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Pile-supported and rigidity-varied reinforced cushion composite foundation and construction method thereof

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, limited height of embankment, difficult to control settlement, etc. The effect of reducing differential settlement of pavement and ensuring the quality of piles

Active Publication Date: 2017-06-27
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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  • Pile-supported and rigidity-varied reinforced cushion composite foundation and construction method thereof
  • Pile-supported and rigidity-varied reinforced cushion composite foundation and construction method thereof
  • Pile-supported and rigidity-varied reinforced cushion composite foundation and construction method thereof

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Embodiment 1

[0057] The thickness of soft soil in a site is 11m, including silt, silty fine sand, and clay layer. The length of the pile designed by the present invention is 16m, and the prestressed pipe pile is used. The pile diameter is 400mm and the distance is 2.5m. The sandy clay layer is 5m. After the site is leveled, a 200mm thick sandstone layer 2 is laid; after leveling and compaction, the first layer of geogrid 31 is laid; Lay the second layer of geogrid 33 after solidification, pave the 150mm thick cement stabilized crushed stone layer 4 on the second layer of geogrid 33, and compact it; 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 process of the rigid pile composite ground base 1 in this embodiment, the pipe pile ends pass through the soil layer with high compressibility, and enter the soil layer with relatively low compressibility and good properties, a...

Embodiment 2

[0060] It is proposed to build a high-grade highway of 100km in the soft soil area, with a base width of 20m. Assuming that the foundation treatment uses the deep mixing pile method and the pile spacing is the usual 1.2m, 1.4 million piles will be needed, and an investment of 700 million yuan will be required for the pile alone. But if design according to the achievement of the present invention, under the situation that guarantees driving safety, pile spacing is suitably adjusted large, then ground treatment expense can be significantly reduced. According to calculations, if the pile spacing is adjusted to 2.5-3.0m, the investment rate can be reduced by 30%-40%, and the construction quality of the pile body can also be guaranteed.

Embodiment 3

[0062] A test section of an expressway, with a total length of 148.5m, is divided into four tender sections. The four sections are treated in different ways. Each section is equipped with key sections and buried 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 composite foundation and a construction method thereof, which is applicable to the field of civil engineering-foundation. Background technique [0002] At present, the design theories of composite foundations in civil engineering are all based on the research results of composite foundations under rigid foundations, and there are few research results on composite foundations under flexible foundations. Composite foundations under rigid foundations and flexible foundations are different, and there are big differences: 1. Pile load concentration factor, pile-soil load ratio, pile-soil stress ratio, etc. have great differences in development law and value; The contribution of the bearing capacity of the composite foundation is that the rigid foundation is greater than the flexible foundation. 2. The failure mechanisms of composite foundations under flexible foundations and rigi...

Claims

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Application Information

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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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