摘要
研究半刚性基层沥青混凝土路面早期开裂的原因,确定疲劳开裂控制因素。进行道路结构足尺应变测试,并采用有限元数值模拟技术对道路结构内部应力场及应变场进行相应分析。以应力水平大小确定疲劳开裂控制因素。依据足尺试验测试结果及数值模拟计算结果分析可知,半刚性基层沥青混凝土路面在荷载作用下结构内部存在明显的受压区、弱拉区及强拉区分布,其中强拉区在道路结构内部连续分布。底基层最大应力水平达到85%。半刚性基层沥青混凝土路面疲劳开裂的控制因素应为底基层强度特性,底基层开裂引发的反射裂缝现象应是路面早期开裂的主要原因。
Crack reasons of semi-rigid base asphalt pavement are studied to determine the fatigue crack control factors. Pavement structure test with full scale is conducted, and corresponding stress field and strain field of pavement structure are analyzed by finite element numerical simulation technology. Fatigue crack control factors are determined by stress level. Test results obtained from full scale experiments and numerical simulation calculation show that there are obvious compressive zone, weak tensile zone and strong tensile zone in asphalt pavement structure when being loaded, and strong tensile zone is continuously distributed inside the pavement structure. Maximum stress level of subbase course reaches 85%. Fatigue crack control factor of semi-rigid base asphalt pavement should be the subbase strength characteristics and reflection phenomenon brought by subbase course crack is the main reason of pavement early crack.
出处
《公路》
北大核心
2014年第6期32-36,共5页
Highway
基金
吉林省交通科技发展计划资助项目
项目编号3D5093224424
吉林大学科学前沿及学科交叉研究计划资助项目
项目编号450060445202
关键词
道路工程
疲劳开裂
应变场测试
数值计算
控制因素
road engineering
fatigue crack
strain field experiment
numerical simulation calculation
control factor
