NZ743708A - A subgrade stability reinforcement and filter composite - Google Patents
A subgrade stability reinforcement and filter composite Download PDFInfo
- Publication number
- NZ743708A NZ743708A NZ743708A NZ74370818A NZ743708A NZ 743708 A NZ743708 A NZ 743708A NZ 743708 A NZ743708 A NZ 743708A NZ 74370818 A NZ74370818 A NZ 74370818A NZ 743708 A NZ743708 A NZ 743708A
- Authority
- NZ
- New Zealand
- Prior art keywords
- woven fabric
- reinforcement
- nonwoven fabric
- fabric
- subgrade
- Prior art date
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- 239000002131 composite material Substances 0.000 title claims abstract description 36
- 230000002787 reinforcement Effects 0.000 title claims abstract description 36
- 239000002759 woven fabric Substances 0.000 claims abstract description 47
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 36
- 239000004743 Polypropylene Substances 0.000 claims description 10
- -1 polypropylene Polymers 0.000 claims description 10
- 229920001155 polypropylene Polymers 0.000 claims description 10
- 238000001914 filtration Methods 0.000 abstract description 11
- 238000010276 construction Methods 0.000 abstract description 10
- 239000004744 fabric Substances 0.000 abstract description 9
- 230000006870 function Effects 0.000 abstract description 8
- 238000000926 separation method Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- 238000004826 seaming Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 21
- 239000004746 geotextile Substances 0.000 description 13
- 239000002689 soil Substances 0.000 description 9
- 230000035699 permeability Effects 0.000 description 7
- 230000003864 performance function Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 238000006065 biodegradation reaction Methods 0.000 description 3
- 238000002144 chemical decomposition reaction Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004224 protection Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Nonwoven Fabrics (AREA)
- Road Paving Structures (AREA)
- Filtering Materials (AREA)
Abstract
The invention relates to a subgrade stability reinforcement and filter composite, comprising woven fabric and nonwoven fabric, with the woven fabric set on top of the nonwoven fabric; the woven and nonwoven fabric are structurally attached together as an integral composite material using multiple parallel stitch line seams. The subgrade stability reinforcement and filter composite of the present invention can more effectively provide combined application functions of reinforcement, separation, filtration, and drainage; to maintain the subgrade stability of the railways, highways, access roads, airport runways, and other structural load bearing platform applications. The use of multiple parallel stitch line seaming method of the two fabric surfaces can effectively prevent the relative slippage of the woven fabric and nonwoven fabric in whole or in part, reduce construction time and cost, and improve engineering stability and construction.
Description
A SUBGRADE STABILITY REINFORCEMENT AND FILTER COMPOSITE
TECHNICAL FIELD
The present invention relates to the field of geosynthetic materials, particularly relates to
a subgrade stability reinforcement and filter composite.
BACKGROUND ART
Geosynthetic materials are synthetic materials used in geotechnical engineering and civil
engineering applications. Geosynthetic materials include geotextiles, geogrids, geomattresses,
geomats, geonets, etc. Geotextiles are water permeable fabrics that may be produced using
weaving technology, with advantages of lightweight, overall structural continuity, easy
installation in construction applications and high tensile modulus properties, thus commonly
used in subgrade enhancement and separation applications. Geotextiles can be divided into
woven geotextiles and nonwoven geotextiles, the former is woven using mono-filament yarns,
multi-filament yarns and/or tape yarns, and the latter is made using staple fibres or continuous
filaments laid onto a webbing surface, then subjected to mechanical entanglement,
heat-bonding or chemical bonding process. Geotextiles are commonly used for railways,
highways, access roads, airport runways, and other structural load bearing platform subgrade
stability improvement applications. Geotextiles can increase the bearing capacity of subgrade
and improve construction efficiency; geotextiles can act as a soil filter, preventing intermixing
of subgrade soil with basecourse or ballast material under action of rainfall or imposed load,
thereby preserving the integrity and strength of basecourse or ballast material over time.
Additionally, geotextiles can sustain part of the stresses induced by imposed load, dispersing
the stresses over the subgrade soil attached closely to the geotextiles, thereby improving the
bearing capacity of the subgrade.
Geosynthetic materials may individually have performance functions such as separation,
filtration, reinforcement, protection, barrier or drainage. In practical engineering projects,
multiple performance functions are required, resulting in requirement of usage of multiple
geosynthetic materials. If multiple geosynthetic materials are simply overlapped with each
other, slippage may occur at the interface between the geosynthetic materials, thereby
preventing the development of composite performance functions without compromising other
safety and stability concerns in design and application. Also, the laying of multiple
geosynthetic materials will increase construction time and cost when compared to the laying
of a single composite geosynthetic material with multiple performance functions. Composite
geosynthetic materials will overcome the above problems. Composite geosynthetic materials
combine a variety of geosynthetic materials into a single entity. Multiple individual layers of
geosynthetic materials are structurally connected to become a structurally integrated entity.
Compared to single geotextiles, composite geosynthetic materials have multiple performance
functions and perform more stable effect.
In the prior art, composite geosynthetic materials are usually made by bonding two or
more individual layers of geosynthetic materials through adhesion treatment. Adhesion
treatment includes the use of adhesive bonding or heat treatment bonding. However, using
adhesive or heat treatment to bond composite geosynthetic materials is complex, and the
composite geosynthetic materials tend to become stiff, thus cannot maintain good flexibility
and stress resistance.
SUMMARY OF THE INVENTION
In order to solve the above problems, the objective of the present invention is to provide
a subgrade stability reinforcement and filter composite.
In order to achieve the above objective, the present invention provides a subgrade
stability reinforcement and filter composite, it includes woven fabric and nonwoven fabric,
the woven fabric is set on top of the nonwoven fabric; and the woven fabric and the
nonwoven fabric are structurally attached together as an integral composite material using
multiple parallel stitch line seams.
As can be seen from above, the subgrade stability reinforcement and filter composite is
formed by sewing the upper woven fabric and the lower nonwoven fabric. Among them, the
woven fabric has high tensile modulus, good creep resistance, and good reinforcement effect
on the subgrade. The nonwoven fabric has small opening size, in-plane drainage performance
function, high flexibility, and low cost. The woven fabric is set on top of the nonwoven fabric,
the woven fabric is in contact with basecourse or ballast material above, able to perform
reinforcement and stress alleviation functions, and at the same time the large sized soil
particles are filtered; the nonwoven fabric is in contact with the subgrade soil, able to perform
filtration of small sized soil particles, while allowing uniform dissipation of pore water
pressures. The integral subgrade stability reinforcement and filter composite can more
effectively provide combined reinforcement and filtration functions to maintain the subgrade
stability of the railways, highways, access roads, airport runways, and other structural load
bearing platform applications. The use of multiple parallel stitch line seaming method of the
two fabrics can effectively prevent the relative slippage of the woven fabric and the
nonwoven fabric in whole or in part, reducing time and cost when laying the resulting
composite, thereby improving engineering and construction stability.
A preferred technical solution is that the woven fabric is a twill fabric.
As can be seen from above, the woven fabric of the present invention adopts a twill
woven fabric, the twill woven fabric has good wrinkle resistance and strength, the yarns are
arranged tightly, the gap between warp and weft yarns is small, and in addition three
dimensional voids are formed between adjacent yarns in the direction perpendicular to fabric
surface, resulting in high cross plane permeability for effective dissipation of subgrade pore
pressures, resulting in more effective subgrade stability reinforcement and separation
performance.
A preferred technical solution is that the woven fabric is a polypropylene yarn woven
fabric.
As can be seen from above, the woven fabric of the present invention adopts a
polypropylene yarn woven fabric. The polypropylene yarn woven fabric has high tensile
modulus, good abrasion resistance, good chemical degradation resistance and good
biodegradation resistance properties, remain stable in both wet and dry conditions, and can
perform consistently the role of effective subgrade stability reinforcement performance.
A preferred technical solution is that the nonwoven fabric is a polypropylene nonwoven
fabric.
As can be seen from above, the nonwoven fabric of the present invention adopts a
polypropylene nonwoven fabric; the polypropylene nonwoven fabric has elasticity, good
chemical degradation resistance and good biodegradation resistance properties, good cross
plane and in plane permeabilities for effective dissipation of subgrade pore water pressures,
and small opening size to provide the filtration application function and prevent migration and
transfer of small sized soil particles across the polypropylene nonwoven fabric.
A preferred technical solution is that the multiple parallel stitch line seams is aligned in
the warp direction of the woven fabric.
As can be seen from above, in order to facilitate the fabrication of the subgrade stability
reinforcement and filter composite, warp aligned multiple parallel stitch line seams can result
in continuous multiple parallel stitch line seaming over long rolls of fabrics.
A preferred technical solution is that the interval spacing between two adjacent parallel
stitch line seams may be fixed or varied.
As can be seen from above, the interval spacing between two adjacent parallel stitch line
seams may be fixed or varied. According to the engineering design and construction
requirements, the interval spacing between two adjacent parallel stitch line seams can be
appropriately selected and adjusted.
A preferred technical solution is that the interval spacing between two adjacent parallel
stitch line seams can vary from 5 cm to 100 cm.
As can be seen from above, the interval spacing between two adjacent parallel stitch line
seams can be adjusted. Considering the structural bonding requirements between the woven
and nonwoven fabrics and cost, stitch line seams spacing can be optimized. The interval
spacing between two adjacent parallel stitch line seams can be as narrow as 5 cm to as wide as
100 cm. Of course, under some special application, the interval spacing can be narrower than
cm or wider than 100 cm.
BRIEF DESCRIPTION OF THE DRAWING
Fig.1 is schematic structural view of an embodiment of the present invention.
The present invention will be further described with reference to the drawing and
embodiment.
DETAILED DESCRIPTION OF THE INVENTION
As shown in Fig.1, the subgrade stability reinforcement and filter composite includes a
woven fabric 11 as an upper layer fabric and a nonwoven fabric 12 as a lower layer fabric, the
woven fabric 11 and the nonwoven fabric 12 is subject to multiple parallel stitch line seaming
to result in multiple parallel stitch line seams 13.
In the present embodiment, the woven fabric 11 is a twill woven fabric. The woven
fabric 11 has high tensile modulus, good abrasion resistance, good chemical degradation
resistance and good biodegradation resistance properties, remain size-stable in both wet and
dry conditions, and can perform consistently the role of effective subgrade stability
reinforcement and separation performance. In addition, three dimensional voids are formed
between adjacent yarns in the direction perpendicular to fabric surface, and the voids are
small, resulting in high cross plane permeability for effective dissipation of subgrade pore
pressures, resulting in more effective subgrade stability reinforcement and separation
performance.
In the present embodiment, the nonwoven fabric 12 is a polypropylene nonwoven fabric
having good filtration and water permeability properties.
In the present embodiment, the interval spacing between two adjacent parallel stitch line
seams 13 is fixed, selected from 5 cm to 100 cm, preferably 20 cm. The uniform spacing
between two adjacent parallel stitch line seams 13 can prevent slippage between woven fabric
11 and nonwoven fabric 12 for subgrade reinforcement application. A spacing of 20 cm is
sufficient for railways and highways subgrade reinforcement. Of course, the interval
spacing between two adjacent stitch line seams 13 can be varied, i.e. the interval spacing
between two adjacent stitch line seams 13 do not have a fixed value.
In the present embodiment, the parallel stitch line seams 13 are aligned in the warp
direction of the woven fabric. When the woven fabric 11 is produced, the woven fabric 11 is
rolled up on a core in the warp direction to produce a large master roll with long continuous
woven fabric 11 length. When preparing subgrade reinforcement and filter composite, a large
master roll of the woven fabric 11 and the nonwoven fabric 12 are seamed by the stitch line
seams 13, and continuous large scale production can be performed by mechanical device.
To further describe the properties of the subgrade stability reinforcement of the present
invention, property comparisons between subgrade stability reinforcement and filter
composites (HP380a+nonwoven, H580a+nonwoven) and single woven geotextiles(H380a,
HP580a) and a single nonwoven geotextile (nonwoven) are shown in Table 1
Table 1: Properties
Property Test Unit nonwoven HP380a HP380a + HP580a HP580a +
Method nonwoven nonwoven
Tensile modulus ISO kN/m 17.5 765 795 1015 1120
at 2% strain in 10319
Tensile modulus ISO kN/m 12 1245 1305 1945 2090
at 2% strain in CD 10319
CBR puncture ISO kN 3.1 7.0 7.9 11.5 12.9
strength 12236
Opening size, O90 ISO mm 0.05 0.26 0.12 0.25 0.11
12956
Permeability ISO cm/s 0.045 0.10 0.19 0.08 0.22
11058
Table 1 shows the technical properties of woven fabric HP380a, woven fabric HP580a,
nonwoven fabric, and composites of HP380a and HP580a with nonwoven fabrics. For
railways, highways, access roads, airport runways, and other structural load bearing platform
subgrade stability improvement applications, tensile modulus at 2% is indicative of the
reinforcement ability, wherein the higher the tensile modulus, the better the reinforcement
ability; CBR puncture strength is indicative of the ability to resist puncture due to
construction stresses, wherein the higher the CBR puncture strength, the better the ability to
resist to puncture; Opening size, O90, is indicative of the ability to prevent cross migration of
soil particles in a filtration application function, wherein the smaller the opening size, the
better the filtration performance with respect to soil particle retention; Permeability is
indicative of the ability to allow water flow through in a filtration application function,
wherein the larger the permeability, the better the filtration performance with respect to
prevention of pore water pressure backlog.
As shown Table 1, the key technical properties of the composites are better than those of
the individual woven fabrics or nonwoven fabric using alone.
As can be seen from above, the subgrade stability reinforcement and filter composite of
the present invention, through the process of structural integration of the woven fabric and the
nonwoven fabric, thereby combining the different application functions of woven fabric and
nonwoven fabric within a composite product, can more effectively exhibit and perform the
combined application functions of reinforcement, separation, filtration, and drainage,
maintain subgrade stability, and improve long term performance and integrity of railways,
highways, access roads, airport runways, and other structural load bearing platform
applications. The present invention, through systematic seaming, the woven fabric and the
nonwoven fabric are prevented from relative slippage in whole or in part, thus the
construction time and cost are reduced, and the construction and application stability is
improved.
It will be understood that the term “comprise” and any of its derivatives (eg comprises,
comprising) as used in this specification is to be taken to be inclusive of features to which it
refers, and is not meant to exclude the presence of any additional features unless otherwise
stated or implied.
The reference to any prior art in this specification is not, and should not be taken as, an
acknowledgement of any form of suggestion that such prior art forms part of the common
general knowledge.
Finally, it is noted that the above-mentioned preferable embodiment of the present
invention is not intended to limit the present invention. For a skilled person in the art, the
present invention is susceptible to various modifications and changes. Such modifications and
changes may relate to the selection of woven fabric, nonwoven fabric and the interval spacing
between two adjacent parallel stitch line seams. Any modifications, equivalent replacements,
improvements and the like made within the spirit and principle of the present invention shall
fall within the scope of protection of the present invention.
Claims (7)
1. A subgrade stability reinforcement and filter composite, comprising woven fabric and nonwoven fabric, with the woven fabric set on top of the nonwoven fabric; the woven fabric and the nonwoven fabric are structurally attached together as an integral composite material using multiple parallel stitch line seams.
2. A subgrade stability reinforcement and filter composite according to claim 1, wherein the woven fabric consists of a twill weave.
3. A subgrade stability reinforcement and filter composite according to claim 1, wherein the woven fabric is of the kind woven by polypropylene yarns.
4. A subgrade stability reinforcement and filter composite according to claim 1, wherein the nonwoven fabric is of the kind formed by polypropylene filament yarns.
5. A subgrade stability reinforcement and filter composite according to claim 1, wherein the multiple parallel stitch line seams are arranged along the warp direction of the woven fabric.
6. A subgrade stability reinforcement and filter composite according to any one of claims 1 to 5, wherein the interval spacing between two adjacent parallel stitch line seams is fixed or varied.
7. A subgrade stability reinforcement and filter composite according to claim 6, wherein the interval spacing between two adjacent parallel stitch line seams is from 5 cm to 100 cm. - 8 - FIG. 1
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720771039.2 | 2017-06-28 | ||
| CN201720771039.2U CN207552832U (en) | 2017-06-28 | 2017-06-28 | A kind of subgrade stability reinforcement strainer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ743708A true NZ743708A (en) | 2018-11-30 |
| NZ743708B NZ743708B (en) | 2019-03-01 |
Family
ID=
Also Published As
| Publication number | Publication date |
|---|---|
| PH12018000168A1 (en) | 2019-03-25 |
| AU2018204590A1 (en) | 2019-01-17 |
| CN207552832U (en) | 2018-06-29 |
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