基于等效弹性半空间的旧水泥路面沥青加铺层设计简化方法  

A simplified method for the design of asphalt concrete overlay on the old cement concrete pavement based on equivalent homogenous half-space

作　　者：吕松涛[1] 樊国鹏[1] 杨勇[1] 陈杰[1] 

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410004

出　　处：《长沙理工大学学报（自然科学版）》2015年第4期1-6,29,共7页Journal of Changsha University of Science and Technology:Natural Science

基　　金：国家自然科学基金资助项目(51208066;51578081);河南省交通运输科技计划项目(2013K28);广西道路结构与材料重点实验室开放基金项目(2014gxjgclkf-002);公路工程教育部重点实验室开放基金项目(kfj130103);湖南省科技计划项目(2014TT2032)

摘　　要：为了简化旧水泥路面沥青加铺层的设计方法,首先基于弹性层状体系理论,利用BISAR对沥青加铺层进行力学响应分析,将原路面简化等效为一个弹性半空间体,沥青加铺层视为一个柔性面层,通过计算确定了沥青加铺层最大剪应力的位置;然后从莫尔-库仑强度理论出发,揭示了沥青加铺层最大剪应力与加铺层厚度、等效模量之间的变化规律,建立了沥青加铺层层内最大剪应力与加铺层厚度、等效模量之间的对应关系。研究结果表明,原路面结构等效前后沥青加铺层最大剪应力变化规律一致,沥青加铺层最大剪应力出现在加铺层层内,沥青加铺层层内最大剪应力与加铺层厚度、原路面结构的等效模量值之间呈现较好的对数线性关系。以等效结构下沥青加铺层层内最大剪应力为设计指标,不但可以简化设计步骤和计算量,而且可以满足设计精度要求。In order to simplify the design method for asphalt concrete overlay ment concrete pavement, based on elastic multilayer theory, mechanical res on pon the old cese analysis of asphalt concrete overlay was conducted using BISAR software, the original pavement was simplified as equivalent homogenous half-space, with asphalt overlay as a flexible layer, and the location of asphalt concrete overlay with the maximum shear stress was determined through calculation. Based on More-Coulomb strength theory, the change rule of the maximum shear stress with the variation of the asphalt concrete overlay thickness and the equivalent modulus was presented and the corresponding relationship between the maximum shear stress and the asphalt concrete overlay thickness and equivalent modulus was established. Results show that the change rule of the maximum shear stress hardly varies before and after the simplification. The maximum shear stress in asphalt concrete overlay is in it-self. The maximum shear stress in asphalt concrete overlay shows good logarithmic linear relationship with the overlay thickness and the equivalent modulus of the original pavement. Using the maximum shear stress in asphalt concrete overlay obtained with the simplification method as a design indicator can simplify the design steps and calculation, and meet the accuracy requirement.

关 键 词：道路工程 水泥路面 沥青加铺层 弹性半空间体 最大剪应力 

分 类 号：U416.217[交通运输工程—道路与铁道工程]