岩土工程学报2019，Vol.41Issue(2)：255-261,7.DOI:10.11779/CJGE201902002
基于超大型三轴仪的堆石料缩尺效应研究
Scale effect of rockfill materials using super-large triaxial tests
摘要
Abstract
A super-large triaxial apparatus and a common large triaxial apparatus are used to conduct triaxial tests on quarried rockfill materials with the maximum particle size dmax of 200 and 60 mm in parallel gradation.The study mainly focuses on the effect of particle size on the stress-strain relation, particle breakage, characteristic stress state and parameters of Duncan-Chang model.The results show that the peak friction angle of dmax=60 mm is higher than that of the dmax=200 mm, and the axial stain at the peak strength of dmax=60 mm is smaller than that at dmax=200 mm.The phase transformation stress ratio of dmax=60 mm is higher than that at dmax=200 mm, and the volumetric and axial strains in phase transformation state are smaller than those at dmax=200 mm.The amount of particle breakage of dmax=200 mm is greater than that at dmax=60 mm.The secant elastic and bulk moduli at 50％ stress level of dmax=60 mm are larger than those at dmax=200 mm.The parameters k and kb of Duncan-Changmodel for dmax=60 mm are 1.22 and 1.38 times those for dmax=200 mm, respectively.This study may provide valuable experimental references for the constitutive model considering scale effect and the deformation analysis for rockfill structures.关键词
堆石料/超大三轴/缩尺效应/最大粒径/颗粒破碎Key words
rockfill material/super-large triaixal test/scale effect/maximum particle size discrete/particle breakage分类
建筑与水利引用本文复制引用
孔宪京,宁凡伟,刘京茂,邹德高,周晨光..基于超大型三轴仪的堆石料缩尺效应研究[J].岩土工程学报,2019,41(2):255-261,7.基金项目
国家重点研发计划项目(2017YFC0404902) （2017YFC0404902）
国家自然科学基金项目(51678113,51779034,51608095) （51678113,51779034,51608095）
中央高校基本科研业务费项目(DUT17ZD219) （DUT17ZD219）
