TY - GEN
T1 - Discrete element modeling of aggregate behavior in fouled railroad ballast
AU - Huang, Hai
AU - Tutumluer, Erol
AU - Hashash, Youssef M.A.
AU - Ghaboussi, Jamshid
PY - 2009
Y1 - 2009
N2 - This paper describes an aggregate imaging based Discrete Element Modeling (DEM) methodology successfully employed to model both clean and coal dust fouled railroad ballast behavior. Laboratory direct shear box tests were conducted on granite type clean and fouled ballast aggregate samples. The size, shape and angularity properties of the aggregate particles were obtained through image analysis. Accordingly, direct shear box DEM simulations were conducted for different aggregate contact friction conditions. Both the clean ballast behavior and the heavily fouled case of coal dust filling completely all the voids in ballast were adequately modeled using the DEM approach by assigning a lower contact friction angle as the controlling discrete element model parameter in the latter case. In accordance with the direct shear test results, much lower shear stress-shear deformation curves, i.e., lower shear strengths, were predicted the coal dust fouled case using the DEM simulations. Copyright ASCE 2009.
AB - This paper describes an aggregate imaging based Discrete Element Modeling (DEM) methodology successfully employed to model both clean and coal dust fouled railroad ballast behavior. Laboratory direct shear box tests were conducted on granite type clean and fouled ballast aggregate samples. The size, shape and angularity properties of the aggregate particles were obtained through image analysis. Accordingly, direct shear box DEM simulations were conducted for different aggregate contact friction conditions. Both the clean ballast behavior and the heavily fouled case of coal dust filling completely all the voids in ballast were adequately modeled using the DEM approach by assigning a lower contact friction angle as the controlling discrete element model parameter in the latter case. In accordance with the direct shear test results, much lower shear stress-shear deformation curves, i.e., lower shear strengths, were predicted the coal dust fouled case using the DEM simulations. Copyright ASCE 2009.
UR - http://www.scopus.com/inward/record.url?scp=71649096423&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=71649096423&partnerID=8YFLogxK
U2 - 10.1061/41044(351)6
DO - 10.1061/41044(351)6
M3 - Conference contribution
AN - SCOPUS:71649096423
SN - 9780784410448
T3 - Geotechnical Special Publication
SP - 33
EP - 41
BT - Recent Advancement in Soil Behavior, In Situ Test Methods, Pile Foundations, and Tunneling
T2 - 2009 GeoHunan International Conference - Recent Advancement in Soil Behavior, In Situ Test Methods, Pile Foundations, and Tunneling
Y2 - 3 August 2009 through 6 August 2009
ER -