Effect of Lateral Stress on CPT Penetration Pore Pressures

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Excess pore pressures measured during cone penetration are often correlated with the characteristics and stress history of fine-grained soil deposits. Recent research with sands in calibration chambers shows that the horizontal effective stress is a major factor controlling soil response to penetration of full displacement probes. Using the distribution of excess pore pressure around a penetrating cone, a pore pressure difference parameter, normalized with the effective vertical stress, is defined and a correlation with K0 is suggested. The interdependence of the suggested parameter (PPSV) and K0 is evaluated using published field data from 15 sites. The normalized pore pressure gradient around the cone appears to be linearly related to K0 although a global relationship is precluded by the scatter in the data. The results, however, appear promising and suggest that large strain parameters can be correlated to the in situ stress in the ground.