A unified method to predict diffuse and localized instabilities in sands

Sun, WaiChing

A simplified method to analyse diffuse and localized bifurcations of sand under drained and undrained conditions is presented in this paper. This method utilizes results from bifurcation analysis and critical state plasticity theory to detect the onset of pure and dilatant shear band formation, static liquefaction and drained shear failures systematically. To capture the soil collapse observed in experiments, the instability state line concept originated by Chu, Lo and Lee in 1993 is adopted. Emphasis is given to examine how the presence of pore-fluid may facilitate or delay instability after yielding occurs. The predictions of instabilities are compared with experimental data from triaxial compression tests on Toyoura and Changi sands.


Also Published In

Geomechanics and Geoengineering: An International Journal

More About This Work

Academic Units
Civil Engineering and Engineering Mechanics
Published Here
March 19, 2014