Bidirectional vacuum prepressing blowing filling soft soil foundation treatment method

A soft soil foundation and treatment method technology, applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of long drainage path and poor drainage effect, and achieve the goal of increasing reinforcement depth, increasing transmission depth, and saving materials Effect

Inactive Publication Date: 2008-08-06
NANJING UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

However, the drainage path of this method is too long, and the drainage effect is poor in the viscous dredging fill with low permeability coefficient.

Method used

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  • Bidirectional vacuum prepressing blowing filling soft soil foundation treatment method

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Embodiment Construction

[0017] In conjunction with the accompanying drawings, the two-way vacuum preloading blow-fill soft soil foundation treatment method of the present invention, the steps are as follows:

[0018] Before the filling starts, in conjunction with the construction of the cofferdam 1, a sealing wall 7 is built near the cofferdam 1 such as the lower soil layer, and a vacuum pipe 9 is pre-buried at the bottom of the cofferdam 1 .

[0019] After the construction of the cofferdam 1 is completed, the accumulated water in the cofferdam 1 is drained, and a layer of sand cushion 5 is laid. The vacuum pipe 9 at the bottom is connected, and finally a layer of geotextile is laid on the sand cushion 5 .

[0020] On the sand cushion 5 and the geotextile, the plastic drainage board (3) is set up in the lower soft soil 6 according to the horizontal spacing, and a section of the drainage board 3 exposed on the ground surface is vertically tied upwards on the moso bamboo frame, and the exposed height i...

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Abstract

The invention discloses a bidirectional vacuum pre-pressing hydraulically-filled soft ground treatment process, which comprises the following steps that building sealing walls and embedding vacuum pipes on the bottom of a coffer-dam, paving sand cushion with appropriate thickness whose inner portion is provided with filter strainers and vacuum tubes, and the surface is covered with earth-work cloth, building plastic drainage plates whose one section which is exposed on the surface of earth is vertically tied on a bamboo frame upwards, hydraulically filling sands to height mark, installing vacuum-pumping devices, and paving vacuum films. And the process is finished after the design consolidation degree is reached on the earth through starting the vacuum-pumping pump. The process increases the reinforcing treatment depth of vacuum pre-pressing, shortens the construction cycle of hydraulically-filled earth-building project, and saves vacuum film material.

Description

technical field [0001] The invention belongs to the foundation treatment technology of dredging fill soil and its underlying soft soil strata in dredging fill land reclamation engineering, in particular to a two-way vacuum preloading blow fill soft ground treatment method. Background technique [0002] The dredged soft soil foundation is a special foundation composed of dredged fill soil and its underlying soft soil strata produced by cofferdam dredging and filling. It is widely distributed in the newly built coastal land in my country. It generally has low bearing capacity, high water content, The soft soil is characterized by deep and deep layers, so it must be used after foundation treatment. At present, methods such as vacuum preloading, surcharge preloading, and dynamic drainage consolidation are generally used for reinforcement. [0003] The vacuum preloading method is to lay an appropriate thickness of sand cushion on the surface of the soft foundation that needs to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/10E02D19/18
Inventor 丁勇范进章杨松丁建国左晓宝孙耀南
Owner NANJING UNIV OF SCI & TECH
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