轨道-路基参数对高速铁路路基动应力响应的影响  

Effects of track-subgrade parameters on the dynamic stress response in subgrade of high-speed railway

作　　者：李扬波[1] 张家生[1,2] 王晅[1] 毛国成 石熊[1] LI Yangbo;ZHANG Jiasheng;WANG Xuan;MAO Guocheng;SHI Xiong(School of Civil Engineering of Central South University,Changsha 410075,China;National Engineering Laboratory for High Speed Railway Construction,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中南大学高速铁路建造技术国家工程实验室,湖南长沙410075

出　　处：《中山大学学报（自然科学版）》2018年第6期56-62,共7页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金(51378514)

摘　　要：为研究轨道-路基参数对高速铁路路基动应力响应的影响,在ABAQUS软件平台建立了无砟轨道-路基-地基三维动力有限元耦合模型。基于该模型,研究了扣件刚度、CA砂浆、支承层、基床表层、基床底层、路基本体以及地基弹性模量对路基各层动应力响应的影响。通过与室内足尺无砟轨道-路基模型试验结果进行对比,验证了数值模型的可靠性。结果表明:支承层、基床底层以及路基本体弹性模量对路基动应力影响较大,其中,基床底层弹性模量的变化对路基各层动应力的影响最为显著。当基床底层的弹性模量从60 MPa增加到180 MPa,基床表层的动应力增大了31.53%,基床底层的动应力减小了14.43%,路基本体的动应力减小了16.10%。The dynamic finite element coupled model of track-embankment-foundation system was established for parametric effect on dynamic stresses of subgrade under high-speed train load.The influence of fastener stiffness and the elastic modulus of the CA mortar layer,supporting layer,surface layer of subgrade,bottom layer of subgrade,subgrade body,and foundation has been analyzed.Comparison between measured data of the full-scale model and the simulation results shows good agreement.The result of the analyses indicated that the elastic modulus of the supporting layer,bottom layer of subgrade and subgrade body has a bigger effect on the dynamic stress response on the subgrade.The elastic modulus of the bottom layer of subgrade has the biggest effect on the dynamic stress response on the subgrade.When the elastic modulus of bottom layer of subgrade increased from 60 MPa to 180 MPa,the surface layer of subgrade dynamic stress increased by 31.53%,the bottom layer of subgrade dynamic stress reduced by 14.43%,the subgrade body dynamic stress reduced by 16.10%.

关 键 词：高速铁路 路基 动应力 有限元 足尺模型试验 

分 类 号：TU44[建筑科学—岩土工程]