非洲沥青路面开裂的动力学分析及路面质量控制研究

The Dynamic Analysis and Quality Control to Asphalt Pavement Cracking in Africa

以乌干达某市政道路工程为例,基于断裂力学理论,取不同车速、面层动弹模和沥青路面裂纹长度3个因素,选取3水平进行正交试验,并运用有限元模拟计算正交设计方案的裂纹应力强度因子。结果表明:裂缝长度对裂缝的扩展影响最大,其次是车速对裂缝扩展的影响较大,而面层的弹性模量对裂缝扩展的影响最小,远小于裂缝长度的影响,且裂纹应力强度因子随着面层弹性模量的增大而增大。在此基础上,提出了在施工、运营和维护阶段为减少裂缝扩展导致路面破坏的建议。

Taking a municipal road project in Uganda as an example,based on the theory of fracture mechanics,three factors,i.e.different speed,dynamic modulus of surface layer,and crack length of asphalt pavement,are selected for orthogonal test.The crack stress intensity factors of orthogonal design scheme are calculated by finite element simulation.The results show that the crack length has the greatest influence on the crack growth,and the speed has the greater influence on the crack growth,while the elastic modulus of the surface layer has the least influence on the crack growth,which is far less than the crack length,and the stress intensity factor of the crack increases with the increase of the elastic modulus on the surface layer.On the basis of the analysis,some suggestions are put forward to reduce the pavement damage caused by crack propagation in the construction,operation and maintenance stages.