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Setting and Treatment Method of Drainage Swirl Grouting Pile Foundation Used in Underconsolidated Soil

A treatment method and technology of under-consolidated soil, which is applied in the field of special foundation treatment in geotechnical engineering, to achieve the effect of reducing post-construction settlement, facilitating promotion, and shortening drainage distance

Inactive Publication Date: 2015-08-26
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem: The technical problem to be solved by the present invention is that it is difficult to solve the negative friction resistance, bearing capacity and deformation caused by the self-weight consolidation of the filling soil at the same time, which does not meet the design requirements of the superstructure. In order to solve the problem, a setting and treatment method for drainage jet grouting pile foundation for under-consolidated soil is proposed

Method used

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  • Setting and Treatment Method of Drainage Swirl Grouting Pile Foundation Used in Underconsolidated Soil
  • Setting and Treatment Method of Drainage Swirl Grouting Pile Foundation Used in Underconsolidated Soil

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Embodiment Construction

[0018] 1) Immersed tube compacted sand and gravel pile construction: the material of the pile body is gravel, pebbles, stone chips and other hard materials, the filling coefficient is 1.1-1.3, and the diameter of the gravel is between 20-50mm. According to different site requirements, the construction of immersed tube compacted sand and gravel piles can adopt pile methods such as vibrating tube sinking method, hammer sinking tube method or impact hole forming. To eliminate the liquefaction effect of silt and sandy soil, it is suitable to adopt the vibrating immersed tube method. The construction procedure of immersed tube compacted sand and gravel piles should be constructed from the periphery to the middle in the silt and sandy soil stratum, and from the middle to the periphery in the cohesive soil stratum. If local density is not good for construction, jumping or row-by-row construction can be carried out. The length of the immersed tube compacted sand-stone pile is between...

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Abstract

The invention discloses an arrangement and a processing method for a long firm and oil solidated water draining chemical churning pile foundation. The water draining chemical churning pile foundation comprises water draining immersed tube compaction gravel piles (1) and high pressure jet grouting piles (2). The water draining immersed tube compaction gravel piles (1) and the high pressure jet grouting piles (2) are arranged in separating row and intersection, a gravel water draining cushion ply (6) is paved on the surface of the base of the upper portion of the water draining immersed tube compaction gravel piles (1) and the high pressure jet grouting piles (2), the high pressure jet grouting piles (2) are arranged at a diagonal intersection point of four adjacent water draining immersed tube compaction gravel piles (1), and each of the high pressure jet grouting piles (2) forms a isosceles right triangle arrangement with two adjacent adjacent water draining immersed tube compaction gravel piles (1). The immersed tube compaction gravel piles and the high pressure jet grouting piles are utilized in combination, the water draining immersed tube compaction gravel piles are constructed first, and then the high pressure jet grouting piles are constructed. The water draining immersed tube compaction gravel piles (1) and the high pressure jet grouting piles (2) are arranged in separating row and intersection, and the gravel water draining cushion ply (6) is paved on the surface of the base of the upper portion of the water draining immersed tube compaction gravel piles (1) and the high pressure jet grouting piles (2), so that bearing capacity of the base is increased.

Description

technical field [0001] The invention relates to a setting and treatment method of a drainage jet grouting pile foundation for under-consolidated soil, and belongs to the field of special foundation treatment in geotechnical engineering. Background technique [0002] At present, there are many treatment methods for underconsolidated fill or weak foundation in my country, such as drainage consolidation method, soil replacement cushion filling method, compaction method, immersed tube compacted sand pile method, cement fly ash immersed tube method Compacted gravel pile (CFG) method, high pressure rotary grouting pile method, etc. For the site foundation soil with deep and under-consolidated soil, the drainage consolidation method has slow speed, long construction period and low efficiency; soil replacement cushion filling method and dynamic compaction method are not suitable due to the limitation of treatment depth and effective reinforcement depth; while for For the foundation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/08E02D3/10
Inventor 蔡国军储亚
Owner SOUTHEAST UNIV
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