Validation of Lade's Failure Criteria at Overconsolidated General Stress States

摘要

Several geotechnical engineering constructions subject the soil to a partial stress reduction. In addition, in practice, often both axisymmetric and nonaxisymmetric conditions can apply in different locations in the ground affected by the construction. In general, the corresponding stress states at failure will be, therefore, overconsolidated and cover a wide domain of the space of the principal stresses. However, the classic failure criteria typically fail to reproduce the observed failure envelope in wide range of stresses. In this note, the original and modified Lade's criteria are validated and compared against recent data on Pisa clay at general overconsolidated stress states, in compression and extension. A generalization of the modified Lade's criterion at overconsolidated clays is also proposed.