Evaluation of cyclic resistance of providence silts using mini-cone penetration and standard penetration tests.
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Evaluation of cyclic resistance of providence silts using mini-cone penetration and standard penetration tests.

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  • English

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    • Abstract:
      Most areas of coastal Rhode Island are underlain by thick layers of non-plastic silt and it is important to

      know if the existing standard-of-practice liquefaction potential evaluations (e.g. Robertson and Wride (1998) or

      Seed et al. (1985)) are accurate. The objective of this research was to critically evaluate the applicability of CPT

      and SPT based approaches to Providence silts. This was accomplished through a laboratory testing program

      involving the URI mini-cone calibration chamber and cyclic triaxial tests to develop a new relationship between

      cyclic resistance ratio and tip resistance for Providence silt. The new relationship was compared to the standard-ofpractice

      liquefaction potential evaluation methods from the literature. There was good agreement between the

      approaches which shows that the existing field-based CPT methods are applicable to Rhode Island silts. This is

      consistent with previous RIDOT funded research on the liquefaction potential evaluation of silts in Rhode Island

      (Bradshaw et al. 2007; 2007a; Baxter et al. 2008).

      An attempt was also made to evaluate SPT-based approaches in silt using the mini-cone and laboratory

      cyclic data. A qc/N60 correlation was evaluated from two loose silt sites in Rhode Island where SPT and CPTs

      were performed adjacent to each other. The agreement between blow counts and tip resistance was very poor, most

      likely due to the small number of tests and small range of in situ densities. Because of the poor agreement, it was

      not possible to directly evaluate the SPT-based liquefaction evaluation approaches in the study.

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