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本文介绍一种以二维有限元(ANSYS)模型对厚度75mm和100mm的一种连锁混凝土路面砖路面,进行车轮通过路面加速试验时的受力分析。路面砖是一种采用蜂窝状塑料模型成型、形成连锁,路面砖铺设在加速试验装置(APTF)的路基上。分析所用模型具有一个三层的结构体系,面层是蜂窝状塑料模型连锁混凝土路面砖,第二层是铺设基础层,第三层是路基层;该有限元分析模型的几何性能、路基的当量弹性模量、各层材料的泊桑比,取自试验研究结果,以及通过回归计算机程序BACKGA计算得到性能的估算值。采用K-θ模型和Park-Fernando模型,确定铺设基础层的弹性模量;采用同样的有限元(简写为:FE)模型,分析铺设基础层材料性能(k1,k2和k3),以便采用研究粒状材料特性的Park-Fernando模型,来估算粒状材料基础层的应力关系。研究发现,采用Park-Fernando公式得到的基础层的模量值,接近使用BACKGA计算程序得到基础层模量的回归计算值,这些数值与模型配合,即可通过迭代过程确定蜂窝状塑料模型连锁混凝土路面砖路面的当量弹性模量。试验室研究发现,在经历不同负载往返次数后,75mm厚路面砖的当量弹性模量都稍微高于100mm厚路面砖的当量弹性模量;研究还发现,采用有限元模型得到的弹性模量值接近用回归法计算得到的弹性模量值。本文为选择新建道路的地面材料,提供了一种设计选择方法。
In this paper, a kind of interlocking concrete pavement pavement with 75mm thickness and 100mm thickness is analyzed by two-dimensional finite element (ANSYS) model. Pavement tile is a kind of honeycomb plastic model forming, forming a chain, pavement bricks laying in accelerated test device (APTF) of the roadbed. The model used in the analysis has a three-layer structural system, the surface layer is a cellular plastic model interlocking concrete pavement brick, the second layer is a foundation layer and the third layer is a subgrade layer. The geometric properties of the finite element analysis model, Elastic modulus, Poisson’s ratio for each layer of material, taken from the results of the experimental studies, and an estimate of the performance calculated by regression computer program BACKGA. The K-θ model and the Park-Fernando model were used to determine the elastic modulus of the foundation layer. The same finite element (FE) model was used to analyze the material properties of the foundation layer (k1, k2 and k3) The Park-Fernando model of granular material properties is used to estimate the stress relationship of the granular material base layer. The study found that the modulus values of the base layer obtained by the Park-Fernando formula are close to the regression calculations of the base layer modulus obtained using the BACKGA calculation program. These values are used in conjunction with the model to determine the honeycomb plastic model interlocked concrete Equivalent elastic modulus of pavement pavement. The laboratory study found that the equivalent modulus of elasticity of 75mm thick pavement brick is slightly higher than that of 100mm thick pavement brick after going through different load reciprocation times. The study also found that the elastic modulus value obtained by finite element model Close to the elastic modulus value calculated by regression method. This article provides a design selection method for selecting ground materials for new roads.