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Construction technology for deep soft foundation treatment

A construction technology and soft foundation treatment technology, which is applied in the direction of foundation structure engineering, soil protection, sheet pile walls, etc., can solve the problems of difficult to meet the post-construction settlement and bearing capacity requirements of deep soft foundation areas, high engineering cost, etc., to achieve Solve the problem of foundation bearing capacity, increase the bearing capacity of single pile and composite foundation, and improve the effect of strength

Inactive Publication Date: 2017-05-17
厦门中平公路勘察设计院有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0002] At present, rigid piles such as CFG piles or pipe piles are mainly used for the deep soft foundation treatment of high-grade roads in bridge head subgrades, retaining walls and other structures. It is difficult to meet the post-construction settlement and bearing capacity requirements of the deep soft foundation area. Therefore, how to combine the actual situation of the project and adopt a more economical reinforcement method of drainage consolidation and cement mixing piles according to local conditions. In the deep soft foundation treatment of high-grade roads worthy of study

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  • Construction technology for deep soft foundation treatment
  • Construction technology for deep soft foundation treatment

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Embodiment 1

[0037] Such as figure 1 As shown, the present invention discloses a construction process for treating deep and thick soft foundations, which is characterized in that the construction process uses plastic drainage boards 3 for deep pretreatment, and then uses cement mixing piles 4 for secondary shallow reinforcement treatment. Specifically includes the following steps:

[0038] Calculation of ground treatment parameters:

[0039] In this process, the upper silt is reinforced with cement mixing pile 4, and the settlement control of deep silt is treated with plastic drainage board 3. The calculation model is divided into the upper soft soil layer using the composite foundation reinforcement area, and the lower soft soil layer as the drainage preloading treatment area. The foundation bearing capacity and settlement of different reinforced soil layers are calculated as follows:

[0040] Settlement Calculation:

[0041] The settlement of the foundation is based on the settlement ...

Embodiment 2

[0059] This embodiment is based on the construction process steps described in Embodiment 1, and takes the Gangbei Road (west section) project in Xiamen City as the construction object for implementation verification.

[0060] The road is an urban main road with a total length of 1.445km. The original landform unit of the road section is the bay tidal flat. There are generally deep soft foundations over 12m in depth, and the deepest silt is about 20m. The original design uses CFG piles to deal with the deep penetration of silt. , the plane layout adopts an equilateral triangle layout, the spacing is 1.4m, the average treatment depth is about 18m, and the average cost per square meter is about 630 yuan. After adopting the process of the present invention, the plastic drainage board 3 has an average treatment depth of 18m, and the plane layout adopts a spacing of 1.2m and an equilateral triangle arrangement. The cement mixing pile 4 carries out secondary treatment depth of 10m, a...

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Abstract

The invention relates to the field of building construction, and discloses a construction technology for deep soft foundation treatment. Deep layer pretreatment is carried out through plastic drainage plates, then secondary shallow layer consolidation treatment is carried out by adopting cement stirring piles, the problems of post-construction settlement and foundation bearing capacity are effectively solved, the engineering cost of deep composite foundations is reduced, particularly, the technology has great economic benefits for the foundations with the soft foundation depth being 20m or above, and meanwhile, the preloading time of drainage preloading consolidation is shortened; and through the construction technology reasonably designed, the strength of the soil between the piles is improved through the plastic drainage plates, so that the strength of pile bodies of the cement stirring piles is greatly improved, and the bearing capacity of one single pile and the composite foundations is improved by about 10% compared with that of a conventional cement stirring pile.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a construction technique for treating deep and thick soft foundations. Background technique [0002] At present, rigid piles such as CFG piles or pipe piles are mainly used for the deep soft foundation treatment of high-grade roads in bridge head subgrades, retaining walls and other structures. It is difficult to meet the post-construction settlement and bearing capacity requirements of the deep soft foundation area. Therefore, how to combine the actual situation of the project and adopt a more economical reinforcement method of drainage consolidation and cement mixing piles according to local conditions. In the deep soft foundation treatment of high-grade roads worthy of study. Contents of the invention [0003] The purpose of the present invention is to provide a construction process for deep soft foundation treatment, which has greater economic benefits for soft foundat...

Claims

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Application Information

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IPC IPC(8): E02D3/10E02D5/46
CPCE02D3/10E02D5/46
Inventor 张华胡献文陈春珍林平孙明义沈晓文
Owner 厦门中平公路勘察设计院有限公司
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