沥青混合料抗拉性能试验研究及力学特性分析  

Mechanical Simulation and Experimental Research on Tensile Performance in Asphalt Mixtures

作　　者：吕光印[1] 郝培文[1] 陈志一[1] 汪海年[1] 

机构地区：[1]长安大学公路学院,西安市710064

出　　处：《公路》2008年第5期143-147,共5页Highway

基　　金：国家自然科学基金项目;项目编号50578016

摘　　要：沥青混合料的抗拉性能是表征其低温与疲劳性能的重要指标。本文针对半圆弯曲试验(SCB)与劈裂试验(IDT)建立三维非线性有限元模型,对两种试验方法的受力特点与破坏模式进行数值模拟,并利用室内试验进行验证。结果表明:两试验中试件的力学响应规律明显不同;半圆弯曲试验试件主要承受拉应力,劈裂试验试件内出现压缩、拉伸、剪切多种受力模式交织现象;非轴对称受力时,劈裂试件的应力响应更为复杂,不能充分体现间接拉伸的目的。相比较而言,半圆弯曲试验更能模拟沥青混凝土路面的层底受拉状况。The tensile property of asphalt mixtures displays the low temperature and fatigue performance. To research the the mechanical responses and failure modes, three-dimensional nonlinear models are set up for the indirect tensile （IDT） specimen and the semi-circular bending （SCB） specimen, and the numerical analysis results are confirmed by laboratory tests. The results show that the mechanical response of IDT specimen is different from that of SCB; the dominant stress state in the SCB test is tensile stress, but the IDT specimen display a complicated stress state including compression stress, tensile stress and shear stress ; in dissymmetrical state, there is a mixed stress state in IDT specimen, it may not getting tensile damage; the SCB test is better than IDT test in simulating the mechanical response of pavement.

关 键 词：道路工程 沥青混合料 劈裂试验 半圆弯曲试验 力学特性 

分 类 号：U414.75[交通运输工程—道路与铁道工程]