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在旧路面上铺筑微表处层后,旧路面的强度和开裂情况对微表处层的受力状况有着很大的影响。基于断裂力学理论,通过有限元软件对微表处层应力强度因子进行了计算分析,结果表明:微表处层不存在张拉型开裂,主要受剪切模式影响;随着面层模量的降低,微表处层应力强度因子增大,当模量降低至路面强度的75%后,应力强度因子增大幅度更快,基层对微表处层应力强度因子影响甚微;旧路裂缝深度对微表处应力强度因子影响显著,旧路裂缝深度超过基层后对微表处寿命影响较大;旧路裂缝宽度极小时容易导致微表处裂纹处应力集中,裂缝宽度太大后会导致微表处产生更多的开裂,选择2~6mm旧路裂缝宽度时进行微表处养护比较合适。
After paving the micro-surfacing layer on the old pavement, the strength and cracking of the old pavement have a great impact on the stress state of the micro-surfacing layer. Based on the theory of fracture mechanics, the stress intensity factor at the micro-surfacial layer was calculated and analyzed by finite element software. The results show that there is no tensile cracking in the micro-surfacial layer, which is mainly affected by the shear mode. With the increase of the surface modulus When the modulus decreases to 75% of the pavement strength, the stress intensity factor increases more rapidly, and the grassroots have little effect on the stress intensity factor at the micro-surfacing layer. The depth of the old road crack The influence of the stress intensity factor on the micro-surfacing is significant. The crack depth of the old road has a greater impact on the life of the micro-surfacing. When the width of the old crack is very small, the stress concentration will be easily caused at the micro-surfacing crack. More cracks generated at the table, select the width of 2 ~ 6mm cracks in the old road when the micro-table conservation more appropriate.