Foundation treatment method adopting water penetration pile in combination with vacuum preloading

A technology of foundation treatment and permeable piles, which is applied in infrastructure engineering, construction, soil protection, etc., can solve problems such as high cost of long-distance transportation of stockpiled materials, easy blockage of plastic drainage boards, difficulty in controlling construction quality, etc., and speed up construction. Consolidation and settlement of soil, accelerated consolidation speed, high stiffness and strength

Active Publication Date: 2014-03-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, there have been a large number of weak foundation projects. The plastic drainage board-vacuum preloading method is generally used for foundation treatment, that is, the drainage board is inserted first and then the vacuum preloading is performed. Insufficient bearing capacity of the foundation after construc

Method used

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  • Foundation treatment method adopting water penetration pile in combination with vacuum preloading

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specific Embodiment approach

[0030] Step (1) Prepare the permeable pile 1. The pile body is a hollow pipe pile with a pile cap, which is permeable and breathable; the strength of the pile body is 15MPa-30MPa, and the permeability coefficient is 0.01mm / s-5.4mm / s. The diameter is 350-600 mm, the thickness of the pile wall is 100-200 mm, and the length of the pile body is 10 m-20 m.

[0031] Step (2) Divide the treatment area of ​​the foundation into blocks, each block is divided by 3×104 m2 to 4×104 m2, and 6 to 8 adjacent single blocks form a block, and each block is constructed simultaneously during vacuum preloading, and each block Pipeline operation is carried out in between.

[0032] Step (3) Drive the prefabricated permeable piles into the foundation of the pre-compression area with a spacing of 1.2-1.5 m. The pile caps are not covered first, but covered with geotextiles. The sand cushion is fully paved in the pre-pressing area, with a thickness of 50 cm to 80 cm, mainly medium-coarse sand (mud conte...

specific example 1

[0038] A port soft foundation treatment project requires land reclamation to expand the port area, and build a container yard after the foundation bearing capacity meets the requirements. The land reclamation project was built by dredging on the original basis of the coast. The geological conditions from top to bottom are plain fill, dredger fill, sand with silt, silty clay with gravel, and argillaceous sandstone. The layer is thicker, resulting in a wide range of soft foundation treatment and great difficulty, making it difficult to control the overall investment. Therefore, in order to shorten the construction period and reduce the post-construction settlement, permeable piles combined with vacuum preloading can be used to treat the marine soft soil foundation.

[0039] The permeable piles are arranged with tubular piles, the length of which is 10 m to 20 m, the compressive strength of the piles is not less than 15MPa, and the permeability coefficient is not less than 0.01mm...

specific example 2

[0044] For a coastal road project, the foundation is composed of crushed rock fill and dredged silt on the upper layer (land reclamation half a year ago) and the lower layer of silt-containing sand and argillaceous shale weathering products. It is a typical weak foundation. The water content of the foundation is Large, high compressibility, low strength, poor permeability, and inhomogeneity, so permeable piles combined with vacuum preloading can be used to treat the foundation.

[0045] The permeable piles are arranged with tubular piles, the length of which is 10 m to 20 m, the compressive strength of the piles is not less than 15MPa, and the permeability coefficient is not less than 0.01mm / s. Divide the foundation reinforcement area, each block is divided into 3×10 4 m 2 ~4×10 4 m 2 Carry out division, and form an area with 6 to 8 adjacent single blocks. The pile body is pressed into the foundation by a pile driver, and the sand cushion is fully paved in the pre-pressed...

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Abstract

The invention discloses a foundation treatment method adopting a water penetration pile in combination with vacuum preloading. The foundation treatment method comprises the following steps: (1) fabricating the water penetration pile, wherein a pile body of the water penetration pile is a hollow tubular pile and provided with a pile cap; (2) blocking a treatment area of a foundation, forming a zone with a plurality of adjacent single blocks, carrying out synchronous construction on all the blocks during vacuum preloading, and carrying out a flow process between the zones; (3) driving the prefabricated water penetration pile in the foundation in a preloading zone, and fully spreading a sand cushion in a preloading area; (4) laying a vacuum pipe network; (5) paving a sealing film on the surface of the flattened sand cushion for a plurality of times; (6) digging out a seal trench in the periphery of an reinforcement zone, and vertically inserting the edge of the sealing film into weak soil along the inner wall of the seal trench and paving the film at the bottom of the trench flatly; and (7) carrying out vacuumizing and tightening the pile cap. As the water penetration pile is high in rigidity and strength, and good in water penetration performance, the pore water pressure and the settlement respectively accumulated in the foundation treatment process are low, and correspondingly, the post-construction settlement of the foundation is reduced; the bearing strength of the foundation is also improved.

Description

[0001] technical field [0002] The invention provides a method for treating foundations by using permeable piles combined with vacuum preloading, which belongs to the field of civil engineering. Background technique [0003] In recent years, there have been a large number of weak foundation projects. The plastic drainage board-vacuum preloading method is generally used for foundation treatment, that is, the drainage board is inserted first and then the vacuum preloading is performed. Insufficient bearing capacity of the foundation after construction, etc.; or use the plastic drainage board-heap preloading method to deal with it, that is, insert the drainage board first and then carry out the heap preloading. However, this method has difficulties in controlling the construction quality and long-distance transportation. High material cost, long project cycle and other issues. Contents of the invention [0004] In order to solve the shortcomings of the existing technology, ...

Claims

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Application Information

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IPC IPC(8): E02D3/10
Inventor 崔新壮汤潍泽张炯娄俊杰张娜隋伟
Owner SHANDONG UNIV
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