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TRAINING WORKSHOP ON NON-WOVENS IN GEOTEXTILES AT SURAT

Join the training workshop on non-woven geotextiles in Surat on 5th March 2008. Learn about the types, properties, and applications of geotextiles in various areas such as roads, railways, retaining walls, and more.

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TRAINING WORKSHOP ON NON-WOVENS IN GEOTEXTILES AT SURAT

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  1. TRAINING WORKSHOP ON NON-WOVENS IN GEOTEXTILES AT SURAT 5TH MARCH 2008 BY S.K. PURI CHIEF GENERAL MANAGER - NHAI

  2. National Highways • Total Length of NHs : 65,569 km (2% of total road length) • Roads carry 85% of Passenger and 70% of Freight Traffic • NHs carry about 40% of traffic • NHAI is entrusted with implementation of National Highways Development Project (NHDP)

  3. Components of NHDP

  4. Definition, Type, Process and Properties

  5. What is a Geotextile? Any permeable textile natural or synthetic, used with foundation soil, rock, earth, or any other geotechnical engineering related material. Types of Geotextile Non-woven Woven

  6. Nonwoven Geotextiles

  7. Nonwoven Geotextiles Needle Punched nonwoven Thermally bonded nonwoven

  8. Woven Geotextiles

  9. Woven Geotextiles Slit film tape-on-slit film tape Extruded tape-on-extruded tape

  10. Woven Geotextiles PET multifilament woven fabric Monofil woven fabric

  11. Knitted Geotextiles

  12. Knitted Geotextiles Knitted base Upper surface

  13. Physical Properties

  14. Mechanical Properties

  15. Hydraulic Properties

  16. Endurance Properties g.n.p. – generally no problem, m.b.e. – must be evaluated

  17. Degradation Properties

  18. TYPICAL PHYSICAL PROPERTIES OF GEOTEXTILES

  19. The polymers used for Geotextile Abbreviation: PE: Polyethylene PP: Polypropylene PET: Polyester

  20. Durability Test Methods for Geotextile

  21. Functions and properties of Geotextiles

  22. Separator • Reinforcement • Drainage • Filter • Energy absorber • Container The functions of Geotextiles

  23. Roads Railroads Retaining walls Reservoirs, dams Solid waste Drainage systems Liquid waste Erosion protection APPLICATIONS FOR GEOTEXTILES

  24. 1 ROADS1.1 APPLICATIONS IN FILTRATION AND DRAINAGE applications Pavement drains Sub-horizontal drains Curtains Trenches Settlement acceleration materials Geotextiles Geocomposite drain (PVD)

  25. 1 ROADS1.2 APPLICATIONS IN EROSION CONTROL SUPERFICIAL EROSION silt fences MATERIALS GEOTEXTILES Detain carried particles: during construction, before vegetation or under wind effects

  26. 1 ROADS1.3 APPLICATIONS AS BARRIER MEMBRANE-ENCAPSULATED SOILS - moisture barrier maintenance of base material properties for use in low cost pavements in: wet regions expansive clays good base soils (lateritic soils,..) Materials asphalt impregnated geotextiles reinforced geomembranes geogrids (when hard cracking)

  27. 1 ROADS1.4 SEPARATION AND REINFORCEMENT MATERIALS SEPARATION GEOTEXTILES GEOCOMPOSITES REINFORCEMENT GEOGRIDS GEOTEXTILES GEOSTRIPS

  28. 2 BENEFITS OF GEOSYNTHETIC SEPARATORS2.1 TYPICAL APPLICATIONS Located at the interface between soil and aggregate • prevent contamination • avoid build-up of pore pressure • avoid loss of granular material sub-base/sub-grade interfaces embankments

  29. 2 BENEFITS OF GEOSYNTHETIC SEPARATORS2.2 MECHANISMS Avoid granular material penetration Puncture resistance Filtration Pore size and permeability Interlock advantages Tensile resistance

  30. 3 BENEFITS OF GEOSYNTHETIC REINFORCEMENT 3.1 PAVEMENT SYSTEMS 3.1.1 ASPHALT OVERLAY 3.1.2 BASE/SUBGRADE 3.2 EMBANKMENTS OVER SOFT SOILS 3.3 SLOPES AND WALLS

  31. 3.1 PAVEMENT SYSTEMS 3.1.1ASPHALT REINFORCEMENT new roads Increase in fatigue life Reduction in rutting maintenance of existing roads

  32. 3.1 PAVEMENT SYSTEMS 3.1.1ASPHALT REINFORCEMENT GEOTEXTILE MECHANISMS GEOGRID WITHOUT REINFORCEMENT

  33. 3.1 PAVEMENT SYSTEMS 3.1.1ASPHALT REINFORCEMENT Note: thin nonwoven geotextiles can be used when cracking still keeps the aggregates interlocking (tensile characteristics are not required) The asphalt impregnated geotextile do not acts as a reinforcement, but as a protector layer and a moisture barrier. protector layer - retards crack propagation by deviation moisture barrier – increases life time after cracking

  34. 3.1 PAVEMENT SYSTEMS 3.1.2 SOIL STABILIZATION “The use of a geosynthetic placed at the sub-grade/fill interface to increase the support of construction equipment over a weak or soft sub-grade” Applications Temporary roadways Initial construction lift of permanent ways or embankments Area constructions platforms

  35. 3.1 PAVEMENT SYSTEMS3.1.3 BASE AND SUB-BASE REINFORCEMENT • The use of a geosynthetic placed as a tensile element at the bottom or • within a flexible pavement base or sub-base to: • increase the service life • obtain equivalent performance with a reduced structural section • avoid subsidence problems (sinkholes) Applications Permanents ways Parking lots Airport taxiways Container loading facilities Railway tracks

  36. 3.1 PAVEMENT SYSTEMS3.1.4 ADVANTAGES -cost savings in construction and maintenance -increase of service life -decrease or eliminate over-excavation and required granular fill “in pavements systems, life cycle cost analysis are important to show additional maintenance cost savings”

  37. 3.2 EMBANKMENTS OVER SOFT SOIL3.2.1 Applications -basal reinforcement -piled embankments with basal reinforcement -reinforcement over areas prone to subsidence

  38. 3.2 EMBANKMENTS OVER SOFT SOIL3.2.2 Basal reinforcement mechanisms rotational stability bearing capacity foundation extrusion

  39. 3.2 EMBANKMENTS OVER SOFT SOIL3.2.3 Piled embankments basal reinforcement design Ultimate limit states Pile group capacity Pile group extent Vertical loading shedding Lateral sliding Overall stability Serviceability analysis Reinforcement strain Foundation settlement

  40. 3.2 EMBANKMENTS OVER SOFT SOIL3.2.4 Construction

  41. 3.3 REINFORCED SLOPES AND WALLS3.3.1 applications landslide reparation bridge abutment increase working area reduce filled area reduce filling material

  42. 3.3 REINFORCED SLOPES AND WALLS3.3.2 types reinforcement spacing Walls (angle of inclination larger than 80o) Steep slopes Block walls .

  43. 3.3 REINFORCED SLOPES AND WALLS3.3.2 types

  44. 3.3 REINFORCED SLOPES AND WALLS3.3.3 benefits Economical solutions Rapid and simple construction method Allows construction in difficult terrain Allows use of cheaper fill material Satisfactory appearance structures Environmental: reduce damaged areas and reduce natural material extracting

  45. 4. REQUIREMENTS AND TECHNICAL PROPERTIES • Mainly mechanical characteristics • Tensile strength (ISO 10319) • Seam tensile strength (ISO 10321) • Puncture resistance (ISO 12236) • Impact test (ISO 13433) • Mainly hydraulic characteristics (for separation) • Opening size (ISO 12959) • Permeability normal to the plane (ISO 11058)

  46. Technical Requirement as per MoSRTH Specifications for use in subsurface drains • Breaking load not less than 10 kN/m • Minimum Failure strain of 10% • Apparent opening size 0.22mm – 0.43 as soil properties • Allow water flow @ not less than 10lit/sqm/sec • Minimum puncture resistance of 200 N • Minimum tear resistance of 150N

  47. Technical Requirement as per MoSRTH Specifications for use in Highway Pavement • Minimum Tensile strength 36.3 Kg • Elongation 50% • Asphalt Retention 10 kg/10sqm • Melting Point 150C • Surface Texture- heat Bonded on one side only

  48. Technical Requirement as per MoSRTH Specifications for use in Protection Works • Aperture : Rectangular, square or oval • Colour : Black • Strength : Min 10kN/m • Elongation: Max 15% • Form : GR1-GG3 standards • Life : Min 8 years

  49. Typical Specification of NHAISeparation and drainage

  50. Typical Specification of NHAISoil Reinforcement

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