含脱空水泥混凝土路面交通荷载下的疲劳损伤机理  

Fatigue damage mechanism of cement concrete pavement with void under traffic load

作　　者：薛彦卿[1,2] 黄晓明[1] 石小武 马涛[1] 

机构地区：[1]东南大学交通学院,南京210096 [2]镇江市公路管理处,镇江212028

出　　处：《东南大学学报（自然科学版）》2014年第1期199-204,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51008071);江苏省自然科学基金资助项目(BK2010413)

摘　　要：为获得含脱空水泥混凝土路面交通荷载下的疲劳损伤机理,开发了疲劳损伤本构关系的ABAQUS用户子程序UMAT,分析了全耦合方法下基准路面结构模型疲劳损伤场的分布与发展规律,并研究了交通荷载与面板弹性模量、面板厚度、脱空尺寸等路面结构参数对水泥混凝土路面结构裂纹形成疲劳寿命的影响.研究结果表明,随荷载作用次数的增加,路面结构的疲劳损伤不断增加,但其增幅逐渐减小,路面结构的荷载应力也逐渐减小.随着交通荷载的增加,路面结构的对数疲劳寿命呈线性减小趋势;随着面板厚度的增加,路面结构的对数疲劳寿命呈线性增加趋势;随着脱空尺寸的增加,路面结构的对数疲劳寿命呈幂函数曲线相关关系.In order to obtain the fatigue damage mechanism of cement concrete pavement with void under traffic load, the user subroutine UMAT （user-defined material mechanical behavior ） in ABAQUS for the fatigue damage constitutive relation is compiled. Then, the distribution law and the development law of the fatigue damage field of the standard pavement structure model by the fully coupled approach are analyzed. Finally, the influences of traffic load and the pavement structural pa- rameters such as the slab elasticity modulus, slab thickness and void size on the crack formation fa- tigue life of the cement concrete pavement structure are researched. The results show that with the increase in the number of load cycles, the degree of fatigue damage of pavement structure increases continuously while its increment rate decreases. Meanwhile, the load stress in the pavement structure also decreases gradually. With the increase of the traffic load, the natural logarithm of the pavement structural fatigue life decreases linearly. With the increase of the slab thickness, the natural logarithm of the pavement structural fatigue life increases linearly. With the increase of the void size, the natu- ral logarithm of the oavement structural fatigue life exhibits a decline curve of the oower function.

关 键 词：交通荷载 水泥混凝土路面 疲劳损伤机理 疲劳寿命 全耦合方法 路面结构参数 

分 类 号：U416.21[交通运输工程—道路与铁道工程]