摘要
反射裂缝是导致复合式道面失效的主要病害之一,为研究大型飞机荷载作用下受反射裂缝控制的沥青加铺层疲劳寿命,首先,采用复合型应力强度因子作为力学指标,建立了基于反射裂缝扩展规律的沥青加铺层疲劳寿命预测模型。其次,采用有限元方法模拟分析了不同工况条件下最不利荷位的沥青加铺层应力状况,进而得出了复合型应力强度因子在不同加铺层结构中的变化规律,建立了沥青加铺层疲劳寿命与道面各结构层几何力学参数之间的关系方程。最后,以国内某枢纽机场跑道加盖工程为例,应用该方法优化了沥青加铺层结构方案,计算得出的沥青加铺层结构组合“6 cm沥青玛蹄脂碎石混合料(SMA,stone mastic asphalt)+9 cm沥青混凝土(AC,asphalt concrete)”在实际工程中被采纳。
Reflective crack is one of the primary pavement distresses leading to the failure of composite pavement.To study the fatigue life of asphalt overlay controlled by reflective crack induced by large aircraft,composite stress intensity factor was firstly taken as the mechanical index to establish the fatigue life prediction model of the asphalt overlay based on propagation law of reflective crack.The distribution of stress on the asphalt overlay under the critical locations of gear loads with different interface conditions was then simulated by finite element method.Then,the regular pattern of the composite stress intensity factor was also obtained and applied to establish a formula between the fatigue life and the mechanical&geometrical parameters of different overlay structures.Finally,the formula was applied to optimize the asphalt overlay structure of the runway in a civil hub airport and the result turned out to be 6 cm SMA(stone mastic asphalt)+9 cm AC(asphalt concrete).
作者
史超
张磊
田帅团
姚鹏飞
SHI Chao;ZHANG Lei;TIAN Shuaituan;YAO Pengfei(China Airport Planning&Design Institute Co.,Ltd.,Beijing 100101,China;ITS Center,Southeast University,Nanjing 210018,China;Beijing Super-Creative Technology Co.,Ltd.,Beijing 100624,China)
出处
《中国民航大学学报》
CAS
2023年第1期41-46,共6页
Journal of Civil Aviation University of China
基金
国家自然科学基金项目(51778142)
中国民用航空局科技基金项目(MHRD20140215)
关键词
复合式机场道面
疲劳寿命
反射裂缝
复合型应力强度因子
composite airport pavement
fatigue life
reflective crack
composite stress intensity factor
