EP2912230A1 - Structure geotextile - Google Patents
Structure geotextileInfo
- Publication number
- EP2912230A1 EP2912230A1 EP13785559.9A EP13785559A EP2912230A1 EP 2912230 A1 EP2912230 A1 EP 2912230A1 EP 13785559 A EP13785559 A EP 13785559A EP 2912230 A1 EP2912230 A1 EP 2912230A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- geotextile
- structure according
- tubular
- geotextile structure
- anchoring
- 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.)
- Granted
Links
Classifications
-
- 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
- E02D17/18—Making embankments, e.g. dikes, dams
-
- 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
- D04B21/14—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes
- D04B21/16—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes incorporating synthetic threads
-
- 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
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0291—Retaining or protecting walls characterised by constructional features made up of filled, bag-like elements
-
- 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
- D10B2403/023—Fabric with at least two, predominantly unlinked, knitted or woven plies interlaced with each other at spaced locations or linked to a common internal co-extensive yarn system
-
- 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 present invention relates to the field of geotextile structures, and more particularly to that of the field of recess and / or stabilization of soils and embankments, in the context of civil engineering operations. It aims at such a geotextile structure combining both simplicity of implementation and durability over time.
- geosynthetics are traditionally in the form of sheets or layers, anchored in the soil to be stabilized, and placed before the positioning of a facing that will form the front of the embankment, such a facing may for example be made of stones, in molded concrete blocks, or others.
- a facing may for example be made of stones, in molded concrete blocks, or others.
- the confinement of the soil by such geosynthetics in the vicinity of the facing requires the use of suitable formwork, implementation often long, expensive and tedious. Indeed, it is appropriate to bring to the site all the technical means, facing materials and formwork means, thus requiring as many handling operations and implementation.
- the objective of the present invention resides first and foremost in the simplification of the realization of the stabilization of floors, especially furniture, on the one hand, and the realization of embankments on the other hand, particularly in areas with difficulty accessible and therefore in which the contribution of conventional materials is difficult or impossible.
- the invention relates to a geotextile structure comprising a tubular portion, capable of being filled with a granular material, associated with an anchoring ply of the assembly constituting the structure in the soil to be stabilized, or in the backfill. strengthen.
- the invention consists in producing a tubular structure in which are injected aggregates, advantageously of reduced density, capable of absorbing and damping the compressive forces, resulting on the one hand from the embankment that the structure is intended to stabilize as well as operating overloads applied thereto, and secondly, the possible stacking of the geotextile structures of the invention on one another, particularly in the case of slopes, this tubular structure being inked in the ground by means of the sheet with which it is associated.
- the tubular portion and the anchor layer consist of a unitary knitted structure, made by the so-called "knit stitch" technology, and generally free of any seams.
- the structure is particularly feasible on knitting loom type Rachel Rachel double needle.
- it can be envisaged the implementation of seams, in particular for the definition of the tubular part.
- This structure is typically made of high tenacity synthetic fibers, especially polyester, polyethylene, polyamide, polypropylene, PVA (polyvinyl acetate), or even aramid, when it is intended to be subjected to very high stresses. It may also consist of a mixture of these fibers.
- this structure in particular in its tubular part, has a permeability to air to allow the pressure filling of the aggregates, and to obtain a confinement conferring the desired cohesion of the material thus injected.
- this air permeability measured according to standard NF EN ISO 9237, is between 1000 and 10000 L / m 2 .s under a pressure of 1300 Pa, and advantageously between 3000 and 6000 L / m 2 .s, for an opening rate between 10 and 20%.
- the injection of aggregates can be made difficult or impossible because of discharge phenomena related to the pressure of the air inside the tube, for example. In addition, it can no longer be confined or compact said aggregates within the tubular zone, thereby affecting the desired technical effect, especially in terms of strength, rigidity and stability.
- the permeability of the textile will also be adapted to the type of granular material chosen or available on the site, and to the process of injecting the material into the tubes.
- the textile structure has a high tensile modulus to allow adequate pressure on the material filling the tubular portion, and thus ensure the desired confinement effect, without causing significant deformation of the envelope defined by the tubular part, and further, to meet the requirements of very small deformation in the long term, under the effect of the constraints of the civil engineering works for which it is intended.
- the structure can be obtained on Rachel double needle bedding with weft insertion, at least on one of the two textile plies, in order to obtain a different modulus of deformation at the level of the ply. intended for anchoring.
- the yarn inserted in weft may have different strength and elongation depending on whether it is intended to ensure the holding of the tubular zone or that of the anchoring portion.
- the geotextile structure may have two or more tubular parts.
- the diameter of the two extreme tubular portions thus defined may be identical or different.
- Figure la is a schematic representation in cross section of a first embodiment of the geotextile structure of the invention, prior to its filling.
- Figure lb is a view similar to Figure la, but in which the geotextile structure is filled with filling material.
- Figure 2 is a schematic representation in section of the implementation of the geotextile structure of Figures la and lb, in a civil engineering embankment type.
- FIGS 3 and 4 schematically illustrate the mode of confinement within the tabular portion of the geotextile structure of the invention, and the geometric behavior of said tabular portion when it is put under load in the final work.
- Figures 5a, 5b and 5c are schematic cross-sectional views of variants of the geotextile structure of the invention.
- Figure 6 is a schematic representation illustrating the implementation of one of these variants within a backfill.
- Figure 7 is a graph tending to illustrate the tensile curve of the tabular zone of the geosynthetic structure of the invention.
- FIGS. 8a to 8f represent the various steps of the implementation of the structure of the invention for producing, for example, a monolithic cladding.
- Figures 9a, 9b and 9c illustrate the implementation of the structure of the invention for the realization of foundations on soft ground.
- FIGS. 1 and 2 show the geotextile structure according to the invention in cross-section.
- This structure is composed of a unitary knit, obtained, as already indicated by the implementation of the jetty mesh technology, on a loom George double needle, allowing, at the output of the machine, to define the two characteristic zones of the invention, respectively a tabular portion (102) and a flat portion (103), the latter being defined hereinafter by the expression "anchor web”.
- This type of technology makes it possible to produce double-faced textiles, that is to say having two textile surfaces in parallel planes, which may be identical or of different geometries due to the nature and the binding of the threads used. artwork. These two surfaces are simultaneously connected by orthogonal wires substantially perpendicular to said surfaces in order either to connect them completely or not to connect them in specific zones.
- the tubular zone there is no connection between the two textiles: there is only connection on each side to close the tube.
- the two faces are integrally connected by modifying the bindings for this purpose.
- This structure is made based on son or fibers having characteristics, including mechanical strength on the one hand, and physico-chemical on the other hand, compatible with the application envisaged in terms of civil engineering.
- polypropylene polypropylene
- polyvinyl acetate or even aramid
- Other suitable fibers may be used, such as, for example, polyester, polyamide, polyethylene, depending on the chemical environment of the materials.
- tubular portion (102) has a permeability adapted to allow its filling in good compacting conditions with a granular material, as described below.
- FIG. 1b shows the tubular zone (102) filled with a granular material.
- this granular material is advantageously made of low density clay balls.
- this density is of the order of 300 kg / m 3 , compared with a density of 5 to 6 times greater for a standard soil.
- these expanded clay granules have:
- ⁇ 3 to 5 kN / m 3 .
- clay balls marketed under the trademark "LECA” with a particle size of between 10 and 20 millimeters in diameter.
- FIG. 7 shows the tensile curve of the geosynthetic structure of the invention. There are two distinct zones, characterizing the expansion capacity and the final power-up.
- the zone (701) is established at 10 - 15% maximum of deformation, this zone corresponding to the tensioning of the tube during the injection of the granulate inside.
- the zone (702) determines the operating resistance of the geosynthetic from which the service resistance calculated according to the state of the art is determined according to the constraints in the structure.
- the breaking strength is between 40 and 80 kN.
- FIGS. 3 and 4 also show, on the one hand, the effective confinement of the granular material at the level of the tabular part and, on the other hand, its geometric behavior under load and under confinement.
- FIG. 2 illustrates the stacking of the geotextile structures of the invention during their implementation for the realization of a civil engineering work of embankment or slope type, said tabular zones being positioned in front of the structure, in order to constitute the front of the embankment or slope.
- the anchoring plies are each covered with a layer of soil or embankment, which, because of the weight they exert, stiffen the structure and optimize the stability of the front formed by the tabular zones filled with aggregates. or granular material.
- FIGS. 5a, 5b and 5c show variant embodiments of the invention.
- a geotextile structure comprising several tabular areas, in this case of different diameter.
- This variant makes it possible to provide practical and effective solutions to face fixing problems, or to make junctions with other elements. It is then possible to insert tubes, rods or metal bars for example, in these tubular zones so as to allow connections between the layers, in the longitudinal, transverse and vertical directions. Said connections are then able to transmit the desired functional forces.
- the diameter of the tubular zones may vary from a few centimeters, for example from 2 to 10 centimeters, up to 50 or even 100 centimeters, depending on the thicknesses of layers calculated, and depending on the nature of the structure to be reinforced.
- tubular zones of large diameters are intended to constitute the front of the embankment mass to be reinforced, and the tubular zones of small diameters are intended for the passage of rods or metal tubes, for example in order to make skirting cladding, and such as shown in Figure 5c.
- the tubular zones intended to receive such elements are not filled by the aggregates.
- additional tubular zones may also allow the realization of a complementary anchorage in the form of a geosynthetic web bonded by these means to the anchoring ply of the structure.
- Different junction means may be implemented, such as staple or hook systems, as shown in broken lines in Figure 5c.
- FIG. 6 shows the implementation of such a geosynthetic structure.
- This embodiment can also be implemented for the realization of foundation on soft or poor ground, as well as for the realization of railroad track without ballast, as for example illustrated in Figures 9a, 9b and 9c.
- FIGS. 8a-8f show the various steps of producing a monolithic embankment facing, implementing the geosynthetic structure of the present invention.
- FIGS. 8a-8f show the various steps of producing a monolithic embankment facing, implementing the geosynthetic structure of the present invention.
- Said structure prior to filling the tubular zone, is easily transportable on site: it can be in particular roll, and therefore a small footprint.
- the structure of the invention gives the structure to achieve a very high stability, both in terms of mechanical strength than in time.
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Textile Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL13785559T PL2912230T3 (pl) | 2012-10-23 | 2013-10-14 | Konstrukcja geotekstylna |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1260057A FR2997106B1 (fr) | 2012-10-23 | 2012-10-23 | Structure geotextile, notamment pour le renforcement et la stabilisation de sols et de remblais |
PCT/FR2013/052451 WO2014064364A1 (fr) | 2012-10-23 | 2013-10-14 | Structure geotextile |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2912230A1 true EP2912230A1 (fr) | 2015-09-02 |
EP2912230B1 EP2912230B1 (fr) | 2016-12-28 |
Family
ID=47666264
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13785559.9A Not-in-force EP2912230B1 (fr) | 2012-10-23 | 2013-10-14 | Structure geotextile |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2912230B1 (fr) |
FR (1) | FR2997106B1 (fr) |
PL (1) | PL2912230T3 (fr) |
WO (1) | WO2014064364A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111379203A (zh) * | 2020-04-23 | 2020-07-07 | 山东高速股份有限公司 | 土工格栅加筋与膜袋注浆联合降沉装置及降沉方法与应用 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2496115A1 (fr) * | 2005-02-08 | 2006-08-08 | Deltalok Inc. | Systeme mural en sacs de sable qui presentent une constriction |
CN201050067Y (zh) * | 2007-06-14 | 2008-04-23 | 张宇顺 | 具有联锁构件的挡土结构 |
-
2012
- 2012-10-23 FR FR1260057A patent/FR2997106B1/fr not_active Expired - Fee Related
-
2013
- 2013-10-14 WO PCT/FR2013/052451 patent/WO2014064364A1/fr active Application Filing
- 2013-10-14 PL PL13785559T patent/PL2912230T3/pl unknown
- 2013-10-14 EP EP13785559.9A patent/EP2912230B1/fr not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2014064364A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111379203A (zh) * | 2020-04-23 | 2020-07-07 | 山东高速股份有限公司 | 土工格栅加筋与膜袋注浆联合降沉装置及降沉方法与应用 |
CN111379203B (zh) * | 2020-04-23 | 2022-07-01 | 山东高速股份有限公司 | 土工格栅加筋与膜袋注浆联合降沉装置及降沉方法与应用 |
Also Published As
Publication number | Publication date |
---|---|
PL2912230T3 (pl) | 2017-05-31 |
WO2014064364A1 (fr) | 2014-05-01 |
FR2997106A1 (fr) | 2014-04-25 |
FR2997106B1 (fr) | 2014-11-21 |
EP2912230B1 (fr) | 2016-12-28 |
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