Experimental investigation of influence of soil plasticity on compression characteristics and creep behaviour of clayey soils




Experimental investigation of influence of soil plasticity on compression characteristics and creep behaviour of clayey soils


Comprehending the creep mechanisms and determining the factors influencing compression and creep characteristics is indispensable for accurate long-term settlement predictions, a critical determinant of structural stability and safety of structures. Also, both natural and artificial slopes, as well as embankments, manifest varying rates of creep movements. Recent experimental investigations have highlighted the significant role played by the influence of soil composition, fabric structure, over-consolidation ratio (OCR), and plasticity in the time-dependent behaviour and compression characteristics of clays. However, a comprehensive description and correlation of these factors have yet to be proposed. To address this gap, an extensive experimental study was conducted under well-defined conditions. Reconstituted samples, including low-plasticity clay (kaolinite), high-plasticity clay (bentonite), and their mixtures, underwent standard and creep oedometric tests. We show that samples with lower plasticity exhibit reduced volume changes during compression and swelling and lower values of the creep coefficient (Cα). The stress dependency of Cα is more pronounced in mixtures containing bentonite compared to pure kaolinite. Also, strong OCR-dependency of Cα has been observed.

M. N. Duy; J. Jerman


18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)



B - Geohazards