CRC+AC复合式路面沥青混凝土层荷载型开裂分析  

Analysis of Load-type Cracking of Asphalt Layer of Continuously Reinforced Concrete Composite Asphalt Pavement

作　　者：邓凤祥[1] 李盛[2] 

机构地区：[1]湖南省交通科学研究院,长沙市410015 [2]长沙理工大学,长沙市410004

出　　处：《公路》2015年第2期1-5,共5页Highway

基　　金：国家自然科学基金项目;项目编号51178062;51038002;湖南省自然科学基金资助项目;项目编号14JJ7041;湖南省教育厅科学研究项目;项目编号14B001

摘　　要：针对CRC+AC复合式路面结构的特点和现有研究的不足,运用有限元法,分析了交通荷载作用下AC层的受力状态;运用断裂力学理论和有限元法,对CRC+AC复合式路面反射裂缝的扩展机理进行了研究,计算了反射裂缝的扩展强度,分析和研究了结构层厚度与裂缝长度对Ⅱ型反射裂缝扩展的影响规律。研究结果表明:在交通荷载作用下,AC层出现裂缝的可能性很小,但由于温度、施工、材料老化等各种因素的影响,AC层还是会出现裂缝,增加结构层厚度尤其是沥青混凝土层厚度能减小反射裂缝的扩展。研究结果可为合理设计CRC+AC复合式路面的结构厚度提供理论依据。In light of the structure characteristics and flaws of CRC＋ AC composite pavement under current studies, the stress state of AC layer under traffic load is analyzed using finite element method, and by means of fracture mechanics theory and finite element method, the propagation mechanism of reflective cracks of CRC＋ AC composite pavement is studied, the propagation intensity of reflective cracks being calculated, and the influence of structure layer thickness and crack length on type Ⅱ reflective cracks being analyzed and studied. The results show that： under the traffic loads, the possibility of AC layer cracking is small, but due to such factors of temperature, construction, materials aging and other influence, the AC layer will still crack, and increasing thickness of structure layer could postpone crack propagation, especially increasing the thickness of AC layer. The results can provide a theoretical basis for rational design of structure thickness of CRC＋AC composite pavement.

关 键 词：道路工程 连续配筋混凝土 复合式路面 受力状态 裂缝扩展 

分 类 号：U416.224[交通运输工程—道路与铁道工程]