机场复合道面反射裂缝形成和演变的机理研究

The airfield composite pavement is an important topic in airport engineering in recent years. The reflective crack is one of major failure modes of the airfield composite pavements. Research on the mechanism of the appearance and development of reflective cracks of the airfield composite pavements is very necessary for designing the airfield composite pavements reasonably. In this project, the elastoplastic fracture theory and a meshless method will be introduced into the research on reflective cracks of the airfield composite pavements. Firstly, the enriched element-free Galerkin method for elastoplastic fracture problems is presented, and the experiments of the airfield composite pavements with reflective cracks, interlayer cracks and base course cracks will be done. Then the airfield composite pavements with reflective cracks, interlayer cracks and base course cracks will be analyzed numerically by using the enriched element-free Galerkin method for elastoplastic fracture problems, and the crack propagation paths will be analyzed. At last, from the experiments and the numerical results, the mechanism of the appearance and development of reflective cracks of the airfield composite pavements will be obtained. This project will promote the development of researches on reflective cracks of the airfield composite pavements and the asphalt pavements with semi-rigid base courses, and obtain the referenced results for designing the airfield composite pavements. And it will also promote the development of researches on meshless methods for nonlinear and fracture problems.

机场复合道面是近年来机场工程领域研究的重要课题，而反射裂缝是机场复合道面的主要破坏形式之一，因而研究机场复合道面反射裂缝的形成和演变的机理对机场复合道面的合理设计是非常必要的。本项目将引入弹塑性断裂力学和无网格方法研究机场复合道面反射裂缝，首先研究弹塑性断裂力学的扩展的无单元Galerkin方法，并对含反射裂缝、层间裂缝和基层裂缝的机场复合道面进行实验研究；利用弹塑性断裂力学的扩展的无单元Galerkin方法对含反射裂缝、层间裂缝和基层裂缝的机场复合道面进行数值分析，研究其裂缝扩展路径。最后根据实验和数值分析结果，分析机场复合道面反射裂缝形成和演变的机理。本项目研究将促进机场复合道面和半刚性基层沥青路面反射裂缝的研究进展，为机场复合道面设计提供参考，也将促进非线性问题和断裂力学无网格方法的研究进展。

机场复合道面是近年来机场工程领域研究的重要课题，而反射裂缝是机场复合道面的主要破坏形式之一，因而研究机场复合道面反射裂缝的形成和演变的机理对机场复合道面的合理设计是非常必要的。本项目引入弹塑性断裂力学和无网格方法研究机场复合道面反射裂缝，首先研究了断裂力学和弹塑性断裂力学的扩展的无单Galerkin方法、弹性动力学和弹塑性大变形问题的改进的无单元Galerkin方法、弹性地基板的无网格方法、以及三维问题的维数分裂无网格方法，并对含反射裂缝、层间裂缝和基层裂缝的机场复合道面进行了实验研究；利用断裂力学和弹塑性断裂力学的扩展的无单元Galerkin方法对含反射裂缝、层间裂缝和基层裂缝的机场复合道面进行了数值分析，研究其裂缝扩展路径。最后根据实验和数值分析结果，分析了机场复合道面反射裂缝形成和演变的机理。本项目现已发表期刊论文14篇(其中SCI收录8篇)，会议论文4篇，另外还有5篇期刊论文已录用；国际会议邀请报告4人次；培养硕士生6名(已毕业)。本项目研究将促进机场复合道面和半刚性基层沥青路面反射裂缝的研究进展，为机场复合道面设计提供参考，也将促进非线性问题和断裂力学无网格方法的研究进展。