Implementation of DSC model and application for analysis of field pile tests under cyclic loading

• Published in: International journal for numerical and analytical methods in geomechanics Vol. 24; no. 6; pp. 601 - 624
• Main Authors: Shao, Changming, Desai, Chandra S.
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01-05-2000; Wiley
• Subjects: Applied sciences; Buildings. Public works; Computation methods. Tables. Charts; constitutive model; cyclic loading; disturbed state concept; Exact sciences and technology; field validation; finite element method; Geotechnics; soil-structure interaction; Structural analysis. Stresses; Structure-soil interaction; Constitutive equation; Shear test; Dynamic response; Experimental test; Stress strain relation; Clay soil; Triaxial test; Porous material; Young modulus; Finite element method; Pore pressure; Cyclic load; Pile; Numerical simulation; Structure soil interaction; Loading test(mechanics)
• ISSN: 0363-9061; 1096-9853
• DOI: 10.1002/(SICI)1096-9853(200005)24:6<601::AID-NAG85>3.0.CO;2-3

The disturbed state concept (DSC) model, and a new and simplified procedure for unloading and reloading behavior are implemented in a nonlinear finite element procedure for dynamic analysis for coupled response of saturated porous materials. The DSC model is used to characterize the cyclic behavior of saturated clays and clay–steel interfaces. In the DSC, the relative intact (RI) behavior is characterized by using the hierarchical single surface (HISS) plasticity model; and the fully adjusted (FA) behavior is modeled by using the critical state concept. The DSC model is validated with respect to laboratory triaxial tests for clay and shear tests for clay‐steel interfaces. The computer procedure is used to predict field behavior of an instrumented pile subjected to cyclic loading. The predictions provide very good correlation with the field data. They also yield improved results compared to those from a HISS model with anisotropic hardening, partly because the DSC model allows for degradation or softening and interface response. Copyright © 2000 John Wiley & Sons, Ltd.