Model predictions for behaviors of sand-nonplastic-fines mixtures using equivalent-skeleton void-ratio state index

作     者：XIAO Yang SUN YiFei LIU HanLong XIANG Jia MA QiFeng LONG LeiHang 

作者机构：Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing University Chongqing 400045 China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing 400030 China School of Civil Engineering Chongqing University Chongqing 400045 China Faculty of Engineering and Information Sciences University of Wollongong Wollongong 2522 Australia 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2017年第60卷第6期

页      面：878-892页

核心收录：

学科分类：081401[工学-岩土工程] 08[工学] 0814[工学-土木工程] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 51509024 and 51678094) the Fundamental Research Funds for the Central Universities (Grant No. 106112015CDJXY200008) the Project funded by China Postdoctoral Science Foundation (Grant No. 2016M590864) 

主　　题：sand fines equivalent skeleton void ratio critical state strength dilatancy constitutive model 

摘      要：It is a challenge to suggest a constitutive model for describing the stress-strain behavior of sand-fines mixtures due to that these granular mixtures exhibited very complex behaviors at different densities, pressures and fines contents. In this study, an elastoplastic constitutive model within the framework of the bounding surface plasticity and critical state theories was proposed for sand-nonplastic-fines mixtures by using the concept of the equivalent-skeleton void ratio and equivalent-skeleton void-ratio state index. The proposed model with a set of material constants calibrated from a few tests could be used to model the fines-dependent and state-dependent behaviors of the sand-nonplastic-fines mixture including the strain- softening and volumetric-expansion behaviors in the drained triaxial compression tests, and also the effects of fines content on the critical state lines in both the deviatoric stress versus mean effective stress and the void ratio versus mean effective stress planes.