ASCE has honored the writing team of Steven L. Kramer, Ph.D., P.E., M.ASCE, and C.H. Wang with the 2017 Norman Medal for their paper, “Empirical Model for Estimation of the Residual Strength of Liquefied Soil,” Journal of Geotechnical and Geoenvironmental Engineering, September 2015.
The paper presents reviews of the physical processes that lead to liquefaction-induced permanent deformations, previous procedures for estimation of residual strength, and issues involved in the interpretation of case histories. It also develops a steady (critical) state-based framework that illustrates the effects of characteristics such as effective stress of the steady state strength. It then presents the results of back-analyses that account for uncertainties inherent in the flow-side case histories and presents an empirical model that predicts behavior consistent with both flow-side and lateral spreading case histories, with the steady (critical) state framework, and which allows probabilistic estimation of residual strength.
Kramer is professor in the Department of Civil and Environmental Engineering at the University of Washington. Wang is Asia Branch Manager at Geopier UK Limited, in Taiwan.
The Norman Medal is bestowed upon the author or authors of a paper that is judged worthy of special commendation for its merit as a contribution to engineering science.