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A pile bearing variable stiffness reinforced cushion composite foundation and its construction method

A technology of reinforced cushion and composite foundation, which is applied in foundation structure engineering, sheet pile wall, building, etc., can solve the problems of insufficient soil bearing capacity between piles, difficult to control settlement, limited height of embankment, etc. The quality of the piles is guaranteed and the effect of reducing the differential settlement of the pavement

Active Publication Date: 2018-12-28
山东省建筑科学研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a pile-bearing variable stiffness reinforced cushion composite foundation and its construction method. By adjusting the stiffness of the pile top reinforced cushion layer by layer, it can solve the problem of large amount of piles, limited embankment height, and soil load between piles. Insufficient force exertion, differential settlement of road surface is not easy to control, etc.

Method used

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  • A pile bearing variable stiffness reinforced cushion composite foundation and its construction method
  • A pile bearing variable stiffness reinforced cushion composite foundation and its construction method
  • A pile bearing variable stiffness reinforced cushion composite foundation and its construction method

Examples

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Effect test

Embodiment 1

[0057] The thickness of the soft soil on a site is 11m, including silt, fine silt sand, and clay layers. The designed pile length of the invention is 16m and prestressed pipe piles are used. The pile diameter is 400mm and the spacing is 2.5m. The pipe piles penetrate the soft soil layer and enter the lower lying area. Sandy clay layer 5m, 200mm thick sand and gravel layer 2 is laid after leveling the site; the first layer of geogrid 31 is laid after leveling and compaction; 150mm thick gravel layer 32 is laid on the first layer of geogrid 31; After solidification, the second layer of geogrid 33 is laid, and 150mm thick cement stabilized gravel layer 4 is spread on the second layer of geogrid 33, and compacted; after forming a pile-bearing variable stiffness reinforced cushion composite foundation, set it on top Fill the soil layer or directly set the surface layer to build grain depots, storage yards, etc., which meet the design functional requirements.

[0058] In the formation ...

Embodiment 2

[0060] It is proposed to build a high-grade road of 100km in soft soil area with a base width of 20m. Assuming the deep mixing pile method is used for foundation treatment, and the pile spacing is the usual 1.2m, 1.4 million piles are needed, and 700 million piles are required to be invested. Yuan Renminbi; however, if designed according to the results of the present invention, the pile spacing is appropriately increased while ensuring driving safety, the foundation treatment costs can be greatly reduced. According to calculations, adjusting the pile spacing to 2.5-3.0m can reduce the investment rate by 30%-40%, and the pile construction quality is also guaranteed.

Embodiment 3

[0062] The test section of an expressway, with a total length of 148.5m, is divided into four bid sections. The four sections have different treatment methods. Each section has a key section and embedded monitoring instruments.

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Abstract

The invention provides a pile-supported and rigidity-varied reinforced cushion composite foundation and a construction method thereof. The construction method comprises steps as follows: pile body construction of rigid piles is completed in a soft foundation by a pile forming machine, the ground is leveled, a sand and gravel layer which is 150-300 mm thick is laid and is leveled and compacted, then a first geogrid layer is laid, a sand and gravel layer which is 150-300 mm thick is laid on the first geogrid layer and is leveled and compacted, then a second geogrid layer is laid, and a cement stabilized macadam layer which is 150-300 mm thick is laid on the second geogrid layer; finally, road embankment filling is completed. According to the pile-supported and rigidity-varied reinforced cushion composite foundation and the construction method thereof, rigidity of a reinforced cushion is adjusted hierarchically, so that bearing capacity of soil among piles is sufficiently exerted, uneven settlement of a road surface is reduced, and filling limitation at the upper part is broken through. The construction method is suitable for treating foundations of cohesive soil, floury soil, sludge and mucky soil and can be applied to stabilization and treatment of foundations of structures such as earth-filled embankments, flexible surface storage yards, airport runways, oil tanks, grain depots and the like.

Description

Technical field [0001] The invention relates to a pile-bearing variable stiffness reinforced cushion layer composite foundation and a construction method thereof, and is suitable for the field of civil engineering and foundation foundation. Background technique [0002] At present, the design theories of composite foundations in civil engineering are based on the research results of composite foundations under rigid foundations, and there are few research results on composite foundations under flexible foundations. The composite foundation under the rigid foundation and the flexible foundation are different, and there are big differences: 1. The pile load concentration factor, pile-soil load ratio, pile-soil stress ratio, etc. are very different regardless of the development law and magnitude; The contribution of the composite foundation's bearing capacity is that the rigid foundation is greater than the flexible foundation. 2. The failure mechanism of composite foundation under...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D27/12E02D5/58
CPCE02D5/58E02D27/12
Inventor 连峰刘治王明涛胡现虎翟午琛张广龙李乾龙
Owner 山东省建筑科学研究院有限公司
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