Abstract: The stress history of soil reflects the evolution of effective stress in natural soils in the geological history. The evaluation of the stress history of the soil is an important aspect in the geotechnical engineering investigation. This paper presents the insitu evaluation of overconsolidation ratio (OCR) in sandy soils. In particular the correlation between the OCR values and the compression modulus from the flat dilatometer testing (DMT) as well as the tip resistance ratio from cone penetrometer testing (CPT) are2 established. The case history shows that the empirical relationship using the singlet parameter KD is not applicable to all sandy soils, but the overconsolidation ratio established from the ratio multi parameters are more applicable in different soil types.

Key words: Flat Dilatometer Test, Cone Penetration Test, Over-Consolidation Ratio, Stress History, Sandy Soils