摘要
以直线段上高速铁路为研究对象,建立精细化的轨道-路基-地基系统非线性动力学仿真模型。采用接触对模拟底座板和基床表层的动力相互作用,采用材料非线性本构关系和三维黏弹性静-动力统一人工边界模拟列车运行前的静应力状态,依托高性能并行计算研究移动荷载下高速铁路路基中应力主轴的空间旋转效应及规律,并与半无限地基表面直接作用移动荷载的结果进行比较。结果表明:高速铁路路基中受载与非受载钢轨正下方相同深度单元的应力主轴在xy、xz和yz平面内均发生连续、同步的旋转,但旋转模式和强弱存在明显差异,均比半无限地基表面直接作用移动荷载的情形复杂;受载钢轨正下方单元的应力主轴旋转强度随深度增加而减弱;表面波对表层单元的应力主轴旋转有明显影响。
The elaborated nonlinearly coupled dynamic simulation model for track-embankment-foundation on straight high-speed railway was established to investigate the rotation laws of principal stresses axes in embankment.The dynamic interaction of the concrete base-upper layer of formation was simulated using contact pairs.The static stress state of the train before its operation was simulated by the combined use of nonlinear material constitutive model and the three-dimensional viscoelastic static-dynamic unified artificial boundaries.The effects and laws for the rotations of principal stress axes in embankment induced by moving loads were investigated based on high performance computation(HPC).The rotations in embankment were compared with the results of the direct action of the moving load on the surface of a semi-infinite foundation.The results show that the principal stress axes for the elements located just below loaded and unloaded rails at the same depth rotate synchronously and continuously in the xy,xz,and yzplanes,but remarkable differences are found in rotation modes and intensity between them.The rotations in embankment are much more complicated than the situation of direct action of moving loads on the surface of a semi-infinite foundation.The intensity of rotations of principal stress axes for the elements located below the loaded rails attenuate with the increase of the depth.Surface waves have significant influences on the rotations of principal stress axes of the elements located at thetop of the analysis models.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2018年第2期100-109,共10页
Journal of the China Railway Society
基金
重庆市教委科学技术研究项目(KJ1600526)
重庆市基础与前沿研究计划(cstc2016jcyjA0088)
关键词
应力主轴旋转
移动荷载
表面波
共振
高速铁路路基
rotations of principal stress axes
moving load
surface wave
resonance
high-speed railway embankment
