stable, and starting heaped loading construction; after the foundation in the region to be reinforced reaches the control consolidation degree (60-80 percent), relieving pressure step by step till stopping vacuumizing; after vacuum pre-pressing unloading, carrying out precipitation construction; performing dynamic compaction; and leveling the site to the construction level. The deep soft foundation reinforcement treatment method combines the functions of vacuum negative pressure, heaped loading positive pressure and dynamic load to form a static-dynamic consolidation compounded reinforcement technology. Compared with a traditional drainage consolidation method, the deep soft foundation reinforcement treatment method shortens 1/3 of the construction period and reduces 30 cm or above of post-construction settlement; and compared with a drainage consolidation + composite foundation secondary treatment method, the deep soft foundation reinforcement treatment method lowers the construction cost by 20-40 percent, is more remarkable in soft foundation reinforcement effect and is suitable for large-area application and popularization.

Description

technical field [0001] The invention relates to the technical field of foundation treatment for fixed buildings such as construction engineering, port engineering, and highway engineering, and in particular to the soft foundation treatment technology for bridgehead embankment sections of highway engineering. Background technique [0002] In recent years, my country's coastal and riverside areas have large-scale construction, and have high requirements for construction quality and construction period. However, the strata in such areas are generally buried with deep silt soft soils greater than 10m or even more than 30m. This type of soft soil has a high natural water content and a large void ratio. High compressibility, low permeability (10 -6 ~10 -8 cm / s), low shear strength and bearing capacity, and there are problems such as large settlement, long settlement duration and serious uneven settlement, which makes the foundation treatment more difficult. Especially for municip...

Claims

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Application Information

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IPC IPC(8): E02D3/10
Inventor 董志良陈伟东周琦杨福麟陈伟李榕波潘晓光邓伟袁坤
Owner CCCC FOURTH HARBOR ENG INST
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