路面结构层间结合状态的研究

A Study of Contact Conditions of Interfaces in Pavement Layers

我国现行的柔性路面结构设计方法是以多层弹性体理论解为基础,其层间假设为两种极端情况:完全连续和完全光滑。本文引用古德曼(Goodman)层间结合力学模型来描述多层柔性路面结构层间的半结合状态,并基于这种力学模型给出了求解半结合N层弹性体应力、位移理论解的边界条件。文中计算分析了层间粘结系数K对路面结构受力状态的影响,提出了抗剪强度和粘结系数的实验室实测结果;分析了各种因素对粘结系数的影响,提出了可用于柔性路面结构设计的粘结系数取值方法。

The design of flexible pavement in China so far is baseed on the theoretical solution of elastic multi-layered system in which two extreme interface conditions, i.e. perfectly rough or perfectly smooth have been assumed. In this paper, Goodman's constitutive law is adopted to describe the behavior of a partially integrated interface between the various layers in a multi-layered flexible pavement and the boundary conditions for solving the multi-layered elastic system with partially rough interface based on the constitutive law are given. In the paper, the influence of the interface adhesive coefficient K on structural behavior of the pavement under loading has been analyzed and the method for evaluating the interface adhesive coefficient in laboratory is suggested and measured results of the shearing strength and the interface adhesive coefficient are presented Finally, the effects of various factors on the coefficient are investigated and the method to determine the values of the coefficient used in a flexible pavement design is presented.