高速铁路路桥过渡段振动特性试验研究  

Vibration characteristics of high speed railway's bridge-subgrade transition section

作　　者：马伟斌[1] 韩自力[1] 朱忠林[1] 

机构地区：[1]中国铁道科学研究院铁道建筑研究所,北京100081

出　　处：《岩土工程学报》2009年第1期124-128,共5页Chinese Journal of Geotechnical Engineering

摘　　要：通过某高速铁路试验段现场动载试验,测试过渡段不同断面、不同深度处路基的动应力、弹塑性变形和路基综合动刚度,分析在模拟列车动荷载作用下的动态反应和工程特性。测试结果表明:①级配碎石基床表层对过渡段路基动应力的衰减效果明显,基床表层动应力衰减系数沿纵向逐渐减小,基床底层则逐渐增大;②各断面弹塑性变形主要集中在基床表层,沿纵向呈增大趋势,沿深度逐渐减小;③路基综合动刚度与基床表层、底层、路堤本体的刚度有关。过渡段路基从动应力传递规律、弹塑性变形、路基综合动刚度等方面起到了过渡作用。Through the in-situ dynamic load experiments on the test section along a certain high speed railway, the dynamic stress, elasto plastic deformation and compositive dynamic stiffness at different sections and depths are obtained. The engineering characteristics and dynamic responses of the bridge-subgrade transition section are studied under the simulated train dynamic loads. It is verified that （1） the attenuation effect of the dynamic stress in the subgrade composed of graded broken stones is very obvious. The attenuation coefficient of the dynamic stress on the subgade surface layer decreases gradually and the subgrade bottom is contrary. （2） The elasto-plastic deformation concentrated on the surface layer of the subgrade increases gradually along the longitudinal direction and contrary along the depth direction. （3） The compositive dynamic stiffness of the subgrade relates with the stiffnesses of the surface layer, the bottom layer and the embankment. In a word, the subgrade of bridge-subgrade transition section is of the transition function from the transfer laws of the dynamic stress, elasto plastic deformation and compositive dynamic stiffness of the subgrade.

关 键 词：动载试验 路桥过渡段 动刚度 动变形 动应力 

分 类 号：TU413[建筑科学—岩土工程]