分层梯度模量微沥青级配碎石对倒装式路面结构的影响

Effect of Micro-Asphalt Macadam of Graded Gradient Modulus on the Inverted Pavement Structure

利用ABAQUS有限元软件,建立倒装式沥青路面结构模型,研究了多轴载情况下级配碎石横观各向同性特征对路面结构的影响,并通过设置分层梯度模量的微沥青级配碎石对倒装式路面结构进行结构优化。研究表明:级配碎石横观各向同性特征明显影响着倒装式路面结构的内部应力与应变,影响到路面的使用寿命,在实际工程中不可以忽略;设置分层梯度模量的微沥青级配碎石层可减少层间的模量比、形成缓冲区,以缓解级配碎石横观各向同性特征所带来的影响,尤其在重载交通条件下,设置逆向梯度模量的微沥青级配碎石后,其路用关键性指标可减小20%以上。

The model of the inverted asphalt pavement structure was established by finite element software ABAQUS. The influence of transversely anisotropy of graded aggregate on the pavement structure under multi-axle load was studied. And the inverted pavement structure was optimized by setting the hierarchical gradient modulus of micro-asphalt graded gravel. The results show that： the transversely anisotropy of micro-asphalt graded gravel has an obvious effect on the internal stress and strain of the inverted asphalt pavement structure as well as the service life of the pavement,which can＇t be ignored in the actual project; the modulus ratio among layers can be reduced by setting the hierarchical gradient modulus of micro-asphalt graded gravel to form a buffer,in order to alleviate the influence of the transversely anisotropy of micro-asphalt graded gravel; especially in the heavy traffic conditions,the key indicators of road performance can be reduced by more than 20%by setting the transversely anisotropy of micro-asphalt graded gravel.