基于弹塑性损伤理论的水泥稳定碎石基层开裂的数值模拟研究

Numerical Simulation Study on the Cracking of Cement Stabilized Macadam Based on Elasto-plastic Damage Theory

沥青路面水泥稳定碎石基层的开裂是一个非常复杂的问题,决定了路面结构的开裂程度。水泥稳定级配碎石作为一种典型的准脆性材料,在拉伸载荷的作用下表现出准脆性力学特性,但是在受压或围压较高时表现出塑性损伤特征。基于弹塑性损伤理论对沥青路面基层进行理论分析,并应用ABAQUS软件,对水泥稳定碎石基层裂缝的数值模拟进行研究,并分析使用初期基层的开裂规律和影响因素。结果表明,在干缩和温缩的耦合作用下,基层会出现间距约为45m的横向裂缝;温缩作用对基层会造成一定程度的损害,但不会导致横向裂缝。

The cracking of cement stabilized macadam subgrade of asphalt pavement is a very complicated problem,which determines the degree of cracking of the pavement structure. As a typical quasi brittle material,Cement Stabilized Graded Crushed Stone exhibits quasi brittle mechanical behavior under tensile loading,but exhibits plastic damage characteristics when compression or confining pressure is higher. In this paper, the elastoplastic damage theory analysis of Asphalt Pavement Based on,and using ABAQUS software,numerical simulation was carried out to study the crack of cement stabilized macadam base,and the use of early cracking rules and influence factors of the primary analysis. The results show that the technical measures in the process of curing are very effective for dealing with cracks in cement stabilized macadam base course. In the coupling of dry shrinkage and temperature shrinkage,there will be transverse cracks about 45 m spacing. The single temperature shrinkage effect will have some damage to the base,but will not lead to transverse cracks.