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This lecture introduces the Modified Cam Clay Model, covering constitutive modeling in geomechanics, elasticity, plasticity, hardening elasto-plasticity, and critical state concepts. It explains the application of the model to a circular load on soft clay foundation, soil parameters, initial conditions, stress paths, pore pressure generation, and distinction between yielding and failure. The lecture also discusses the settlement calculations, elastic analysis, elasto-plastic settlements, and the applications of elasto-plastic models in geotechnical problems.