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Coconut fiber and coconut geotextile composite reinforced expansive soil roadbed and construction method thereof

A coconut shell fiber and construction method technology, applied in the field of reinforced expansive soil subgrade structure, can solve the problems of unfavorable engineering construction, deformation growth, poor permeability, etc., and achieve the effect of simple and feasible construction technology, strong toughness and low cost

Pending Publication Date: 2022-07-15
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Expansive soil contains strong hydrophilic clay mineral components, which have strong expansion and contraction characteristics, multiple cracks and strength attenuation. Therefore, the expansive soil subgrade has the characteristics of poor permeability, water absorption expansion, dehydration shrinkage, multiple cracks, and humidification, which are extremely unfavorable to engineering construction.

Method used

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  • Coconut fiber and coconut geotextile composite reinforced expansive soil roadbed and construction method thereof
  • Coconut fiber and coconut geotextile composite reinforced expansive soil roadbed and construction method thereof
  • Coconut fiber and coconut geotextile composite reinforced expansive soil roadbed and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1: a kind of coir fiber and coir geotextile composite reinforced expansive soil roadbed, comprising: the subgrade, the subgrade laid on the top surface of the subgrade and the pavement layer laid on the top surface of the subgrade; wherein, the subgrade It includes subgrade base and multi-layer reinforced structural layer; the subgrade base is made of coir fiber and expansive soil mixed and compacted; the reinforced structural layer is laid in the subgrade base from bottom to top at intervals, and the topmost reinforced structural layer is located in the pavement layer. On the bottom surface, the reinforced structural layer is mainly composed of coconut shell geotextile.

[0050] Wherein, the length of the coir fiber is 30mm~120mm, preferably 60mm.

[0051] The optimum dosage of coconut husk fiber is determined by laboratory test, see step 3 of Example 2 for details; the mass ratio of coconut husk fiber to expansive soil is 0.8:100, and the distribution form ...

Embodiment 2

[0060] Embodiment 2: a kind of coir fiber and coir geotextile composite reinforced expansive soil roadbed construction method, such as figure 1 shown, including the following steps:

[0061] Step 1. Flatten and compact the construction site in a horizontal shape, remove the spikes and protrusions, and accurately release the slope line of the subgrade 6. In order to ensure the width of the subgrade 6, each side is widened by 0.5m, and the dried subgrade 7 is adjusted. After leveling, use a 25T vibratory roller to statically press twice, and then use a 50T vibratory roller for four times. The unevenness is manually leveled.

[0062] Step 1 can improve the bearing capacity of the foundation and prevent uneven settlement of the foundation.

[0063] Step 2. Lay a layer of coconut husk geotextile on the base of the roadbed 6 and the top surface of the foundation 7 as an isolation layer to isolate the soil of the foundation 7 from the filler 2, and lay it flat without wrinkles and t...

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Abstract

The invention discloses a coconut fiber and coconut geotextile composite reinforced expansive soil roadbed and a construction method thereof. The coconut fiber and coconut geotextile composite reinforced expansive soil roadbed comprises a foundation layer, a roadbed layer laid on the top surface of the foundation layer and a pavement layer laid on the top surface of the roadbed layer, wherein the roadbed layer comprises a roadbed base body and a plurality of reinforced structure layers; the roadbed base body is formed by mixing and compacting coconut shell fibers and expansive soil, and the reinforced structure layer is mainly composed of coconut shell geotechnical cloth. The expansive soil roadbed mainly solves the problems of poor permeability, water swelling, water loss shrinkage, multiple cracks, humidification and the like of a current expansive soil roadbed, the coconut shell fibers and the coconut shell geotextile are used, the coconut shell fibers and the coconut shell geotextile serve as rib materials, the strength of a soil body is greatly improved, the coconut shell geotextile and the coconut shell fibers are environment-friendly materials, and therefore the expansive soil roadbed is environmentally friendly. And the method plays an important role in protecting the environment and saving resources.

Description

technical field [0001] The invention belongs to a reinforced expansive soil roadbed structure in geotechnical engineering, more particularly relates to a coir fiber and coir geotextile composite reinforced expansive soil subgrade, and also relates to a coir fiber and coir geotextile composite Construction method of reinforced expansive soil subgrade. Background technique [0002] Expansive soils are widely distributed in China. According to the existing data, more than 20 provinces, autonomous regions and municipalities including Guangxi, Yunnan, Hubei, Anhui, Sichuan, Henan and Shandong have expansive soils. Expansive soil contains strong hydrophilic clay minerals, has strong expansion and shrinkage characteristics, multiple fissures and strength attenuation, its particles are highly dispersed, and are very sensitive to changes in environmental humidity and heat. Therefore, the expansive soil subgrade has the characteristics of poor permeability, water expansion, water los...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C3/04E01C3/00E01C11/16E02D3/00D03D15/217D03D9/00
CPCE01C3/04E01C3/00E01C11/16E02D3/00D03D15/217D03D9/00E02D2300/0051
Inventor 李丽华张驰肖衡林李文涛陶高梁刘永莉万娟梅利芳裴尧尧徐维生
Owner HUBEI UNIV OF TECH
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