砂質地盤の液状化と静的コーン貫入抵抗

Abstract

A review of field performance of sandy soil deposits during past earthquakes is conductedwith emphasis being placed on Static Cone Penetration Test qc-values and fines content.The field relationship between dynamic shear stress ratio and qc1-values (qc normalized foreffective overburden pressure of 1.0 kgf/cm2) indicate that (1) sands containing more than15% fines, or having smaller mean grain size than 0.25 mm, show much greater resistanceto liquefaction than clean sands which have the same qc-values, (2) extensive damage wouldnot occur for clean sands with qc1-values greater than about 150 kgf/cm2. On the basis ofthese findings, an empirical relationship separating liquefiable and non-liquefiable conditionsis presented in terms of dynamic shear stress ratio, qc1-values, and fines content.