Cone penetration tests in saturated and unsaturated silty tailings

Adrian R. Russell, Thanh Vo, Juan Ayala, Yanzhi Wang, David Reid, Andy B. Fourie

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Laboratory-controlled cone penetration test results for two silty tailings in a variety of saturated and unsaturated states, obtained using two calibration chambers, are presented then interpreted using a state parameter-based approach. For each the cone penetration resistances, which increase due to the presence of suction when the tailings are unsaturated, can be normalised using the initial mean effective stress to establish a relationship with the initial state parameter. The relationship is applicable to saturated and unsaturated conditions, as long as the presence of suction hardening as well as the influence of suction on the mean effective stress are accounted for, and as long as the cone penetrations occur under drained conditions. The relationships enable state parameters to be back-calculated from normalised cone penetration resistances. The state parameters enable estimations of the tailings' peak friction angles for drained loadings as well their propensities to liquefy during undrained loadings. Application is demonstrated using CPT soundings in tailings storages from which the samples were taken, showing how in situ void ratios and state parameters, and future state parameters if the tailings were to become saturated, can be determined. Close agreements with direct measurements of void ratios are shown.

Original languageEnglish
Pages (from-to)281-295
Number of pages15
JournalGeotechnique
Volume74
Issue number3
Early online date14 Jun 2022
DOIs
Publication statusPublished - 14 Jun 2022

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