Abstract: The anti-reflection-crack technology of graded gravel has a good effect on preventing the reflection crack of “white to black” pavement.The micro-bonded graded gravel was applied in the structure of “white to black” pavement.In order to study the dynamic response of composite pavement with anti-cracking interlayer under the moving constant load，a three-dimensional finite element model of asphalt overlay with anti-cracking interlayer was developed by ABAQUS.And the visco-elastic artificial boundaries were adopted in the model.The analysis results indicate that：the dynamic response of asphalt overlay can be significantly reduced by setting the micro-bonded graded gravel interlayer.According to the change rules of the maximum principal stress and the maximum shear stress at the joint bottom of asphalt layer，the asphalt overlay thickness of the interlayer is suggested to be 15cm.It can be more effective in anti-cracking，if the interlayer is set on the bottom layer with a better stiffness.The dynamic response of the asphalt overlay can be influenced by the modulus of the interlayer，to some extent.The minimum shear stress of the surface can be reached under the best modulus which is about 584 MPa.The thickness of the interlayer has little influence on the bottom layer shear stress of asphalt pavement，and the thickness of the interlayer is suggested to be 15 cm.

Key words: highway engineering, anti-cracking interlayer, composite pavement, dynamic response, visco-elastic artificial boundary

摘要： 级配碎石防反技术具有较好地防止“白改黑”路面反射裂缝的作用。将微黏结级配碎石引用到“白改黑”加铺结构中，通过建立ABAQUS三维有限元加铺结构模型，并采用黏弹性人工边界，分析了移动恒载作用下设置隔裂夹层的复合式路面动力响应。分析表明：设置微黏结级配碎石夹层可以显著减弱沥青加铺面层的动力响应；根据接缝处面层层底最大主应力与最大剪应力变化规律，建议设置夹层的沥青加铺厚度宜为15 cm；将夹层置于具有一定刚度的下卧层之上，更能发挥其隔裂效果；夹层模量在一定程度上影响着沥青加铺面层的动力响应特性，并且存在着一个最佳模量范围，约在584 MPa左右，使得面层的剪应力达到最小；夹层厚度对沥青加铺面层层底剪应力影响不大，建议夹层厚度设计在15 cm左右。

关键词: 道路工程, 隔裂夹层, 复合式路面, 动力响应, 黏弹性人工边界