石质路基路面结构应力分析  

Stress Analysis of Pavement Structure Based on Rock Subgrade

作　　者：袁玉卿[1] 郭涛[1] 王笑风 许海铭[1] 

机构地区：[1]河南大学土木建筑学院,河南开封475004 [2]河南省交通规划勘察设计院有限责任公司,河南郑州450052

出　　处：《郑州大学学报（工学版）》2014年第4期19-23,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：河南省自然科学研究计划资助项目(2011A580001);河南省交通运输厅科技项目(2010PII10)

摘　　要：为研究石质路基路面的内力分布,采用4 cm厚AC-13+6 cm厚AC-20沥青面层,水泥混凝土、级配碎石、级配碎石调平层,水泥混凝土、ATB-25为基层,建立模型,研究路基模量、荷载对拉应力和剪应力的影响.结果表明:路基模量变化对路面结构应力影响不大;路面结构层内一般只有压应力,随着深度增加逐渐产生拉应力,到达一定深度后逐渐趋于0;荷载圆中心更容易产生拉应力,但是拉应力较小;荷载圆边缘更容易产生压应力,某深度后产生拉应力,此拉应力较大;剪应力随荷载的增大而增大,在一定深度时剪应力突降,之后逐渐变小并趋于稳定.To explore the distribution of internal force in pavement structures on stone roadbed, the model was built. The structure is made up of 4 cm AC-13 ＋6 cm AC-20 asphalt surface course, cement concrete, graded gravel, graded broken stone leveling layer, basement layer of cement concrete and ATB-25. Based on the model, the effects of subgrade modulus on tensile stress and shear stress were studied. Results show that chan- ges of subgrade modulus have little effect on pavement structure stress. Commonly, compressive stress only ex- ists inside the pavement structure layer. Tensile stress increases gradually with depth, and tends to zero final- ly. The tensile stress easier appears in the circle center of load, but it is less. The compressive stress is more prone to generation at the edge of load round ; then, the tensile stress appears in some depth with a bigger val- ue. Shear stress increases with the loads, and suddenly drops in certain depth; then, gradually it decreases and tends to be stable.

关 键 词：道路工程 路面结构 石质路基 应力 超载交通 

分 类 号：U416.2[交通运输工程—道路与铁道工程]