WO1999014288A1 - Renforcement du sol argileux - Google Patents

Renforcement du sol argileux Download PDF

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Publication number
WO1999014288A1
WO1999014288A1 PCT/GB1998/002838 GB9802838W WO9914288A1 WO 1999014288 A1 WO1999014288 A1 WO 1999014288A1 GB 9802838 W GB9802838 W GB 9802838W WO 9914288 A1 WO9914288 A1 WO 9914288A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibres
soil
clay soil
clay
diameter
Prior art date
Application number
PCT/GB1998/002838
Other languages
English (en)
Inventor
Gurmel Singh Ghataora
Gianmarco Piermaria DALLÁQUA
Original Assignee
The University Of Birmingham
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
Application filed by The University Of Birmingham filed Critical The University Of Birmingham
Priority to AU91734/98A priority Critical patent/AU9173498A/en
Publication of WO1999014288A1 publication Critical patent/WO1999014288A1/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
    • E02D3/005—Soil-conditioning by mixing with fibrous materials, filaments, open mesh or the like
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
    • C09K17/16—Soil-conditioning materials or soil-stabilising materials containing organic compounds only applied in a physical form other than a solution or a grout, e.g. as platelets or granules
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0037—Clays
    • E02D2300/0039—Clays mixed with additives
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0051—Including fibers
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0051—Including fibers
    • E02D2300/0054—Including fibers made from plastic
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0051—Including fibers
    • E02D2300/0054—Including fibers made from plastic
    • E02D2300/0059—PP

Definitions

  • This invention relates to the reinforcement of clay soils, for example, to enable their potential use in road construction, in the manufacture of landfill liners, and in the construction of reinforced embankments for roads and rail.
  • clay soil as used herein includes any clays or clayey soils, i.e. cohesive soils as opposed to particulate soils such as sandy soils which lack cohesion.
  • a method of reinforcing a clay soil comprising the steps of intimately mixing the clay soil with randomly oriented polymer fibres having an average length in the range of 6 to 18 mm; and compacting the resultant mixture.
  • the average length of the fibres is less than 6 mm, then an insufficient improvement in the strength of the clay soil is achieved. If the fibres have an average length of greater than 18 mm, then it is found that there is a tendency for such fibres to ball up during mixing with the result that the strength properties suffer. Preferably, the average length is about 12 mm.
  • the fibres are preferably monofilaments rather than fibrillated and may be straight or crimped fibres and preferably have a diameter of not more than about 100 ⁇ m, typically about 10 to 100 ⁇ m, more preferably about 15 to 60 ⁇ m.
  • the fibres may be typically formed of polypropylene or polyester.
  • the fibres are preferably coated with a dispersing agent to prevent them from aggregating whilst being mixed into the soil.
  • the amount of polymer fibres included may vary from 0J to 1 % by weight based on the total weight of the fibre reinforced clay soil, preferably 0.1 to 0.8% by weight for straight, long fibres or 0.1 to 0.4% by weight for crimped fibre.
  • the method is applied to clay soils stabilized with a stabilizer such as hydrated lime or cement, e.g. Portland cement.
  • a stabilizer such as hydrated lime or cement, e.g. Portland cement.
  • stabilizer When stabilizer is added, it is preferably added in an amount of up to about 10% by weight, more particularly 4 to 8% by weight, most preferably about 6 % by weight.
  • water is included.
  • the amount of water to be included depends upon the nature of the clay soil to be reinforced. Simple tests can be conducted to ascertain the amount of water to be added to give the optimum dry solids density following compaction for any particular type of clay soil. For example, for kaolinite, the optimum water content (i.e. the water content required to give maximum compaction density) is about 23% by weight. It is found that, when fibres are incorporated in accordance with the present invention, an improvement in strength can be achieved in a range either side of the optimum water content, although rather better results are achieved on the dry side of optimum. It is believed that this is as a result of the lubricity imparted to the mixture by the fibres. Thus, it is advantageous for the water content of the mix to be in the range of about 19 to 24% more preferably about 21 to 23% in the case of kaolinite and clay soils having similar optimum water contents.
  • test cylinders were produced each having a length of 100 mm and a diameter of 50 mm by dispersing fibres in water to form a slurry which is then mixed with kaolinite and, in some samples, hydrated lime or cement, followed by moulding and curing.
  • the kaolinite used was a grade of china clay known as Speswhite produced by ECC International Ltd; the fibres were of the type sold by Fibrin (Humberside) Ltd and had the properties indicated in Table 1 below; the hydrated lime was GPR calcium hydroxide as supplied by BDH Ltd; and the cement was Ordinary Portland Cement, class 42.5N produced by rugby Cement.
  • Table 4 shows the relative gains in UCS for fibre-containing kaolinite over plain kaolinite at a water content of 23%.
  • test cylinders (non-stabiliseded kaolinite)

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Soil Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Agronomy & Crop Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

Selon cette invention, on renforce un sol argileux en le mélangeant intimement avec des fibres polymères (telles que le polypropylène ou le polyester) orientées de manière aléatoire et ayant une longueur moyenne comprise entre 6 et 18 mm. Puis on comprime le mélange obtenu. Les fibres sont de préférence des monofilaments plutôt que des fibres fibrillées, et peuvent être droites ou ondulées. Elles ont de préférence un diamètre compris entre 15 et 60 νm. Ces fibres sont recouvertes de préférence d'un agent de dispersion qui les empêche de se regrouper lorsqu'elles sont mélangées au sol.
PCT/GB1998/002838 1997-09-18 1998-09-18 Renforcement du sol argileux WO1999014288A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU91734/98A AU9173498A (en) 1997-09-18 1998-09-18 Clay soil reinforcement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9719761.0 1997-09-18
GBGB9719761.0A GB9719761D0 (en) 1997-09-18 1997-09-18 Clay soil reinforcement

Publications (1)

Publication Number Publication Date
WO1999014288A1 true WO1999014288A1 (fr) 1999-03-25

Family

ID=10819208

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/002838 WO1999014288A1 (fr) 1997-09-18 1998-09-18 Renforcement du sol argileux

Country Status (3)

Country Link
AU (1) AU9173498A (fr)
GB (1) GB9719761D0 (fr)
WO (1) WO1999014288A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000073596A1 (fr) * 1999-05-26 2000-12-07 Alberta Research Council Inc. Composite renforce d'alliage polymere/argile a reseaux interrelies
EP1213393A1 (fr) * 2000-12-06 2002-06-12 Lothar Dr.-Ing. Rauer Procédé pour renforcer des mixtures minérales, en particulier des mixtures terreuses, en utilisant des matériaux fibreux
US6610781B1 (en) 1999-05-26 2003-08-26 Alberta Research Council Inc. Reinforced networked polymer/clay alloy composite
EP3276077A1 (fr) 2016-07-27 2018-01-31 Cemex Research Group AG Procédé de renforcement de sol utilisant un matériau fin et de fibres naturelles
WO2018021981A1 (fr) 2016-07-25 2018-02-01 Kordsa Teknik Tekstil Anonim Sirketi Renforcement du sol avec des fibres discrètes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2095293A3 (fr) * 1970-06-16 1972-02-11 Int Synthetic Rubber
US4867614A (en) * 1986-10-03 1989-09-19 Freed W Wayne Reinforced soil and method
JPH07331241A (ja) * 1994-06-11 1995-12-19 Meiken Kagaku Kogyo Kk 土質材料への混合用の繊維混入エマルジョン
JPH08295883A (ja) * 1995-04-27 1996-11-12 Unitika Ltd 土砂材料の製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2095293A3 (fr) * 1970-06-16 1972-02-11 Int Synthetic Rubber
US4867614A (en) * 1986-10-03 1989-09-19 Freed W Wayne Reinforced soil and method
JPH07331241A (ja) * 1994-06-11 1995-12-19 Meiken Kagaku Kogyo Kk 土質材料への混合用の繊維混入エマルジョン
JPH08295883A (ja) * 1995-04-27 1996-11-12 Unitika Ltd 土砂材料の製造方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 096, no. 004 30 April 1996 (1996-04-30) *
PATENT ABSTRACTS OF JAPAN vol. 097, no. 003 31 March 1997 (1997-03-31) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000073596A1 (fr) * 1999-05-26 2000-12-07 Alberta Research Council Inc. Composite renforce d'alliage polymere/argile a reseaux interrelies
US6610781B1 (en) 1999-05-26 2003-08-26 Alberta Research Council Inc. Reinforced networked polymer/clay alloy composite
US6737472B2 (en) 1999-05-26 2004-05-18 Alberta Research Council Inc. Reinforced networked polymer/clay alloy composite
EP1213393A1 (fr) * 2000-12-06 2002-06-12 Lothar Dr.-Ing. Rauer Procédé pour renforcer des mixtures minérales, en particulier des mixtures terreuses, en utilisant des matériaux fibreux
WO2018021981A1 (fr) 2016-07-25 2018-02-01 Kordsa Teknik Tekstil Anonim Sirketi Renforcement du sol avec des fibres discrètes
EP3276077A1 (fr) 2016-07-27 2018-01-31 Cemex Research Group AG Procédé de renforcement de sol utilisant un matériau fin et de fibres naturelles

Also Published As

Publication number Publication date
GB9719761D0 (en) 1997-11-19
AU9173498A (en) 1999-04-05

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