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Binary Composite Foundation of Discrete Pile-Permeable Concrete Pile and Its Treatment Method

A technology of concrete piles and binary composites, applied in sheet pile walls, soil protection, foundation structure engineering, etc., can solve problems such as unsuitable for deep and thick liquefied foundations, low stiffness and strength of bulk material piles, and small pile lengths

Active Publication Date: 2015-09-16
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] (2) Due to the low stiffness and strength of bulk material piles, the pile length is small, which is not suitable for earthquake resistance of deep and thick liquefied foundations

Method used

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  • Binary Composite Foundation of Discrete Pile-Permeable Concrete Pile and Its Treatment Method
  • Binary Composite Foundation of Discrete Pile-Permeable Concrete Pile and Its Treatment Method
  • Binary Composite Foundation of Discrete Pile-Permeable Concrete Pile and Its Treatment Method

Examples

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Effect test

example 1

[0060] The foundation of a highway is mainly composed of pre-Quaternary bedrock and Quaternary alluvial-diluvial loose accumulation layers. Below the surface are sandy soil, gravel and other strata. The following sequence is: silty clay, silt, silt, fine sand, medium sand, coarse sand, gravel sand, round gravel, bedrock. The main problems are: ①The bearing capacity of the natural foundation is low, and the project requires the bearing capacity of the foundation to be above 250kPa; ②There is a possibility of liquefaction under the action of earthquakes. However, the simple gravel pile composite foundation cannot meet the above requirements, and the gravel pile-permeable concrete pile composite foundation can be used for treatment.

[0061] The gravel piles and permeable concrete piles are arranged in triangular rows. It is required to lay gravel cushion on the foundation surface with a thickness of 40cm. It is required to construct bulk piles first during construction, and th...

example 2

[0065] A commercial building has 13 floors above the ground. The foundation adopts a raft foundation. The thickness of the raft is 0.9m, the depth of the bottom of the raft is 1.6m, and the design value of the base load is 300kPa. According to the engineering geological survey report, the foundation of the building is as follows from top to bottom: ① Miscellaneous fill: 0-1.6m thick, which is construction waste and fill; ② Silty clay: 1.6-7m thick, with a characteristic value of bearing capacity of 150kPa ; ③ Clay: 7-14m thick, characteristic value of bearing capacity is 210kPa; ④ Mudstone: buried depth 14-20m, characteristic value of bearing capacity of foundation is 2100kPa. Due to the insufficient bearing capacity of the natural foundation, it needs to be treated.

[0066] The foundation can be treated by the method of sand pile-permeable concrete pile combined long and short pile composite foundation. The short piles are medium sand piles with a length of 6m and a hole di...

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Abstract

The invention discloses a discrete pile-water permeability concrete pile novel binary composite foundation, which comprises concrete piles and water permeability concrete piles, wherein the concrete piles and the water permeability concrete piles are alternately arranged in rows, and the foundation surfaces of the upper parts of the concrete piles and the water permeability concrete piles are provided with broken stone hardcores. The invention also discloses a treatment method of the composite foundation. The composite foundation belongs to a binary foundation treatment mode integrating high bearing performance and high water discharge performance, the post-construction settlement of the foundation can be reduced, and in addition, the liquefaction resistance capability of the foundation can be effectively improved. In addition, during the concrete pile construction, hyperstatic pore water pressure can be generated in the foundation, the ground surface doming (cohesive soil layers) and the pile settlement (sandy soil layers) can be caused, and the occurrence of engineering harm can be prevented through reducing hyperstatic pore water pressure during the concrete pile construction via the arrangement of the water permeability concrete piles.

Description

technical field [0001] The invention provides a bulk pile-permeable concrete pile composite foundation and a treatment method, belonging to the field of civil engineering. Background technique [0002] In the past two decades, the foundation treatment technology has been greatly developed, and the composite foundation technology is the most widely used. Composite foundation means that part of the soil of the natural foundation is reinforced or replaced during the foundation treatment process. Vertical reinforcements in composite foundations can generally be divided into piles made of bulk materials (such as sand piles and gravel piles), flexible piles (such as cement-soil mixing piles) and rigid piles (such as CFG piles). Gravel piles and other bulk piles are permeable, which can speed up the consolidation speed of the foundation, and can also reduce the liquefaction potential of the sandy soil or silty soil foundation, and the cost is low. However, the simple composite fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D27/12E02D3/08E02D5/34E02D5/38
Inventor 崔新壮金青张炯高智珺
Owner SHANDONG UNIV
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