An Expanded Data Set of Overburden (K) and Initial Static Shear Stress (K) Correction Factors from Published Cyclic Laboratory Tests for Liquefaction Triggering Analyses

Results from laboratory tests have shown that effective confining pressure and non-zero initial static shear stress can affect a soil's cyclic resistance ratio (CRR). To account for these effects, the factors K-sigma and K-alpha are used to modify the CRR, respectively. However, there is no consensus on the use of existing K-sigma and K-alpha models. To facilitate the validation of existing models and the development of new models, we compiled results from 63 published studies and organized them in a digital data set. The compiled data set contains 3,493 CSR vs. N (cyclic stress ratio vs. number of cycles) points, 960 CRR values, 231 K-sigma and 326 K-alpha values that span a wide range of soil type, relative density, initial stress, fines' content, and specimen preparation method. This data set greatly extends the amount of data available for evaluation and development of K-sigma and Ka models and is provided for use in next generation liquefaction (NGL) models.