Numerical Simulation of Reflection Cracks in Asphalt Pavements Using Cohesive Zone Modeling
To study the expansion law of reflection cracks in asphalt pavement with semi-rigid base lay-er,combined with ABAQUS finite element software,the bilinear cohesive zone model was used to simulate the fracture process of semicircular bend test.The load-line displacement curve obtained from the simulation was compared with the test results to verify the applicability of the cohesive zone model in the cracking analysis.Then Winker foundation was simulated by using the spring element,and the cohesive zone model was applied in the finite element model to study the expansion law of reflection cracks in asphalt pavement.The result shows that:the bilinear cohesive zone model has good applica-bility in the cracking process of asphalt concrete.The semicircular bend specimen experiences elastic-ity,damage,and fracture three stages during the loading process.The peak load is 7.39 times of the initial damage point of the specimen.The damage elements are mainly concentrated in the lower part of the wheel print,and with the increasing loading displacement,the damage elements expand in all directions,and the elements gradually fail to form macroscopic cracks.Among the structural parame-ters of the pavement,the increase in the elastic modulus of the base layer and reaction modulus of the foundation is favorable for the surface layer to resist the expansion of reflective cracks,whereas the increase in the elastic modulus of the surface layer is not conducive to the resistance to the expansion of reflective cracks in the surface layer.
road engineeringreflection cracksemi-circular bend testcohesive zone modelnumeri-cal simulation
万方数据
维普
