重载作用下双层连续配筋水泥混凝土路面水平裂缝产生机理研究

Continuously reinforced concrete pavement (CRCP) has been widely used due to its excellent performance. However, horizontal cracking (HC) at the depth of longitudinal steel can be caused under environmental and heavy traffic loading, and will develop to premature distress eventually. HC is not considered in current pavement design theory as a new type of distress. The mechanism of HC in two-Layer steel CRCP under heavy traffic loading has not been well understood. In this research, the interaction between longitudinal steel and concrete under heavy traffic loading will be studied by using field distress survey, optimized modeling and testing road behavior monitoring. The factors responsible in HC, such as heavy traffic loading and environmental loading, reinforcement design, concrete properties and transverse crack spacing, will be explored. The mechanism of HC in two-layer steel CRCP under heavy traffic loading will be proposed and validated. It is expected that this research will be of practical significance to understand the mechanism of HC in two-layer steel CRCP under heavy traffic loading, identify the factors responsible, and mitigate HC.

连续配筋水泥混凝土路面由于其优异的路用性能而被广泛应用。然而，环境荷载和重载交通的共同作用易引起路面板纵向钢筋层深度处水平裂缝的产生，从而导致早期病害的出现。水平裂缝作为一种新发现的病害形式，未被纳入现行路面设计理论的考虑范围，尤其是重载作用下双层连续配筋水泥混凝土路面中水平裂缝的产生机理和影响因素尚不明朗。本研究拟采用现场调研、计算模型优化和试验路行为监测等方式，综合分析重载作用下纵向钢筋与其周围水泥混凝土的相互作用，探索重载和环境荷载、钢筋设计、混凝土材料性质和横向裂缝间距等因素对水平裂缝的影响规律，阐明双层连续配筋水泥混凝土路面中水平裂缝的产生机理。预期成果对重载作用下双层连续配筋水泥混凝土路面的优化设计和施工，预防和减缓水平裂缝的产生，延长路面使用寿命具有重要的理论意义和应用价值。

连续配筋水泥混凝土路面（简称CRCP）在重载作用下易出现水平裂缝引发的局部病害，水平裂缝的产生机理及行为有待进一步研究。本项目针对重载作用下我国典型基层结构上的双层配筋CRCP的水平裂缝，采用现场跟踪调查、三维有限元计算模型分析和试验路现场行为监测，分析了重载作用下纵向钢筋与其周围水泥混凝土的相互作用，从理论上预测了纵向钢筋深度处水平裂缝产生的可能性，对设计和施工中各主要因素的影响规律进行了分析，阐述并验证了双层配筋CRCP水平裂缝的产生机理。为预防和减缓重载作用下双层配筋CRCP水平裂缝的产生与发展，项目组提出了相应的设计和施工措施。为了更好的探究重载作用下双层配筋CRCP的结构行为，项目研究过程中提出了一种连续配筋混凝土路面固化温度曲线的测试方法，并通过试验路现场行为监测验证了固化温度曲线对重载作用下双层配筋CRCP结构行为的影响。该项目研究成果有望增强行业对CRCP水平裂缝及局部病害的认知，为CRCP的优化设计和施工提供理论和技术的创新性支持。