沥青路面动态模量及裂缝扩展规律分析

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中图分类号：U414 文献标志码：A 文章编号：2095-2945（2025）24-0099-04

Abstract：Inthisstudy，anumericalmodelofasphaltpavementwithcracksatthebottomofthebaselayerwasconstructed basedonABAQUS.Basedonthetheoryofelasticdynamicsandfracturemechanics，themechanicalresponsecharacteristicsof the stress concentration factors K1 and K2 of the cracked pavement under dynamic load of vehicles were analyzed，and compared with the static load test.The results show that K1 and K2 aresignificantly retarded under dynamic load，and K1 is 1.6 times that ofstaticloadduringcrackinitiation.Theinitialstageofcracksismainlyshearfailureunderstaticload，andcompositetensile and shear failure under dynamic load. During crack propagation， K1 first increases and then decreases，and K2 continuesto increase，with K1 and K2 dominant in the early and late stages respectively. Increasing the thickness and modulus of the base layercanefectivelyinhibitcrackpropagation.Theresearchrevealsthemechanismofcrackpropagationunderdynamicload， providestheoreticalsupportforpavementoptimizationdesign，andhasimportantguidingsignificanceforimprovingpavement performance.

Keywords： asphalt pavement; crack propagation; dynamic load; dynamic modulus; stress intensity factor

半刚性基层沥青路面因优异路用性能而广泛应用，其结构耐久性及裂损行为演化机理备受关注。（剩余4735字）