复合道面结构抗冲击性能试验与数值模拟

采用大型落锤冲击机对一种新型复合道面板进行了冲击荷载作用下的动态响应试验，该新型复合道面板自上而下依次为:土工格栅加固的沥青混凝土(AC)层、高强度混凝土(HSC)层及复合水泥基(ECC)层。通过落锤冲击试验获得道面层结构的损伤形式及变形特征，随后采用混凝土损伤材料模型模拟复合道面体系中混凝土类材料的动力特性。对材料模型的主要参数进行验证和确定，包括界面特性和各层材料的动力增长因数。根据新型复合道面体系的实验室落锤冲击试验结果，通过比较其破坏形式、损坏直径及位移值对数值模型进行了校核和验证。结果表明:提出的考虑界面性能和动力增长因数的三维数值模型能够较准确地模拟该复合道面体系在冲击荷载作用下的真实特性，且验证后的模型可进一步应用于研究不同因素（材料强度、断裂能及层间界面）对新型复合道面体系在不同冲击荷载作用下抗冲击性能的影响。

Experiment and Numerical Simulation on Impact Resistance of Composite Pavement Slab

The experiment on dynamic response of a new composite pavement slab under impact load was evaluated. The new composite pavement structure consisted of asphalt concrete (AC) layer reinforced with geogrid, followed by high strength concrete (HSC) layer and then engineered cementitious composites (ECC) layer. The damage forms and deformations of the composite pavement structure were gained by drop weight test, and the dynamic behavior of concrete materials in composite pavement structure system was simulated by concrete damage material model. The main parameters of the material model were verified and determined, including the interface characteristics and the dynamic growth factor of the materials in each layer. According to the test results of the laboratory impact drop hammer of the new composite pavement system, the numerical model was checked and verified by comparing the failure form, damage diameter and displacement value.The results show that the 3D numerical model considering interfacial properties and dynamic growth factor can accurately simulate the real behavior of composite pavement system under impact load, and the model can be used to study the effects of different factors (materials strength, fracture energy and interlayer interface) on the impact resistance of new composite pavement system under different impact loads.