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LOAD SETTLEMENT BEHAVIOUR OF JUTE GEOTEXTILE REINFORCED SUBGRADE OF RURAL ROAD USING ABAQUS

LOAD SETTLEMENT BEHAVIOUR OF JUTE GEOTEXTILE REINFORCED SUBGRADE OF RURAL ROAD USING ABAQUS. Sudip K. Roy Ambarish Ghosh Ashis Kumar Bera Sandip Chakraborty. Bengal Engineering and Science University, Shibpur Howrah – 711103 June, 2013. Department of Civil Engineering.

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LOAD SETTLEMENT BEHAVIOUR OF JUTE GEOTEXTILE REINFORCED SUBGRADE OF RURAL ROAD USING ABAQUS

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  1. LOAD SETTLEMENT BEHAVIOUR OF JUTE GEOTEXTILE REINFORCED SUBGRADE OF RURAL ROAD USING ABAQUS Sudip K. Roy AmbarishGhosh Ashis Kumar Bera SandipChakraborty Bengal Engineering and Science University, Shibpur Howrah – 711103 June, 2013 • Department of Civil Engineering

  2. Why Numerical Analysis?

  3. SELECTION OF NUMERICAL TOOL

  4. LITERATURE REVIEW

  5. LITERATURE REVIEW

  6. LITERATURE REVIEW

  7. ABAQUS • A Finite element Software • Robustness in numerical solution strategy for soil nonlinearity, • Capable of solving most geotechnical problems, • Involving two- and three-dimensional configurations, • Soil and structural elements, • Wide range of material property can be used • Total and effective stress analysis, • Consolidation analysis, • Seepage analysis, • Static and dynamic analysis, etc.

  8. ABAQUS • Huang et al. (2006) carried out finite element analysis to study the consolidation behaviour of an embankment on soft ground. • Hadi and Bodhinayake (2003) carried out finite element analysis of road emabankment in ABAQUS. • Kuo and Chou (2004) developed and analyzed a three dimensional model for flexible pavement using ABAQUS software

  9. Jute Geotextile Application • Bera et al. ( 2009 ) carried out series of unconfined compression strength tests of fly ash reinforced with jute geotextile. • Chattopadhyay and Chakraborty ( 2009 ) studied the application of JGT as facilitator in drainage. • Sahu et al. ( 2004 ) carried out model footing test to determine the behaviour of JGT reinforced soil bed and to asses aging effect of soil along with degradation of JGT with time

  10. Rajar hat Test Track • A trial stretch road section: • Data Given: • CBR=3% (assumed) • ESAL=60000 to 100000 • Unreinforced Road Section • As per IRC: SP: 72-2007, Subgrade Strength as per CBR=3%; it is Poor. • Premix Carpet = 20 mm • WBM (Grade-II) = 75 mm • WBM (Grade-III) = 100 mm • GSB(Grade-II) =150 mm Fig.1 Unreinforced Road Section

  11. Rajar hat Test Track Fig.2 Unreinforced Road Section ( Reduced GSB )

  12. Rajar hat Test Track Fig 3.Reinforced Road Section with JGT (20kN/m)

  13. Rajar hat Test Track Fig 4.Reinforced Road Section JGT (25kN/m)

  14. Rajar hat Test Track Fig 5.Reinforced Road Section with Geosynthetics

  15. Problem Description • Unreinforced road section • Unreinforced Road Section ( Reduced GSB ) • Reinforced Road Section with JGT (20kN/m)

  16. Geometry of the Model Fig.6 Unreinforced road section (UR GSB 100 )

  17. Geometry of the Model Fig.7Unreinforced road section (UR GSB 175 )

  18. Geometry of the Model Fig.8 JGT ( 20kN/M ) Reinforced road section (GSB 100 )

  19. Material property

  20. LOAD Static Load & Boundary Condition Fig. 9 Load and Boundary condition applied to the model (Reinforced section, JGT100)

  21. LOAD Cyclic load and Time Stepping

  22. INTERACTION

  23. Meshing Criteria ( a ) UR GSB 100 ( b )REINFORCED Fig.10 Mesh model

  24. Results and Discussions Deformed Shape Fig.11 Deformed shape for UR GSB 100

  25. Results and Discussions Deformed Shape Fig.12Deformed shape for UR GSB 175

  26. Results and Discussions Deformed Shape Fig.13 Deformed shape for JGT Reinforced Section

  27. Results and Discussions Deformed Shape JGT Fig.14 Deformed shape for JGT Reinforced Section

  28. Results and Discussions Deformed Shape Fig.15 Deformed and Undeformed shape for JGT Reinforced Section

  29. Results and Discussions Fig.16 Tensile stress ( ) & Compressive stress ()

  30. Results and Discussions Fig.17 Typical Load settlement plot at subgrade unreinforced ( UR GSB 100 ) road section ( by using cyclic loading)

  31. Results and Discussions Fig.18 Typical Load settlement plot at subgrade Reinforced road section ( Cyclic loading )

  32. Results and Discussions Effect of JGT on rut depth of road section Fig.19Load (Static) vs. Rut depth (mm)

  33. Results and Discussions Effect of JGT on rut depth of road section Fig.20 Rut depth (mm) for the three models ( Subgrade top )

  34. Results and Discussions Effect of JGT on rut depth of road section Fig.21 Comparison between rut depth for unreinforced ( URGSB 100 ) and reinforced model after 8 hours vehicle movement at an interval of 45 second

  35. Results and discussions Effect of JGT on stresses developed of Subgrade top

  36. Conclusions • With the introduction of JGT reinforcement in between subgrade and granular base layer the values of rut depth decreases significantly. • Cyclic loading developed larger rut depth compared to static loading irrespective of types of road section. • Stress developed on the subgrade top in case of JGT reinforced road section is much lesser than road section without reinforcement. • ABAQUS software can effectively analyse the any types of road sections ( Reinforced & Unreinforced ). By using this software researcher may observe any types of load ( compressive/ tensile ), directions, deformations at any point.

  37. References • Bera, A.K., Chandra, S.N., and Ghosh, A. ( 2009 ) “ Unconfined compressive strength of fly ash reinforced with jute geotextiles”, Geotextiles and Geomembranes, 27 ( 5 ), pp. 391-398. • Bhasi.A. Rajagopal, K.(2010) “Finite Element Analysis of Geosynthetic reinforced pile supported embankments.” SIMULIA Customer Conference. • Chattopadhyay, B.C., and Chakraborty, S. ( 2009 ) “ Application of jute geotextiles as facilitator in drainage”, Geotextiles and Geomembranes, 27 ( 2 ), pp. 156-161. • Hadi,N.S. and Mukammad. Bodhinayake, B.C. (2003) “Non-linear finite element analysis of flexible pavements” Elsevier, Advances in Engineering Software , 34, pp.657–662. • Helwany, S. Dyer, J. and Leidy, J. (1998) “Finite element analysis of flexible pavement.” , Journal of transportation engineering, September/October, pp.491- 499. • Helwany,S.(2007) “Applied soil mechanics with Abaqus application”, John Wiley & Sons. • Kuo, C.M, Chou, F.J. (2004). “Development of 3-D Finite Element model for Flexible Pavements” Journal of the Chinese Institute of Engineers, 27, ( 5 ), 707-717. • Sahu, R.B., Hazra, A.K.andSom, N. ( 2004 ) “ Behaviour of geojute reinforced soil bed under repetitive loading- a model study” BCC iInternational Conference on Geosynthetics and Geoenvironment Engineering, Bombay

  38. Thank You

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