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Interception and drainage power consolidation soft foundation treatment method

A dynamic consolidation, soft foundation technology, applied in infrastructure engineering, soil protection, construction, etc., can solve problems such as ineffective precipitation and dissipation of pore water pressure, difficulty in meeting control requirements for groundwater levels, and reduce risks and costs. , controllable cost and quality, environmental protection and short construction period

Inactive Publication Date: 2012-09-26
汪文彬
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Problems solved by technology

[0005] The foundation treatment method of light well points combined with dynamic compaction can avoid the phenomenon of "rubber soil" to a certain extent, but in actual engineering results, light well point precipitation can only be used to lower the groundwater table, and for sites with abundant groundwater, the permeability coefficient For larger soil layers, the groundwater level is difficult to meet the control requirements; and for soft soils with a permeability coefficient less than 10-5cm / s, light well points combined with dynamic compaction have little effect on dewatering and dissipating pore water pressure

Method used

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  • Interception and drainage power consolidation soft foundation treatment method
  • Interception and drainage power consolidation soft foundation treatment method
  • Interception and drainage power consolidation soft foundation treatment method

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example 1

[0029] The storage yard project in an exhibition area has a processing area of ​​about 100,000 square meters. The soil layer: the first layer of plain fill: mainly clayey soil, with a thickness of about 0.6-4.6m, and the top is cultivated soil with a thickness of about 20cm. Composed of crushed stones, bricks and a small amount of cohesive soil; the second layer is brown-yellow to gray-yellow silty clay, with a thickness of about 0.5-2.7m, containing iron oxide spots and ferromanganese concretions, with powdery soil lumps, and the soil quality is composed of Gradually soften from top to bottom. The third layer is grayish-yellow to gray silt, with a thickness of about 1.30-4.80m, containing mica and organic matter, with a small amount of silty soil, and the permeability coefficient is 10-4cm / s; the fourth layer is muddy silty clay, with a thickness of About 8.20-14.30m, it is in flow-plastic state, has high compressibility, contains organic matter, sandwiches thin layer of silt...

example 2

[0047] A road project with a total length of 2.1km and a width of 60m, the main road in the development zone, with a processing area of ​​about 120,000m 2 , Soil layer conditions: the first layer is miscellaneous fill: mainly weathered sand, gravel and cohesive soil, with an average thickness of 1.7m; the second layer is silty clay: soft plastic, with an average thickness of 1.5m; the third layer It is silty silty sand: flow plastic, permeability coefficient is 1.0*10-4cm / s, layer thickness is about 4m; the fourth layer is silty clay: permeability coefficient is 1.0*10-6cm / s, layer thickness is about 6m; the fifth layer is a coarse gravel layer: the thickness of the layer is about 10m, and the permeability coefficient is 1.0*10-2cm / s.

[0048] In this project, according to the road design requirements, the bearing capacity after foundation treatment is 120kPa, and the post-construction settlement is less than 30cm. It is required to form a hard shell with a thickness of about ...

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Abstract

The invention relates to an'interception and drainage power consolidation' soft foundation treatment method which reduces the groundwater level and water content of a soil body of a treatment field and improves the density and physical mechanics index of the soil body by organically combining interception, strong drainage and vibration rolling or dynamic compaction. The interception is realized in a way that an interception curtain is arranged at the periphery of the treatment area, and water is supplied inside and outside a separation area; the strong drainage is realized in a way that a certain number of strong vacuum wells or other strong drainage systems are arranged in the treatment field so that the groundwater level and the water content of the soil body are in the optimal range; and the power consolidation is realized in a way that when the groundwater level and the water content of the soil body are optimal, the soil body is beaten by vibration rolling or dynamic compaction so as to achieve certain density and improve the physical mechanics index of the soil body in the treatment area. According to the invention, the groundwater level is always kept in the control range in the power consolidation construction process, and the water content of the soft soil is kept optimal; and the method provided by the invention has the characteristics of short construction period, low manufacturing cost, simple technology, high quality, no pollution and the like.

Description

technical field [0001] The invention relates to a method for treating soft ground, which can be applied to large-area loading areas, soft ground formed near land areas, road subgrades, airports, ports and wharfs, and other projects. Background technique [0002] Soft soil foundation treatment has become a particularly complicated problem in engineering due to the complex geological conditions, poor permeability, high water content, and poor structure of soft soil. [0003] The following methods are currently commonly used for the treatment of soft ground in newly-reclaimed land areas, poor surface bearing capacity, deep and thick soft layers under the site, and large-area loads: 1. Composite ground treatment methods: cement mixing piles, CFG Pile, dynamic compaction replacement, gravel pile, concrete pile, etc.; 2. Drainage consolidation method: vacuum preloading, surcharge preloading, high vacuum compaction, etc.; 3. Dynamic compaction method, etc. [0004] The dynamic com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/10E02D19/18
Inventor 汪文彬
Owner 汪文彬
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