An Effective Stress Model for Ground Motion Calculations
Final rept. Oct 1977-Jun 1979
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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This report documents the development of a three-dimensional, elastic-plastic, work-hardening constitutive model based on the theory of effective intergranular stress for the purpose of simulating the response of isotropic three-phase partially saturated earth materials. This model can be used to perform effective stress ground shock analyses. The model is actually a marriage of two single-phase elastic-plastic models which simulate, respectively, the drained and undrained stress-strain behavior of earth media, and whose coefficients can all be determined experimentally using conventional laboratory testing techniques. Fitting the model, therefore, requires an extra set of laboratory tests the drained tests over that required to fit a contemporary total stress ground shock model. The feasibility of using the new model for effective stress ground shock analyses is demonstrated numerically by solving a simplified two-dimensional airslap problem for a saturated sand halfspace using an effective stress version of the LAYER code. The real power of this computational tool has yet to be investigated by applications against actual field experiments. Appendix A reviews the fundamentals of elastic-plastic models.
- Test Facilities, Equipment and Methods