我们可以画一簇曲线，这簇曲线处处都有一个主方向作为切线，这些曲线叫做应力轨线。
We may draw curves which have everywhere one of these directions for a tangent, these curves are called stress trajectory.
隧道埋深越大，路基内附加动应力整体水平越低，对轨下结构的影响越小。
The deeper the tunnel is, the lower the whole level of dynamic stresses in roadbed is and the smaller the influence on tunnel is.
螺栓扭矩增大，接头区钢轨轨腰拉力、夹板应力、螺杆内应力都会增大，而钢轨位移会随着螺栓扭矩的增大而减小。
As the bolt tension increase, the tension of rail web, stress of joint bar and stress of joint bolt would increase accordingly, but the displacement of rail would become smaller.
结果表明轨下构筑物的存在将减弱列车动应力往深层传递的衰减。
The analysis results indicate that the attenuation of additional dynamic stress along depth is reduced with existence of the structure under rail.
桥梁和轨道的联结采用非线性梁单元模拟，其材料弹性模量和屈服应力通过轨道纵向位移阻力与梁轨相对位移关系的双折线化确定；
The coupling between bridge and track adopts by beam unit, modulus of electricity of and yielding stress according to the broken line of the non-liner rail longitudinal resistance of displacement.
在对轮-轨系统进行有限元分析的基础上，研究了轨道的受力情况和摩擦系数对应力分布的影响，讨论了轨道的弹塑变形和安定极限。
The finite element analysis of the wheel rail contact shows that the maximum stress under the subsurface exceeds first yield strength, which leads to plastic deformation.
对于工况参数，主要分析了横移量、轴重和轨底约束对轮轨滚动接触应力场的影响。
The effects of case parameters on the distribution of elastic-plastic stress hi railhead are analyzed including lateral displacement, gross rail load on axle and constrained conditions of rail bottom.
对于工况参数，主要分析了横移量、轴重和轨底约束对轮轨滚动接触应力场的影响。
The effects of case parameters on the distribution of elastic-plastic stress hi railhead are analyzed including lateral displacement, gross rail load on axle and constrained conditions of rail bottom.
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