TY - JOUR ID - 1845 TI - INFLUENCE OF THE SCALE EFFECT ON THE MECHANICAL PARAMETERS OF COARSE-GRAINED SOILS JO - Iranian Journal of Science and Technology Transactions of Civil Engineering JA - IJSTC LA - en SN - 2228-6160 Y1 - 2014 PY - 2014 VL - 38 IS - C1 SP - 75 EP - 84 KW - Oedometer test KW - Scale effect KW - scale method KW - nominal maximum particle size KW - IgA DO - 10.22099/ijstc.2014.1845 N2 - The mechanical parameters of coarse-grained soils are often obtained via indoor orfield tests. In these tests, it is necessary to reduce the particle size of the original graded soils dueto the size limitation of the testing apparatus. Therefore, several scale methods (e.g., the equivalentsubstitute method and parallel gradation method) have been proposed to reduce the size of theoriginal graded soils to the proper testing size. However, the mechanical parameters will bedifferent if different scale methods are adopted, a phenomenon that has been termed the “scaleeffect”. In this research, a group of large-scale oedometer tests were conducted with specimensthat were downsized using different scale methods. The results show that (1) when adopting thesame scale methods, the compression modulus increases with the increase in the nominalmaximum particle size. (2) For the same nominal maximum particle size, samples that aredownsized using the equivalent substitute method have a higher compression modulus and degreeof particle breakage than those adopting the parallel gradation method. (3) Then Duncan-Chang EBmodel parameters were back calculated from oedometer tests using an immune geneticalgorithm (IGA). These mechanical parameters were also used in a three-dimensional (3D) finiteelement method analysis of the Pankou Rock-fill Dam. The manner in which the scale methodinfluences rock-fill dam deformation is also discussed. UR - https://ijstc.shirazu.ac.ir/article_1845.html L1 - https://ijstc.shirazu.ac.ir/article_1845_765899b6bbab8d30ac8c00497fb243d5.pdf ER -