Advertisement

Influence of Swelling on Flexible Pavements: A Numerical Study

  • S. N. TharaEmail author
  • Anirban Mandal
  • Siva Ram Karumanchi
Conference paper
Part of the Lecture Notes in Civil Engineering book series (LNCE, volume 29)

Abstract

Expansive subgrades have long been recognised as problematic as they undergo considerable amount of volume changes due to moisture content fluctuations causing considerable distress to the pavement section above it thus making it important to estimate the changes in stresses and displacements in pavement layers. In the present research, swelling and shrinkage effects of expansive subgrade on flexible pavements are studied. Experimental program to find the basic properties of the soils were conducted first. Soil–water characteristic curves of the samples were developed and found to follow the traditional behaviour; soil suction increases as moisture content decreases. Database of soil properties was developed and was used as an input to estimate the stresses and displacements on pavement layers caused by swelling of subgrade using FEM-based software. For 0.8, 2 and 2.9 m water table depths, stresses and displacements were analysed. It was seen that in the swelling stage, water table at 2.9 m showed maximum upward deflection and in the loading stage for 0.8 m GWT, maximum compression was seen followed by 2, 2.9 m. It was inferred that with high ground water table, adequate base clearance should be maintained to minimise the moisture damage and to achieve quality performance of the pavement.

Keywords

Matric suction Swelling Expansive soils Stresses Displacements SWCC Ground water table 

References

  1. Bulut RLR (2001) Soil suction measurements by Filter paper. In: Proceedings of geo-institute shallow foundation and soil properties committee sessions at the ASCE 2001 Civil Eng Conference, pp. 243–261Google Scholar
  2. Erlingsson S (2013) The influence of groundwater level on the structural behaviour of a pavement structure using FWD. Sweden: pavement technology departmentGoogle Scholar
  3. Farouk A, Lamboj L, Kos J (2004) Influence of matric suction on the shear strength behaviour of unsaturated sand. Acta Polytechnica 7:44Google Scholar
  4. Fredlund DG (2012) Unsaturated soil mechanics in engineering practice. John Wiley & Sons Inc, New YorkCrossRefGoogle Scholar
  5. James M, Tinjum CH (1997) Soil water characteristic curves for compacted clays. J Geotech Geoenviron Eng, 123Google Scholar
  6. Nelson DJJD (1992) Expansive soils-problems and practice in foundation and pavement engineering. Int J Numer Anal Meth Geomech 17:745–756Google Scholar
  7. Nishimura T (2000) Relationship between shear strength and matric suction in an unsaturated silty soil. In: Asian conference on unsaturated soils, SingaporeGoogle Scholar
  8. Ping WBS (2012) The effect of ground water base clearance on constructability of Florida pavements. In: Ninth Asia Pacific transportation development conference, pp 591–598Google Scholar
  9. Shu-Rong Yang W-H (2005) Variation of Resilient modulus with soil suction for compacted subgrade. Transp Res Rec J Transp Res Board, 99–106Google Scholar
  10. Turki (2015) Loss in serviceability of pavements due to expansive subgrades. Environ Eng Geosci, 277–294Google Scholar
  11. Zhang LL, D. (2004) Numerical study of soil conditions under which matric suction can be maintained. Canadian Geotech J, 558–561Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • S. N. Thara
    • 1
    Email author
  • Anirban Mandal
    • 1
  • Siva Ram Karumanchi
    • 1
  1. 1.Department of Civil EngineeringNational Institute of Technology NagpurNagpurIndia

Personalised recommendations