摘要
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。
Using iterative method and the finite element software ANSYS,For aggregate base, resilient modulus increases and bottom decreased. These structural parameters to study the equivalent modulus and impact of the correction factor. This paper analyzes the surface stiffness radius, thickness at the grass-roots level, load set, as well as the factors such as initial confining pressure across the layers of the bottom pressure stress, the bottom of the surface layers of flexural stress index of the influence law of equivalent modulus correction coefficient. The results show that the nonlinear effects have great impact on bending tensile stress,and vertical stress in the bottom of surface layer, and have little impact on deflection, deflection basins and subgrade compressive strain, with general accuracy conditions it can be ignored.
出处
《综合运输》
2016年第6期56-59,共4页
China Transportation Review
基金
国家自然科学基金项目(51378394)
关键词
路面工程
粒料基层
非线性
等效模量
修正系数
Road Engineering
granular base
nonlinear
resilient modulus
equivalent modulus
