Geosynthetic Solutions

Transcription

1 Geosynthetic Solutions For Paved and Unpaved Applications Dave Lipomi

2 Tensar Products and Applications Geogrids Uniaxial-Walls and Reinforced Slopes Biaxial-Reinforced Slopes, Roads, Foundations, Crane Pads, Rail Triaxial- Roads, Foundations, Crane Pads, Rail GlasGrid- Pavement Interlayer RoaDrain- Roadway Drainage Layer North American Green-Erosion Control Geopier- Rammed Aggregate Piers/SRT Marine- Mattresses for scour protection

3 Agenda Increase your awareness and knowledge of Tensar Geogrids and their value in engineering and construction applications Subgrade Stabilization (unpaved) Pavement Optimization(paved) Independent Testing involving Tensar Geogrids Cost Benefits

4 RoaDrain Geosynthetic Roadway Subsurface Drainage Layer

5 RoaDrain Commercial Overview Product Components Net Core (Triplaner) High compressive strength Triplanar Geonet Nonwoven Geotextile Void-Maintaining Structure

6 RoaDrain Commercial Overview Applications Drainage beneath PCC pavement

7 RoaDrain Commercial Overview Applications Drainage beneath PCC pavement Drainage beneath base course

8 RoaDrain Commercial Overview Applications Drainage beneath PCC pavement Drainage beneath base course Beneath frost-susceptible soils or where capillary rise is problematic

9 RoaDrain Performance Nonwoven geotextile offers separation and filtration Triplanar geonet core ensures a void-maintaining structure with high compressive strength. High compressive strength Triplanar Geonet Less geotextile intrusion Notes: 1. RD-5 tested at 5,000 psf, RD-7 tested at 15,000 psf (both at 2% gradient) 2. Flow rate at 2% gradient 3. Open graded base layer (OGBL)

10 Introduction to TriAx Geogrid A Revolution in Geogrid Technology

11 When It Comes to Pavement Design What do you need to know to design a roadway? What would your clients/municipalites/dots want to see in your designs? Cost Life/Durability Ease of Construction

12 If that is the case, would you specify a product in your design that : Saves Money in the Short Term and Long Term? Improves performance of Roadway or Subgrade? Involves minimal labor when added to the road design?

13 Subgrade Imporvement

14 An Extreme Problem

15 An Everyday Problem

16 The Solution Step 1 Place Tensar Geogrid Over Subgrade

17 The Solution Step 2 Place Fill Over Geogrid

18 Tensar Geogrids Provide Distributions of Traffic Loads

19 Subgrade Improvement Typical Solution 2-ft

20 Subgrade Improvement Tensar Geogrid Solution 1-ft TENSAR TriAx 160

21 The Problem

22 The Solution Firm Subgrade CBR > 3-5

23 Pavement Reinforcement Life Cycle Cost Savings Service Life Extension Reduced Initial Cost Reducing Pavement Components 50,000 ESAL s 100,000 ESAL s 50,000 ESAL s 50,000 ESAL s

24 How Exactly Does This Stuff Work?

25 Roadway Performance

26 TriAx Geogrid Mechanically Stabilized Layer

27 Geogrid Mechanisms

28 Mechanisms Improved Bearing Capacity Source: USACOE ETL

29 Improved Bearing Capacity Flexible Pavements Subgrade CBR = 3.0 Subgrade CBR = 3.0

30 Mechanisms Tensioned Membrane Effect Membrane tension Vertical Membrane support Source: USACOE ETL

31 Mechanisms Lateral Restraint Source: USACOE ETL

32 Product Development Mechanical Interlock

33 Mechanisms Differ for Application Types Subgrade Stabilization Pavement Optimization Bearing Capacity Tensioned Membrane Lateral Restraint Bearing Capacity

34 Box of Rocks Demonstration

35 Box of Rocks Demonstration

36 Box of Rocks Demonstration

37 Box of Rocks Demonstration

38 Confinement Aggregate Restraint

39 Geogrids Provide Separation in Many Cases

40 Numerous Studies 1984 University of Waterloo 1991 USACE Phase I Geotextile Lit. Review 1991 USACE Phase II Geogrid Lit. Review 1992 USACE Phase III Several Grids Tested 1992 USACE w/ University of Alaska 1994 FAA/U.S. DOT Engineering Brief No USACE Gravel Roads over Soft Soil 2001 USACE Expedient Road Construction over Soft Soils 2003 USACE TL

41 Relevant Proof through Research University of Illinois Champagne Urbana U.S. Army Corps of Engineers Engineering Research & Development Center (ERDC) Modified Triaxial Cell (Resilient Modulus) Testing Field Verification Studies

42 Manufacturing of Tensar Geogrid Extruded Single Layer Process

43 Introduction to TriAx Geogrid A Revolution in Geogrid Technology

44 Aggregate Confinement & Interlock Multidirectional Performance Mechanisms

45 Rib Profile BX Geogrid

46 Rib Profile TX Geogrid

47 Tensile Stiffness (MD) (TD)

48 Radial Stiffness Tensar Biaxial

49 Radial performance

50 2008/2009 ACOE Testing Vicksburg, MS Unreinforced BX1200 TX160 TXDEV

51 Small Scale Trafficking Performance TX130S

52 Unpaved Road Design Method Summary Subgrade Stabilization Giroud-Noiray AASHTO USACE ETL Mechanisms Tension Membrane Bearing Capacity, Interlock Bearing Capacity, Interlock Geosynthetic Considerations Geotextiles Geogrids (through BCR%) Geogrids, Geotextiles (for separation only) Year Released Input Required Axle loads, tire pressure, rut depth, distance between wheels, geotextile properties, subgrade strength Project location, subgrade subgrade strength, traffic levels, PSI, aggregate Mr, AASHTO tables and nomographs Subgrade strength, axle loads, axle passes Current Status Obsolete Obsolete Current Practice

53 Design Theory Giroud Han (2004) h = ( J ) CBR CBRsg r h 0.3 bc log N s f s 1 0.9e P 2 πr 2 r h N c f c CBR sg 1 r where: h = aggregate base thickness r = radius of tire contact area N = number of axle passes CBR bc = agg base CBR CBR sg = subgrade CBR P = Wheel load s = rut depth Tensile Strength? f s =factor equal to 75 mm rut depth N c =bearing capacity factor f c =factor between undrained cohesion and CBR of subgrade J = aperture stability modulus of geosynthetic

54 Geogrid Installation Roll Geogrid Over Prepared Subgrade Firm Subgrade CBR > 3-5

55 Geogrid Installation Cut Geogrid to Accommodate Obstructions

56 Geogrid Installation Back Dump and Spread Fill Material

57 Geogrid Installation Standard Compaction Methods Should Be Used for Reinforcement Applications

58 Case Study EOG Resources- 4 Mile Road 9.5 miles Clearfield, PA

59 Natural Gas Extraction Site EOG Resources

60 Natural Gas Extraction Site EOG Resources

61 Natural Gas Extraction Site EOG Resources

62 Natural Gas Extraction Site EOG Resources

63 Case Study Hunt Oil Long Level Road- Access Road Johnsonburg, PA

64 Natural Gas Extraction Site Hunt Oil

65 Natural Gas Extraction Site Hunt Oil

66 Natural Gas Extraction Site Hunt Oil

67 Natural Gas Extraction Site Hunt Oil

68 Natural Gas Extraction Site Hunt Oil

69 Case Study Norht Hopewell Township 4 miles of Unpaved Township Roads North Hopewell (York County), PA

70 North Hopewell Unpaved Roads

71 North Hopewell Unpaved Roads

72 North Hopewell Unpaved Roads

73 Rex Energy Ocel Well Pad Carrolton, OH

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79 Tensar Tools for Cost Savings SpectraPave 4 software Dimension Foundation Design Program Carbon Footprint Reduction Program

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81 Questions? THANK YOU