模量对反射裂缝应力强度因子影响分析

Impact Analysis of Modulus on Stress Intensity Factor for Reflective Crack

为了研究模量对反射裂缝应力强度因子的影响,应用有限元软件ABAQUS建立了含反射裂缝的路面模型,分析了当路面各结构层模量变化时裂缝尖端应力强度因子的变化情况.计算表明:模量变化对反射裂缝应力强度因子影响较大,裂缝尖端应力强度因子随着面层各层位模量的增加而增大,随着基层各层位和土基模量的增加而降低.其中土基模量变化对裂缝尖端应力强度因子的影响最大.对于面层和基层各层位,距离裂缝越近,则其层位模量变化对应力强度因子的影响也越大.

In order to study the Impact of modulus on stress intensity factor for reflective crack , the chan-ges of stress intensity factor for the crack tip were analyzed using the finite element software ABAQUS to establish pavement model with reflective crack , when the modulus for each layer of pavement changes .Calculations show that the change of the modulus has great influence on the stress intensity factor , the stress intensity factor of crack tip increases with the increase of the modulus for surface layers , and the stress intensity factor of crack tip de-crease with the increase of the modulus for base and subgrade .The modulus change of subgrade has the greatest influence on stress intensity factor of the crack tip .The closer the crack and the layer of the surface and base get, the greater influence for stress intensity factor with the change of modulus .