Chapter

Experimental Unsaturated Soil Mechanics

Volume 112 of the series Springer Proceedings in Physics pp 277-284

Experimental Study on Shrinkage Behaviour and Prediction of Shrinkage Magnitudes of Residual Soils

  • Sarita DhawanAffiliated withDepartment of Civil Engineering, Indian Institute of Science
  • , Anil Kumar MishraAffiliated withDepartment of Bio-production and Environmental Sciences, Faculty of Agriculture, Kyushu University
  • , Sudhakar M. RaoAffiliated withDepartment of Civil Engineering, Indian Institute of Science

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Summary

The present study examines the shrinkage behaviour of residually derived black cotton (BC) soil and red soil compacted specimens that were subjected to air-drying from the swollen state. The soil specimens were compacted at varying dry density and moisture contents to simulate varied field conditions. The void ratio and moisture content of the swollen specimens were monitored during the drying process and relationship between them is analyzed. Shrinkage is represented as reduction in void ratio with decrease in water content of soil specimens. It is found to occur in three distinct stages. Total shrinkage magnitude depends on the type of clay mineral present. Variation in compaction conditions effect marginally total shrinkage magnitudes of BC soil specimens but have relatively more effect on red soil specimens. A linear relation is obtained between total shrinkage magnitude and volumetric water content of soil specimens in swollen state and can be used to predict the shrinkage magnitude of soils.

Key Words

residual soils clay mineralogy compaction conditions shrinkage prediction volumetric water content