路面结构破坏行为无网格法分析与模拟

项目名称： 路面结构破坏行为无网格法分析与模拟

项目编号： No.51478053

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑环境与结构工程学科

项目作者： 杨建军

作者单位： 长沙理工大学

项目金额： 80万元

中文摘要： 路面结构破坏行为是道路工程研究的关键问题，它涉及路面结构在复杂荷载工况下的应力状态、结构变形、损伤演化和宏观断裂。鉴于实际问题的复杂性和挑战性，问题的解答越来越依赖于数值计算科学的支撑。无网格法是计算科学自有限元法之后一个重要的研究趋势，是一种具有广阔应用前景的数值计算方法，在路面结构破坏行为的数值模拟中具有独特优势。本项目将探索无网格法在路面力学计算中的应用，并对路面结构破坏的力学机理进行研究。基于无网格介点法(MIP)和轴对称弹性力学理论，建立多层轴对称体无网格法路面结构数值模型。引入更接近实际情况的荷载作用模式，计算分析路面结构内的真实受力状态，并对路面结构的破坏特性和设计指标进行研究。利用无网格法在材料非线性问题及自适应分析中的显著优点，对路面结构的大变形行为和断裂行为进行模拟分析。研究结果可以为路面力学计算提供一种新的数值计算理论和方法，为路面结构的合理设计提供理论依据。

中文关键词： 沥青路面；数值模拟；破坏机理；无网格法；路面力学

英文摘要： Pavement structural damage is an important problem for road engineering, which relate to stress, deformation, defect and fracture of pavement by complicated loads. In order to prevent or alleviate the early failure of road pavement, the study of this problem should be paid much attention. Because of the complexity and difficulty of the problem, numerical methods play an important role in the research. Meshless method with its flexibility and simplicity, as an alternative numerical approach to overcome some limitations of conventional computational methods, has drawn much attention in recent decade. Moreover, the method has special advantages in numerical simulation of pavement damage. This project will focus on applying meshless method to pavement mechanics calculation, and researching the failure mechanism of road pavement damage. Layered axisymmetric pavement numerical model of meshless method will be established, which is based on the meshless intervention point method (MIP) and the axisymmetric body elasticity theory. The stress characteristics in pavement will be calculated by more actual load model, the damage characteristics and some design indexes will also be analyzed. The large deformation and fracture process of pavement structure will be simulated, relying on the natural advantage of meshless method to solve material nonlinear problem and self-adaption calculation problem.The results will present a new numerical theory and approach for mechanics calculation of pavement, and supply theory evidence for reasonable design of pavement.

英文关键词： asphalt pavement;numerical simulation;failure mechanism;meshless method;pavement mechanics