2014_EJRNL_PP_Jidong_Zhao_1.pdf
Terbatas Irwan Sofiyan
» ITB
Terbatas Irwan Sofiyan
» ITB
This paper presents a micromechanical study on the behavior of granular materials
under confined shear using a three-dimensional Discrete Element Method (DEM). We consider
rotational resistance among spherical particles in the DEMcode as an approximate way to account
for the effect of particle shape. Under undrained shear, it is found rotational resistance may help to
increase the shear strength of a granular system and to enhance its resistance to liquefaction. The
evolution of internal structure and anisotropy in granular systems with different initial conditions
depict a clear bimodal character which distinguishes two contact subnetworks. In the presence of
rotational resistance, a good correlation is found between an analytical stress-force-fabric relation
and the DEM results, in which the normal force anisotropy plays a dominant role. The unique
properties of critical state and liquefaction state in relation to granular anisotropy are also explored
and discussed.