Influence of SPT (Standard Penetration Test) Procedures in Soil Liquefaction Resistance Evaluations

摘要

This report attempts to clarify the meaning of the values of standard penetration resistance used in correlations of field observations of soil liquefaction with values measured in the Standard Penetration Test (SPT) tests. The field data is re-interpreted and plotted in terms of a newly-recommended standard determined in SPT tests. Energies associated with different methods of performing SPT tests in different countries and with different equipment are summarized and can readily be used to convert any measured N-value to the standard value. Liquefaction resistance curves for sands with different N-values and with different fines contents are proposed; these are believed to be more reliable than previous curves expressed in terms of mean grain size. Finally, suggestions are made concerning the significance of the term 'liquefaction'.