Crack propagation behavior between base and surface courses of asphalt pavement based on weight function method
LI Ping
MAO Yu
NIAN Tengfei
MA Ke
Abstract：In order to study the reflection cracks and the crack propagation regularity of semi-rigid base asphalt pavement under traffic load,the stress intensity factor of the reflection crack is ana-lyzed and the fracture criterion of I-II mixed mode crack is established based on the theory of vis-coelastic fracture mechanics,using the weight function method.The influence that the structural layer thicknesses and the load position have on the reflection cracks within the base layer is ana-lyzed by numerical simulation.The crack propagation pattern within the surface layer is studied through single-edged notched beam test.The results show that the stress intensity factor of type I(KⅠ)and that of type II(KⅡ)are both greatly influenced by the structure thicknesses of pave-ment,and the type I crack propagation pattern plays a leading role when the road is under traffic load.It is also found that increasing the thickness of base layer has some effect on preventing re-flection cracks.When the horizontal load is taken into account,KⅠ and KⅡ all change with the change of load position,and with the increase of the distance between the load and crack,KⅠ gradually decreases,while KⅡ gradually increases,so the reflection crack gradually turn to type II crack propagation pattern.When the horizontal action is overlooked,the reflection cracks with-in the base layer appear in the form of I-II mixed pattern and extend to the surface layer under stress concentration,the extension mode of which is also shown as I-II mixed pattern.
Keywords：asphalt pavementsemi-rigid basereflection crackfracture mechanicsweight functionstress intensity factor
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 61-68 )