NUMERICAL SIMULATION OF STRENGTH AND DEFORMATION CHARACTERS OF ROCKFILL
CAI Zhengyin1，DING Shuyun1，BI Qingtao2
(1. Department of Geotechnical Engineering，Nanjing Hydraulic Research Institute，Nanjing，Jiangsu 210024，China； 2. Institute of Geotechnical Engineering，Hohai University，Nanjing，Jiangsu 210098，China)
Abstract：The results from large-scale triaxial test show that rockfill will exhibit strain softening response and dilative behavior during shear process. Whether it will happen depends on the density of the material and its stress state. The lower the effective mean normal stress is，the larger the density is，and the more the strain softening and dilative response are. By introducing state-dependent dilatancy theory of cohesionless soils，a series of numerical simulations of the strength and deformation behaviors of saturated rockfill by triaxial consolidation and drainage test under different relative densities have been conducted. Compared with the simulation results of Duncan-Chang¢s E-B model and Nanshui model，it is found that the theory can reflect the strain softening and dilative characters of rockfill through a unique set of parameters for given materials over a full range of densities and stress levels.
