CPT-based Liquefaction Research Articles

Liquefaction Susceptibility Evaluation for the City of Evansville, Indiana

A series of Standard Penetration Tests (SPT) were performed to delineate potentially liquefiable deposits in Evansville, Indiana. Cone Penetration Testing (CPT) were performed in areas where SPT soundings indicated liquefaction-prone material. Two SPT-based and two CPT-based liquefaction evaluation procedures were evaluated. A fifth method, called the Liquefaction Potential Index, is utilized to provide more quantitative assessment regarding liquefaction risk resulting from the postulated earthquakes. At 27 different locations, over 100 soil layers were investigated for liquefaction susceptibility. Concern exists for two postulated earthquakes: one a major earthquake generated in the Wabash Valley fault zone and the other a catastrophic earthquake with an epicenter in the central New Madrid seismic zone.

Evaluation of CPT-based liquefaction assessment method using cyclic triaxial test : Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7–11 December 1987V2, P7.37–7.48. Publ Bangkok: Southeast Asian Geotechnical Society, 1987

Evaluation of CPT-based liquefaction assessment method using cyclic triaxial test : Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7–11 December 1987V2, P7.37–7.48. Publ Bangkok: Southeast Asian Geotechnical Society, 1987

Evaluation of Liquefaction Potentials of Soils Using Cone Penetration Tests

A review of field liquefaction behavior during several recent earthquakes was made with emphasis on the Cone Penetration Test (CPT) qc-values and the grain size of the soils. The field correlation between the earthquake-induced cyclic stress ratio and normalized cone resistance indicates that fine-grained soils with a mean grain size of D50<0.25mm have greater resistance to liquefaction than do clean sands (D50≥O.25mm) having the same qc-values. On the basis of this finding, we have developed a liquefaction assessment method for soils using the CPT. The normalized critical value of the CPT, (qc1)cr' which separates liquefiable from nonliquefiable conditions, is defined as a function both of the cyclic stress ratio, and the mean grain size of a soil. A simple chart showing variation in the critical CPT value, (qc)cr' with depth was developed for various earthquake magnitudes, maximum surface accelerations and ground water levels. Our proposed CPT-based liquefaction assessment method was evaluated by data on the known performance of soils in the field.