EP0897035B1 - Geosynthetische Verstärkungsschicht für setzungsgefährdetes Erdreich - Google Patents

Geosynthetische Verstärkungsschicht für setzungsgefährdetes Erdreich Download PDF

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Publication number
EP0897035B1
EP0897035B1 EP98402015A EP98402015A EP0897035B1 EP 0897035 B1 EP0897035 B1 EP 0897035B1 EP 98402015 A EP98402015 A EP 98402015A EP 98402015 A EP98402015 A EP 98402015A EP 0897035 B1 EP0897035 B1 EP 0897035B1
Authority
EP
European Patent Office
Prior art keywords
strands
geosynthetic
group
elongation
fibre
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP98402015A
Other languages
English (en)
French (fr)
Other versions
EP0897035A1 (de
Inventor
Philippe Delmas
Alain Nancey
Jean-Paul Ducol
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MDB Texinov SA
Solmax France SAS
Original Assignee
MDB Texinov SA
TenCate Geosynthetics France
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 MDB Texinov SA, TenCate Geosynthetics France filed Critical MDB Texinov SA
Priority to SI9830900T priority Critical patent/SI0897035T1/sl
Publication of EP0897035A1 publication Critical patent/EP0897035A1/de
Application granted granted Critical
Publication of EP0897035B1 publication Critical patent/EP0897035B1/de
Priority to CY20081100094T priority patent/CY1107155T1/el
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/004—Sealing liners
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/10—Open-work fabrics
    • D04B21/12—Open-work fabrics characterised by thread material
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H13/00—Other non-woven fabrics
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • D04H3/04—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments in rectilinear paths, e.g. crossing at right angles
    • 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
    • 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
    • E02D17/202—Securing of slopes or inclines with flexible securing means
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2403/00—Details of fabric structure established in the fabric forming process
    • D10B2403/02—Cross-sectional features
    • D10B2403/024—Fabric incorporating additional compounds
    • D10B2403/0241—Fabric incorporating additional compounds enhancing mechanical properties
    • D10B2403/02412—Fabric incorporating additional compounds enhancing mechanical properties including several arrays of unbent yarn, e.g. multiaxial fabrics
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/20—Industrial for civil engineering, e.g. geotextiles
    • D10B2505/204—Geotextiles

Definitions

  • the invention relates to a geosynthetic for the reinforcement of earthworks.
  • Geosynthetics and more particularly geotextiles are more and more frequently used as reinforcements in the construction of earthworks, for roads or railways.
  • Certain geotechnical difficulties may be relatively well identified and subject to appropriate and definitive treatment. Other geotechnical difficulties are more complex to identify and sometimes lead the engineer to manage a risk.
  • the technical solution uses a "parachute" reinforcement geotextile used as a preventive measure.
  • the characteristics of this geotextile depend on its position, superficial or deep, the importance of the foci to be treated as well as the maximum permissible surface deflection, permanent and dynamic, depending on the response time for the repair of the work.
  • the service life of the reinforcement should be taken into account after the appearance of the fontis as a function of the traffic on the track above the structure.
  • the object of the invention is to provide a geosynthetic that allows normal operation during the use of the structure and provides a parachute-type security solution in case of collapse of the ground.
  • the invention therefore relates to a geosynthetic which comprises at least one layer of parallel reinforcing strands.
  • This geosynthetic is characterized in that the reinforcing strands are divided into a first group of strands made with a fiber having a high tensile modulus and an elongation value close to 5%, and a second group of strands made with a fiber having a tensile modulus lower than the tensile modulus of the fiber of the first group of strands , and a breaking elongation value of at least 12%.
  • the fiber of the strands of the first group is PVA (polyvinyl acetate) which has an elongation at break of the order of 5%. It should be noted that other fibers may be used, such as glass or aramid, which have a maximum elongation value of 2 or 2.5%, which is too low for .
  • the fibers of the strands of the second group are preferably made of polyester or polypropylene.
  • the geosynthetic according to the invention may advantageously be associated, during the construction of the structure with a second geosynthetic equipped with wires that can break at predetermined elongation values, for example, of 4 and 8% and connected warning devices, this second geosynthetic being disposed on the ground and separated from the geosynthetic according to the invention by a layer of earth which, under its own weight, causes a deformation of the second geosynthetic of 5%, for example, which causes one of the warning devices to come on.
  • FIG. 1 shows the characteristic curve (C) of the elongation of the geosynthetic according to the invention, as a function of the forces exerted on this geosynthetic in the longitudinal or transverse direction of the reinforcing strands equipping this geosynthetic.
  • This curve (C) is given as an indication as regards the tensile strength. This can advantageously be modulated according to the needs of the site.
  • the slope of the curve (C) is high.
  • the forces are taken up by the reinforcing strands having the high modulus of traction and a breaking elongation value of 5%, and which are preferably made of PVA (polyvinyl acetate), and than the other reinforcing strands which have a significantly lower tensile modulus and an elongation at break value of greater than 12%, and preferably equal to 18%, these other strands being made, for example, of polyester or polypropylene.
  • PVA polyvinyl acetate
  • the portion OA of the curve C corresponds to a normal operation of the geosynthetic in a structure.
  • the AB portion corresponds to an alert situation
  • the BD portion corresponds to the use of geosynthetics in parachute mode in case of collapse of the ground under a structure equipped with the geosynthetic according to the invention, for example.
  • FIGS. 2 and 3 show a geosynthetic 10, produced in knitted woven technology, with a nonwoven combination which comprises, in its transverse direction, a plurality of parallel strands or cables 11, 12, distributed in a first group of strands 11 made in PVA fiber and a second group of strands 12 made of polyester or polypropylene fibers.
  • the strands 11 and 12 are integrated, during the manufacture of the geosynthetic 10, with a perfectly rectilinear disposition that does not generate any undulation or shearing effect as in other textile surfaces.
  • strands 11 made of PVA and strands 12 made of polyester or polypropylene are arranged alternately. It is obvious that the density of the two types of strands can be different and calculated according to the use of the geosynthetic 10.
  • Figures 4 and 5 show an advantageous use of the geosynthetic 10 in a civil engineering work 20 disposed on a floor 21 having internal cavities 22 separated from the surface 23 of the floor 21 by vaults 24.
  • a first geosynthetic 25 which includes yarns capable of breaking when the coefficient of elongation of the first geosynthetic 25 is 4%, for example, in order to signal a first level of alert, and son may break when the coefficient of d
  • the elongation of the first geosynthetic is 8%, for example, in order to provide a second level of alert.
  • the weight of the layer H causes the breaking of the son with low coefficient of elongation rupture, and the provision of a first level of alert.
  • the geosynthetic 10 only supports the weight of the structure 20. Beyond a certain deformation of the geosynthetic 10 (5 to 6%), it will transmit additional forces to the first geosynthetic 25 which can lead to the rupture of the wires with a high coefficient of elongation of rupture of the first geosynthetic 25, and the provision of the second level of alert. This second level of alert will be achieved for geosynthetic deformation of the order of 6 or 7%, which is significantly lower than the level of deformation of the polyester strands of the geosynthetic 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Textile Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Woven Fabrics (AREA)
  • Laminated Bodies (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Road Paving Structures (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Prostheses (AREA)
  • Ropes Or Cables (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Bridges Or Land Bridges (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)

Claims (4)

  1. Geosynthetikum vom Typ umfassend wenigstens eine Lage aus parallelen Verstärkungsfäden, dadurch gekennzeichnet, daß die genannten Verstärkungsfäden in eine erste Gruppe aus Fäden, die mit einer Faser gebildet sind, welche einen hohen Zugmodul und einen Bruchdehnungswert nahe 5 % aufweist, sowie in eine zweite Gruppe von Fäden, die mit einer Faser gebildet sind, welche einen niedrigeren Zugmodul als die Faser der ersten Fadengruppe und einen Bruchdehnungswert von wenigstens gleich 12 % aufweist, aufgeteilt sind.
  2. Geosynthetikum nach Anspruch 1, dadurch gekennzeichnet, daß die Faser der Fäden der ersten Gruppe aus Polyvinylacetat besteht.
  3. Geosynthetikum nach irgendeinem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Faser der Fäden der zweiten Gruppe aus Polyester oder aus Polypropylen besteht.
  4. Geosynthetikum nach irgendeinem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß es aus Trikotgewebe unter Einbezug von Vlies gebildet ist.
EP98402015A 1997-08-13 1998-08-07 Geosynthetische Verstärkungsschicht für setzungsgefährdetes Erdreich Expired - Lifetime EP0897035B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI9830900T SI0897035T1 (sl) 1997-08-13 1998-08-07 Geosintetik za napravo za ojačanje zemlje s tveganjem za posedanje
CY20081100094T CY1107155T1 (el) 1997-08-13 2008-01-28 Γεωσυνθετικο υλικο για διαταξη ενισχυσεως εδαφων με κινδυνους κατακρημνισεως

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9710323A FR2767344B1 (fr) 1997-08-13 1997-08-13 Geosynthetique pour dispositif de renforcement de sols a risques d'effondrement
FR9710323 1997-08-13

Publications (2)

Publication Number Publication Date
EP0897035A1 EP0897035A1 (de) 1999-02-17
EP0897035B1 true EP0897035B1 (de) 2007-11-14

Family

ID=9510271

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98402015A Expired - Lifetime EP0897035B1 (de) 1997-08-13 1998-08-07 Geosynthetische Verstärkungsschicht für setzungsgefährdetes Erdreich

Country Status (11)

Country Link
EP (1) EP0897035B1 (de)
AT (1) ATE378475T1 (de)
CY (1) CY1107155T1 (de)
DE (2) DE29825236U1 (de)
DK (1) DK0897035T3 (de)
ES (1) ES2297876T3 (de)
FR (1) FR2767344B1 (de)
MY (1) MY129898A (de)
PT (1) PT897035E (de)
SG (1) SG71141A1 (de)
SI (1) SI0897035T1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2907132B1 (fr) * 2006-10-17 2010-02-26 Mdb Texinov Sa Geotextile composite pour le genie civil et son procede de fabrication
FR2932820B1 (fr) * 2008-06-23 2012-11-16 Mdb Texinov Sa Nappe et grille de renfort avec introduction de fibres minerales pour les ouvrages de genie civil.
FR3029943B1 (fr) 2014-12-11 2016-12-30 Texinov Geosynthetique de renforcement de sol a comportement multi-module

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823748A (en) * 1972-02-14 1974-07-16 Celanese Corp Energy absorbent textile structure
US4540311A (en) * 1981-02-26 1985-09-10 Burlington Industries, Inc. Geotextile fabric construction
DE3763486D1 (de) * 1986-02-21 1990-08-09 Akzo Nv Stuetzgewebe zum stuetzen von sturzgut und verfahren zum bauen von dammaufschuettungen fuer eine strasse, einen staudamm, ein betonbauwerk oder einen koerper vom sturzgut.
AU6853387A (en) * 1986-09-05 1988-03-10 Leucadia, Inc. Subsurface drainage matting
FR2730257B1 (fr) * 1995-02-06 1997-04-25 Colas Sa Membrane bitumineuse a usage geotechnique et son procede de fabrication
US5795835A (en) * 1995-08-28 1998-08-18 The Tensar Corporation Bonded composite knitted structural textiles

Also Published As

Publication number Publication date
SG71141A1 (en) 2000-03-21
DE69838697D1 (de) 2007-12-27
FR2767344A1 (fr) 1999-02-19
CY1107155T1 (el) 2012-10-24
FR2767344B1 (fr) 1999-11-05
ES2297876T3 (es) 2008-05-01
EP0897035A1 (de) 1999-02-17
PT897035E (pt) 2008-02-04
SI0897035T1 (sl) 2008-06-30
DK0897035T3 (da) 2008-03-03
ATE378475T1 (de) 2007-11-15
MY129898A (en) 2007-05-30
DE69838697T2 (de) 2008-10-30
DE29825236U1 (de) 2006-12-21

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