The effect of over-consolidation ratio on CPT resistance of sand

Yishan Tian; Aflizal Arafianto; Barry M. Lehane

Publication Title
The effect of over-consolidation ratio on CPT resistance of sand

Abstract

The tip resistance of a penetrometer in overconsolidated (OC) sand has been observed to be greater than that in a normally consolidated (NC) sand at the same density and stress level. While this increase in tip resistance (q_c) is typically attributed to greater in-situ lateral effective stress, relatively few investigations of factors controlling penetrometer resistance in OC sand have been reported. This paper examines the influence of OCR on q_c measurements by conducting CPTs in NC and OC sand samples. Experimental data collected in sands with different OCRs and under various loading conditions are examined. It is shown that, while in-situ lateral stress ('_h) is an important determinant for q_c, there is not a unique relationship between q_c, '_h and sand relative density (D_r) for all relative densities. This trend was verified in numerical simulations of cone penetration conducted using the Press-Replace Finite Element Method and the hardening soil constitutive model.

Authors
Yishan Tian; Aflizal Arafianto; Barry M. Lehane

Published In

11th International Conference on Physical Modelling in Geotechnics (ICPMG2026)

Theme

Session 2: Scaling laws and fundamentals