摘要
To characterize the constitutive behavior of granular aggregates, a non-associated plasticity model with two different yield and plastic potential surfaces was usually used. However, in this paper, a state-dependent fractional elastoplastic model is proposed by only perform- ing the first- and fractional-order differentiations of the yield function. The non-associated plastic flow is obtained without using any plastic potential functions. The state dependence is considered by correlating the fractional order with a state parameter. The model is then validated by simulating a series of test results of different granular aggregates, including sand, ballast and rockfill, under a variety of loading conditions.
To characterize the constitutive behavior of granular aggregates, a non-associated plasticity model with two different yield and plastic potential surfaces was usually used. However, in this paper, a state-dependent fractional elastoplastic model is proposed by only perform- ing the first- and fractional-order differentiations of the yield function. The non-associated plastic flow is obtained without using any plastic potential functions. The state dependence is considered by correlating the fractional order with a state parameter. The model is then validated by simulating a series of test results of different granular aggregates, including sand, ballast and rockfill, under a variety of loading conditions.
作者
Yifei Sun
Shunxiang Song
Yang Xiao
Jiancheng Zhang
Yifei Sun;Shunxiang Song;Yang Xiao;Jiancheng Zhang(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, College of Civil and Transportation Engineering, 1-Iohai University, Nanjing 210098, China;College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China;State Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Civil Engineering, Chongqing University, Chongqing 400450, China;School of Naval Architecture and Civil Engineering, Jiangsu University of Science and Technology, Jiangsu 215600, China)
基金
The financial support provided by the National Natural Science Foundation of China (grant no.41630638)
the National Key Basic Research Program of China (“973” Program) (grant no.2015CB057901)
the Fundamental Research Funds for the Central Universities (grant no.2017B05214)
the Priority Academic Program Development of Jiangsu Higher Education Institutions
