VARIATIONS IN STRENGTH AND ELASTIC PROPERTIES OF COMPACTED FINE-GRAINED SOILS DUE TO CHANGE IN DEGREE OF SATURATION

sarah Abdul Abbas Ibrahim; Basil Obaid  Mahdi

doi:10.30572/2018/KJE/160325

Authors

sarah Abdul Abbas Ibrahim Civil Engineering Department, University of Babylon, Babylon, Iraq https://orcid.org/0009-0000-1545-2323
Basil Obaid Mahdi Civil Engineering Department, University of Babylon, Babylon, Iraq

DOI:

https://doi.org/10.30572/2018/KJE/160325

Keywords:

degree of saturation, modulus of elasticity, shear strength, fine grained soil, unconfined compression test

Abstract

Fine-grained soils present challenges in construction due to their moisture sensitivity, which impacts the structure's stability. This study examines how saturation levels affect low-plasticity clay shear strength and modulus of elasticity. The standard proctor test assessed soil compaction for maximum dry density and water content. Unconfined compression tests determined the initial tangent modulus of elasticity, strain at failure, and undrained shear strength (Cu). Approach A: Soil samples are saturated by 20% gradually. Approach B: prepares samples at 100% saturation and gradually decreases them by 10% to achieve saturation levels. Results indicated saturation greatly affects Cu, modulus of elasticity, and strain at failure. Approach A reduces Cu gradually (18%) as saturation increases, but approach B reduces (67%) it sharply, especially at low saturation. Higher saturation increases strain at failure, exhibiting plasticity. Both approaches decrease modulus of elasticity as saturation increases. Undrained shear strength was higher in approach B specimens than in approach A

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