Rg. Wan et Pj. Guo, A SIMPLE CONSTITUTIVE MODEL FOR GRANULAR SOILS - MODIFIED STRESS-DILATANCY APPROACH, Computers and geotechnics, 22(2), 1998, pp. 109-133
The dependencies of granular soil behaviour on void ratio and stress a
re modelled within plasticity theory enriched by a modified stress-dil
atancy law. Simplicity has been kept in the development of the constit
utive law for easy future implementation in a finite element code. By
using a void ratio dependent factor which measures the deviation of th
e current void ratio from the critical one, Rowe's stress dilatancy eq
uation is modified This modification indeed corresponds to a new energ
y dissipation equation for a granular assembly which sustains kinemati
cal constraints under the action of stresses. The proposed constitutiv
e law predicts in a very consistent manner the response of sands in mo
notonic loading conditions,for a large range of initial void ratios an
d confining pressures without the need to make any adjustments to the
material parameters. Well known published data for the drained triaxia
l compression of Sacramento River sand was successfully modelled. (C)
1998 Elsevier Science Ltd. All rights reserved.