Cyclic Direct Simple Shear tests - Effect of static shear stress

The stress-strain-strength behavior of Ottawa F-65 sand is investigated through a series of stress-controlled Cyclic Direct Simple Shear (CDSS) tests conducted as part of the Liquefaction Experiments and Analysis Project (LEAP-2022). The tests were performed with two different overburden stresses on specimens prepared with different relative densities and subjected to different static (initial) shear stresses prior to cyclic shearing. The report included here presents the setup and experimental procedure, as well as the liquefaction strength curves and the results obtained from each test. The dataset presented in this report builds on the soil characterization tests, cyclic triaxial tests, and direct simple shear tests performed for the LEAP-2017, LEAP-2018/9, and LEAP-2020 (ElGhoraiby, Park and Manzari, 2017, 2018a, b, 2020). The current dataset is archived on DesignSafe-CI and a MATLAB script is also provided for post-processing and visualization of the experimental data.