旧砼路面上沥青加铺层疲劳开裂的损伤力学分析  

Analysis of the asphalt concrete overlay fatigue cracking on existing cement concrete pavement by using damage mechanics

作　　者：周志刚[1] 袁秀湘[1] 

机构地区：[1]长沙理工大学道路结构与材料交通行业重点实验室,湖南长沙410004

出　　处：《长沙理工大学学报（自然科学版）》2010年第4期12-18,共7页Journal of Changsha University of Science and Technology:Natural Science

基　　金：国家自然科学基金资助项目(50778027);湖南省自然科学基金资助项目(04JJ3033)

摘　　要：运用疲劳损伤力学-有限元方法,对旧水泥混凝土路面沥青混凝土加铺层进行疲劳损伤断裂全过程数值模拟计算分析,系统地探讨地基支承条件、接缝(裂缝)传荷能力、沥青混凝土加铺层厚度以及加筋作用等因素对沥青混凝土加铺层疲劳开裂的影响.研究结果表明,接缝传荷能力对沥青混凝土加铺层疲劳开裂影响最为显著,它决定了裂缝的起源、裂缝发展方向以及加铺层疲劳开裂寿命;而加筋材料能有效地改善接缝位置加铺层的受力状态,从而延长加铺层疲劳寿命.与现场观测资料进行对比的结果表明,所开展的疲劳损伤分析是合理的.By using fatigue damage mechanics-finite element method,the numerical simulation has been carried out in calculating and analyzing of the total process of the asphalt concrete overlay fatigue cracking on existing cement concrete pavement.The influence on the asphalt concrete overlay fatigue cracking of the factors such as foundation supporting,load-transfer capacity of joint,thickness of asphalt concrete overlay and reinforcing function is discussed systematically.The results show the influence of load-transfer capacity of joint is the most notable one,and it determines the crack outset and its developing direction and the overlay fatigue cracking life.The reinforcement can effectively reduce the level of stresses in overlay on joint and to prolong the overlay＇s fatigue life.Compared with the field testing results,it is proved that the fatigue analysis is rational.

关 键 词：损伤力学 疲劳开裂 沥青加铺层 水泥混凝土路面 

分 类 号：U416.217[交通运输工程—道路与铁道工程]