TY - GEN
T1 - Contact stiffness affecting discrete element modelling of unbound aggregate granular assemblies
AU - Huang, H.
AU - Tutumluer, E.
AU - Hashash, Y. M.A.
AU - Ghaboussi, J.
PY - 2008
Y1 - 2008
N2 - This paper describes a preliminary study undertaken at the University of Illinois to investigate the impact of contact stiffness properties on aggregate assembly strength. An aggregate particle imaging based Discrete Element Modeling (DEM) methodology was employed to study the effects of normal and shear contact stiffnesses. Using the results of laboratory direct shear box tests on actual aggregate samples, direct shear box DEM simulations were calibrated to identify the effects of different contact stiffness combinations. It was found that as the normal to shear contact stiffness ratio increased, the shear strength of the aggregate assembly also increased. Further, the same stiffness ratio captured the shear behaviour at three different normal stress levels thus validating the DEM simulation results.
AB - This paper describes a preliminary study undertaken at the University of Illinois to investigate the impact of contact stiffness properties on aggregate assembly strength. An aggregate particle imaging based Discrete Element Modeling (DEM) methodology was employed to study the effects of normal and shear contact stiffnesses. Using the results of laboratory direct shear box tests on actual aggregate samples, direct shear box DEM simulations were calibrated to identify the effects of different contact stiffness combinations. It was found that as the normal to shear contact stiffness ratio increased, the shear strength of the aggregate assembly also increased. Further, the same stiffness ratio captured the shear behaviour at three different normal stress levels thus validating the DEM simulation results.
UR - http://www.scopus.com/inward/record.url?scp=79952296634&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79952296634&partnerID=8YFLogxK
U2 - 10.1201/9780203885949.ch21
DO - 10.1201/9780203885949.ch21
M3 - Conference contribution
AN - SCOPUS:79952296634
SN - 9780415475907
T3 - Advances in Transportation Geotechnics - Proceedings of the 1st International Conference on Transportation Geotechnics
SP - 167
EP - 172
BT - Advances in Transportation Geotechnics - Proceedings of the 1st International Conference on Transportation Geotechnics
PB - CRC Press
ER -