INVESTIGATION OF GROUND SHOCK EFFECTS IN NONLINEAR HYSTERETIC MEDIA. REPORT 1. DEVELOPMENT OF MATHEMATICAL MATERIAL MODELS
WEIDLINGER ASSOCIATES NEW YORK
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A historical outline of mathematical models used previously to represent soil and rock behavior in ground shock computations at low pressure levels is presented. The problems and deficiencies of these early approaches are discussed. Subsequently, two types of models are developed one a plastic model in which the yield condition depends on the mean stress and in which different variable bulk moduli are used in loading and unloading. The second type of model, called the variable bulk moduli model, has variable shear as well as moduli, but no explicit yield condition. The behavior of both types of model in uniaxial strain and triaxial compression tests is examined.
- Soil Mechanics