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Damage evolution and dynamic response of cement asphalt mortar layer of slab track under vehicle dynamic load

查看全文 作　　者：ZHU [1]ShengYang;FU [2]Qiang;CAI [1]ChengBiao;SPANOS Pol [3]D 高影响力作者 机构地区：[1]State Key Laboratory of Traction Power, Southwest Jiaotong University;[2]School of Civil Engineering, Central South University;[3]Ryon Chair in Engineering, Rice University高影响力机构 出　　处：《Science China(Technological Sciences)》索引2014年第57卷第10期,共12页高影响力期刊 基　　金：supported by the National Basic Research Program of China('973'Project)(Grant Nos.2013CB036202,2013CB036200);the National Natural Science Foundation of China(Grant No.51008254);the Funds from the Key Laboratory for Precision&Non-traditional Machining of the Ministry of Education,Dalian University of Technology(Grant No.JMTZ201002);the Fundamental Research Funds for the Central Universities(Grant No.2682013CX029);the Funds from the China Scholarship Council;the 2013 Cultivation Program for the Excellent Doctoral Dissertation of Southwest Jiaotong University 摘　　要：The damage evolution and dynamic performance of a cement asphalt(CA)mortar layer of slab track subjected to vehicle dynamic load is investigated in this paper.Initially,a statistical damage constitutive model for the CA mortar layer is developed using continuous damage mechanics and probability theory.In this model,the strength of the CA mortar elements is treated as a random variable,which follows the Weibull distribution.The inclusion of strain rate dependence affords considering its influence on the damage development and the transition between viscosity and elasticity.Comparisons with experimental data support the reliability of the model.A three-dimensional finite element(FE)model of a slab track is then created with the commercial software ABAQUS,where the devised model for the CA mortar is implemented as a user-defined material subroutine.Finally,a vertical vehicle model is coupled with the FE model of the slab track,through the wheel-rail contact forces,based on the nonlinear Hertzian contact theory.The evolution of the damage and of the dynamic performance of the CA mortar layer with various initial damage is investigated under the train and track interaction.The analysis indicates that the proposed model is capable of predicting the damage evolution of the CA mortar layer exposed to vehicle dynamic load.The dynamic compressive strain,the strain rate,and the induced damage increase significantly with an increase in the initial damage,whereas the dynamic compressive stress exhibits a sharp decrease with the increasing initial damage.Also,it is found that the strain rate dependence significantly influences the damage evolution and the dynamic behavior of the CA mortar layer. 关 键 词：损伤演化 板式轨道 车辆模型 砂浆层 动态响应 荷载作用 沥青 水泥
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