WO2019109148A1 - Fibre de renforcement de structures de sol - Google Patents

Fibre de renforcement de structures de sol Download PDF

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Publication number
WO2019109148A1
WO2019109148A1 PCT/AU2018/051311 AU2018051311W WO2019109148A1 WO 2019109148 A1 WO2019109148 A1 WO 2019109148A1 AU 2018051311 W AU2018051311 W AU 2018051311W WO 2019109148 A1 WO2019109148 A1 WO 2019109148A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibre
fibre according
entrant
roughened
knurled
Prior art date
Application number
PCT/AU2018/051311
Other languages
English (en)
Inventor
John Gillis Broinowski
Lance Thompson
Reginald Pitt
Original Assignee
TEXO Australasia Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from AU2017904913A external-priority patent/AU2017904913A0/en
Application filed by TEXO Australasia Pty Ltd filed Critical TEXO Australasia Pty Ltd
Priority to AU2018381334A priority Critical patent/AU2018381334A1/en
Publication of WO2019109148A1 publication Critical patent/WO2019109148A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/20—Securing of slopes or inclines
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
    • E04C5/073—Discrete reinforcing elements, e.g. fibres

Definitions

  • the invention generally relates to the field of fibre reinforced soil structures. Certain embodiments relate to a profiled fibre for reinforcing soil structures.
  • Retaining structures such as mine tailings, dam walls and retarding basins are constructed from soil structures, for convenience and cost efficiencies. To improve the performance of such soil structures when subjected to seismic shocks and/or extreme variations in moisture content, it has been known to utilise reinforcement means within the soil mass.
  • Soil structures may be reinforced systematically such as through the use of additives such as cements, limes and bitumen, through the use of armour or barrier layers such as large stone aggregate layers, through vibration or through other methods.
  • additives such as cements, limes and bitumen
  • barrier layers such as large stone aggregate layers
  • vibration or through other methods One limitation of such systematic reinforcement can be the cost involved, which may be prohibitive for large scale applications.
  • Soil structures may also be reinforced through the inclusion of randomly distributed fibres throughout the soil mass.
  • One limitation of such random reinforcement is that, for known fibres, a high density of fibres per cubic metre of soil mass is required, in some cases between 7kg and 13kg of fibres per cubic metre of soil mass, to achieve the desired level of reinforcement. .
  • an extruded profiled fibre for reinforcing soil structures wherein the fibre has a cross-sectional profile comprising at least two head portions joined by a waisted portion, and each head portion is provided with at least one lobe.
  • Figure 1 A depicts a perspective view of a profiled fibre in accordance with one embodiment of the present disclosure
  • Figure 1 B depicts an end view of the profiled fibre depicted in Figure 1 A;
  • Figure 1 C depicts a plan view of the profiled fibre depicted in Figures 1 A and 1 B;
  • Figure 2 depicts an end view of a profiled fibre in accordance with another embodiment of the present disclosure
  • Figure 3 depicts a perspective view of a profiled fibre in accordance with another embodiment of the present disclosure.
  • the profiled fibre 1 has a cross-sectional profile comprising a first head portion 3 and a second head portion 5, the first and second head portions 3, 5 being joined by a waisted portion 7.
  • a cross-section provides the profiled fibre 1 with an increased surface area at the interface between the fibre 1 and the soil mass (fibre/soil interface) within which it is distributed.
  • the surface tension of the moisture at this interface may allow the moisture to entrap and retain individual grains of the soil mass adjacent the profiled fibre 1 , thereby increasing the reinforcement effect.
  • first and second head portions 3, 5 provide the profiled fibre 1 with double anchoring formations, which may assist in anchoring the fibre 1 in the soil mass within which it is distributed, and in turn assisting to hold the soil mass together. This shape may also assist with retaining moisture at the fibre/soil interface.
  • profiled fibre 1 has a cross-sectional profile comprising a first head portion 3 and a second head portion 5 being joined by a single waisted portion 7
  • the invention is not limited to such a configuration and alternative embodiments may utilise additional head portions joined by additional waisted portions, for example two waisted portions with three head portions, one central and two outer, or three waisted portions with four spaced apart head portions, two inner and two outer.
  • embodiments may include fibre with a cross-sectional profile comprising third, fourth, fifth, sixth, etc. head portions, joined by additional waisted portions.
  • head portions and waisted portions may depend on the balance between factors such as the surface area of the fibre, the overall size of the fibre and its structural rigidity and integrity.
  • the individual head portions may in turn be divided into two or more lobes with intervening bight portions or recesses.
  • the waisted portion 7 has an upper surface 7A and a lower surface 7B, which are depicted as flat, planar surfaces.
  • the upper surface 7A and/or the lower surface 7B may be formed as a curved surface and/or a roughened or knurled surface.
  • the roughened or knurled surface may have a mean peak-to-peak dimension equal to or greater than 0.5 mm and equal to or less than 2.0 mm, and a mean peak-to-valley dimension equal to or greater than 0.01 mm and equal to or less than 0.2 mm. This may further assist with retaining moisture at the fibre/soil interface and increase the anchoring effect of the profiled fibre 1 in the soil mass within which it is distributed. It will be appreciated that the outer surface of the head portions 3 and 5 may also be roughened to achieve a similar effect.
  • 3 lobes 4A, 4B, 4C are formed on the first head portion 3, and 3 lobes 6A, 6B, 6C are formed on the second head portion 5.
  • Upper lobes 4A and 6A extend from their respective head portions in a direction normal to the upper surface 7A of the waisted portion 7.
  • Lower lobes 4C and 6C extend from their respective head portions in a direction normal to the lower surface 7B of the waisted portion 7.
  • Central lobes 4B and 6B extend from their respective head portions in a direction parallel to the waisted portion 7.
  • the profiled fibre 1 provides the profiled fibre 1 with an additional increase in surface area at the fibre/soil interface.
  • the upper lobes 4A and 6A, and the lower lobes 4C and 6C further extend the anchoring formations provided by the two head portions 3, 5, which may further enhance the anchoring effect of the profiled fibre 1 in the soil mass within which it is distributed, in particular in conjunction with similar randomly distributed fibres.
  • first and second head portions 3, 5 of the profiled fibre 1 are each provided with 3 lobes, it will be appreciated that alternative embodiments may utilise different lobe configurations.
  • the first and second head portions 3, 5 may be provided with only the upper lobes 4A, 6A, respectively, and/or only the lower lobes 4C, 6C, respectively.
  • at least the central lobes 4B, 6B are omitted from the first and second head portions 3, 5.
  • the first and second head portions 3, 5 are not provided with multiple lobes, but are simply bulbous.
  • the profiled fibre 1 may be formed from a hydrophilic, polymer material, which can further assist with retaining moisture at the fibre/soil interface.
  • the profiled fibre is formed from a material consisting essentially of polypropylene. More specifically, the material comprises between 10% and 90%, preferably between 60% and 90%, by weight, inclusive, of polypropylene, with the remainder typically being made up of polyethylene.
  • a profiled fibre 100 for reinforcing soil structures in accordance with another embodiment of the present disclosure will now be described with reference to Figure 2. Similar to the profiled fibre 1 described above, the profiled fibre 100 has a cross- sectional profile comprising a first head portion 103 and a second head portion 105, the first and second head portions 103, 105 being joined by a waisted portion 107.
  • first head portion 103 and the second head portion 105 are each provided with central lobes 104 and 106, respectively, which extend from their respective head portions in a direction parallel to the waisted portion 107, similar to the central lobes 4B and 6B of profiled fibre 1 .
  • First head portion 103 is further provided with an outer, upper re-entrant protrusion 109A and an inner, upper re-entrant protrusion 109B, along with an outer, lower re-entrant protrusion 1 1 1 A and an inner, lower re-entrant protrusion 1 1 B.
  • second head portion 105 is provided with an outer, upper re-entrant protrusion 1 13A and an inner, upper re-entrant protrusion 1 13B, along with an outer, lower re-entrant protrusion 1 15A and an inner, lower re-entrant protrusion 1 15B.
  • 1 1 1 A, 1 13A, 1 15A extends in a direction away from the waisted portion 107 such that a recess 1 10A, 1 12A, 1 14A, 1 16A, respectively, is formed between the re-entrant protrusion and sections of the respective head portion and central lobe.
  • each of the inner, upper and lower re-entrant protrusions 109B, 1 1 1 B, 1 13B, 1 15B extend in a direction towards the waisted portion 107 such that recesses 1 10B, 1 12B,
  • each of these recesses may be configured to capture moisture at the fibre/soil interface and thereby assist in anchoring the fibre 100 in the soil mass within which it is distributed.
  • first and second head portions 103, 105 of profiled fibre 1 are each provided with four re-entrant protrusions, it will be appreciated that alternative embodiments may utilise different configurations of re-entrant protrusions.
  • the first and second head portions 103, 105 may be provided with only the upper re-entrant protrusions, or only the lower re-entrant protrusions.
  • the first and second head portions 103, 105 may be provided with only the outer re-entrant protrusions, or only the inner re-entrant protrusions.
  • the first and second head portions 103, 105 are not provided with any re-entrant protrusions.
  • each of the re-entrant protrusions is provided with an outer surface that is a substantially planar surface formed substantially parallel to the waisted portion 107. It will be appreciated that one or more the re-entrant protrusions of alternative embodiments may be provided with an outer surface that is a substantially curved or irregular surface, or is a substantially planar surface that is not formed substantially parallel to the waisted portion 107.
  • profiled fibre 100 may be formed from the same material as the profile fibre 1 described above.
  • the profiled fibres 1 , 100 may formed utilising extrusion and post-extrusion processing methods, some of which may be proprietary. It will be appreciated that the crystallisation of the polymer material may be increased by stretching to increase the tensile strength of the fibre. Fibres of this type may be obtained from Texo Australasia Pty Ltd of 37 Enterprise Circuit, Prestons, Sydney NSW 2170, Australia.
  • the re-entrant protrusions of the profiled fibre 100 that define the recesses for receiving soil particles may be formed by rolling, to plastically deform the upper lobes 4A and 6A and the lower lobes 4C and 6C provided on each head portion.
  • a pair of knurled or otherwise roughened rollers may be used to plastically deform the upper lobes 4A and 6A and the lower lobes 4C and 6C provided on each head portion such that the outer surfaces of the protrusions are formed as knurled or roughened surfaces.
  • Figure 3 depicts another embodiment of a profiled fibre 200 for reinforcing soil structures, which is substantially similar to the profiled fibre 100 described above.
  • the differences between the two fibres 100, 200 include the re-entrant protrusions provided on each head portion.
  • each of the re-entrant protrusions is provided with an outer surface that is a substantially curved surface.
  • the substantially curved surfaces of each pair of coplanar outer and inner re-entrant protrusions, respectively, are connected by a knurled or roughened surface 224A, 226A that is formed substantially planar and parallel to the waisted portion 207.
  • these re-entrant protrusions of profiled fibre 200 may be formed by plastically deforming the upper lobes 4A and 6A and the lower lobes 4C and 6C provided on each head portion of profiled fibre 1 , by an amount less than profiled fibre 100. This plastic deformation may occur through a rolling process.
  • the knurled or roughened surface 224A, 226A may be formed during the rolling process, with knurled or otherwise roughened rollers, or during an additional surface treatment that occurs after the rolling process. It will be appreciated that the dimensions of the profiled fibres 1 , 100, 200 may be adjusted to suit the particular application in which it will be used.
  • the waisted portions 7, 107, 207 may have a height“C” equal to or greater than 0.1 mm and equal to or less than 3.0 mm.
  • the height“C” of the waisted portions 7, 107 is from 0.1 mm to 0.5 mm or 0.2 mm to 0.4 mm, inclusive, or is 0.3 mm.
  • the profiled fibres 1 , 100, 200 may have a length equal to or greater than 5.0 mm and equal to or less than 65 mm.
  • the length of the profiled fibres 1 , 100, 200 is between 40 mm and 60 mm, inclusive.
  • the overall height ⁇ ” of the profiled fibres 1 , 100, 200 may be equal to or greater than 0.1 mm and equal to or less than 3.0 mm.
  • the overall height ⁇ ” of the profiled fibres 1 , 100, 200 is between 0.1 mm and 0.75 mm, inclusive. More preferably, the overall height“E” of the profiled fibres 1 , 100 is between 0.1 mm and 0.5 mm, inclusive.
  • the overall width“B” of the profiled fibres 1 , 100, 200 may be equal to or greater than 0.1 mm and equal to or less than 5.0 mm.
  • the overall width“B” of the profiled fibres 1 , 100, 200 is between 0.1 mm and 2 mm, inclusive. More preferably, the overall width“B” of the profiled fibres 1 , 100 is between 0.1 mm and 0.3 mm, inclusive.
  • the aspect ratio of the profiled fibres 1 , 100, 200, calculated by dividing the length of the fibre 1 , 100 by the mean diameter of the fibre 1 , 100, 200, is preferably equal to or greater than 200 and equal to or less than 600.
  • each head portion may describe a substantially circular profile.
  • Such a substantially circular profile may have a nominal radius of 0.21 mm.
  • each of the lobes may describe a substantially circular profile.
  • Such a substantially circular profile may have a nominal radius of 0.12 mm.
  • the density of the profiled fibres 1 , 100, 200 within a soil structure may be between 3 kg and 8 kg, inclusive, of fibres per cubic metre of soil mass.
  • the profiled fibres 1 , 100, 200 may be distributed evenly throughout the soil structure using known techniques such as blowing, auger, spray and rotary mass stabilisation.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Agronomy & Crop Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • Road Paving Structures (AREA)

Abstract

La présente invention concerne une fibre profilée extrudée pour renforcer des structures de sol, la fibre ayant un profil en coupe transversale comprenant au moins deux parties de tête jointes au moyen d'une partie étranglée, et chaque partie de tête étant pourvue d'au moins un lobe.
PCT/AU2018/051311 2017-12-06 2018-12-06 Fibre de renforcement de structures de sol WO2019109148A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2018381334A AU2018381334A1 (en) 2017-12-06 2018-12-06 Fibre for reinforcing soil structures

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2017904913A AU2017904913A0 (en) 2017-12-06 Fibre for reinforcing soil structures
AU2017904913 2017-12-06

Publications (1)

Publication Number Publication Date
WO2019109148A1 true WO2019109148A1 (fr) 2019-06-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2018/051311 WO2019109148A1 (fr) 2017-12-06 2018-12-06 Fibre de renforcement de structures de sol

Country Status (2)

Country Link
AU (1) AU2018381334A1 (fr)
WO (1) WO2019109148A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033781A (en) * 1976-01-09 1977-07-05 Amtech, Inc. Fiber reinforced structural material
US4790691A (en) * 1986-10-03 1988-12-13 Freed W Wayne Fiber reinforced soil and method
US4867614A (en) * 1986-10-03 1989-09-19 Freed W Wayne Reinforced soil and method
US20030134116A1 (en) * 2001-12-27 2003-07-17 Reddy Hari P. Plastic fibers for improved concrete
US20120146254A1 (en) * 2005-09-30 2012-06-14 Eidgenössische Materialprüfungs-Und Forschungsanstalt Bi-Component Plastic Fibers For Application in Cement-Bonded Building Materials
US20120196081A1 (en) * 2009-10-08 2012-08-02 Klaus Friedrich Gleich New binder composition
WO2013190460A2 (fr) * 2012-06-20 2013-12-27 Marco Goretti Procédé pour obtenir des fibres pour l'utilisation dans des articles à base de ciment résistant au feu
US20140011030A1 (en) * 2011-03-31 2014-01-09 Daiwabo Polytec Co., Ltd. Fibers for reinforcing cured article and cured article using same
WO2017147199A1 (fr) * 2016-02-22 2017-08-31 Abc Polymer Industries, Llc Fibres de renfort pour béton

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033781A (en) * 1976-01-09 1977-07-05 Amtech, Inc. Fiber reinforced structural material
US4790691A (en) * 1986-10-03 1988-12-13 Freed W Wayne Fiber reinforced soil and method
US4867614A (en) * 1986-10-03 1989-09-19 Freed W Wayne Reinforced soil and method
US20030134116A1 (en) * 2001-12-27 2003-07-17 Reddy Hari P. Plastic fibers for improved concrete
US20120146254A1 (en) * 2005-09-30 2012-06-14 Eidgenössische Materialprüfungs-Und Forschungsanstalt Bi-Component Plastic Fibers For Application in Cement-Bonded Building Materials
US20120196081A1 (en) * 2009-10-08 2012-08-02 Klaus Friedrich Gleich New binder composition
US20140011030A1 (en) * 2011-03-31 2014-01-09 Daiwabo Polytec Co., Ltd. Fibers for reinforcing cured article and cured article using same
WO2013190460A2 (fr) * 2012-06-20 2013-12-27 Marco Goretti Procédé pour obtenir des fibres pour l'utilisation dans des articles à base de ciment résistant au feu
WO2017147199A1 (fr) * 2016-02-22 2017-08-31 Abc Polymer Industries, Llc Fibres de renfort pour béton

Also Published As

Publication number Publication date
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