摘要
采用疲劳断裂理论,根据完好路面结构半刚性基层底部弯拉应力等效原则,对三维与平面应变模型荷载进行近似地等效转换。以裂缝扩展速率为等效原则,给出不同轴型和级位下荷载型反射裂缝的轴载换算系数,并与现有沥青路面设计规范进行分析比较。结果表明,基于裂缝扩展速率等效原则的轴载换算系数当轴重小于标准轴载时,比现有沥青路面设计规范中轴载换算系数略微偏大,当轴重大于标准轴载时,要偏小一些。
By applying the theory of fatigue fracture, equivalent conversion of load between 3-D model and plane strain model was performed according to the equivalent principle of maximal stress in undamaged semirigid base. Subsequently, axle load conversion coefficient of reflective crack under different loads based on the equivalent speed of crack expansion was presented. Then, the conversion coefficient was compared with tee current specification for design of highway asphalt pavement. The result shows that （ 1 ） if axle mass is less than standard axle load, the axle load conversion coefficient based on the equivalent principle of crack propagation velocity is larger than that in existing specification; （2） on the contrary, it is smaller.
出处
《公路交通科技》
CAS
CSCD
北大核心
2010年第9期1-7,共7页
Journal of Highway and Transportation Research and Development
关键词
道路工程
轴载换算
疲劳断裂
反射裂缝
应力强度因子
road engineering
axle load conversion
fatigue fracture
reflective crack
stress intensify factor
