论文部分内容阅读
应用迭代法和有限元软件ANSYS,建立可考虑粒料层非线性特性的路面结构分析程序;对于粒料基层柔性路面而言,在圆形荷载作用下粒料基层上中部的弹性模量较初始值有所增加,而下部性模量则减小。粒料基层弹性模量这种变化对路面结构力学响应的影响可通过等效模量修正系数来表征。本文详细分析了面层刚度半径、基层厚度、荷载集度、以及初始围压等因素对面层层底压应力、面层层底弯拉应力指标的等效模量修正系数的影响规律。结果表明,粒料层非线性对面层层底压应力、面层层底弯拉应力的影响较大,而对路表弯沉、路表弯沉盆及土基压应变的影响很小,一般精度要求时可忽略。
The iterative method and the finite element software ANSYS were used to establish the pavement structure analysis program which can consider the nonlinear characteristics of the granular layer. For the flexible pavement of the granular aggregate, the elastic modulus of the middle of the granular aggregate under the circular load is higher than that of the initial The value increases, while the lower part modulus decreases. The effect of such change of the elastic modulus of the aggregate on the mechanical response of pavement structure can be characterized by the equivalent modulus correction coefficient. In this paper, the effects of surface stiffness radius, base thickness, load concentration, initial confining pressure and so on on the modulus correction coefficient of bottom surface compressive stress and surface tensile stress at bottom are analyzed in detail. The results show that the nonlinear effect of the granite layer on the bottom pressure stress and the bending stress at the bottom of the surfacing layer is great, but the effect on the deflection of the road surface, the deflection of the road surface and the compressive strain of the soil foundation is small, Accuracy can be ignored.