Estimation and Separation of Preconsolidation Stress Using Triaxial,- and Oedometer Test in Kiscelli Clay

The study is about the estimation of preconsolidation stress using a correlation method. Disturbance of soil samples can result in the yield point of void ratio-log vertical stress data from oedometer test being unreadable. Therefore, correlations were calculated to estimate preconsolidation stress using effective vertical stress (σ′v0), oedometer modulus (Eoed) from oedometer tests and unloading-reloading modulus (Eur) from triaxial tests. Profile of stress history: Overconsolidation ratio (OCR), overconsolidation difference (OCD) and overconsolidation gradient (OCG) were determined in Kiscelli Clay based on new equations. An additional new parameter, ratio of mechanical preloading component of overconsolidation is defined and analysed