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为探索夹层位置在加筋沥青混凝土加铺层中的抗开裂工作机理,首先分析沥青混凝土加铺层常见开裂形式及其产生机理,然后建立有限元模型,将夹层位置分为5种情况,同时考虑旧路有、无裂缝,研究了夹层位置对夹层上下沥青混凝土加铺层结构荷载内力及温度内力影响的规律。结果表明:在交通荷载作用下,随着格栅位置的上移,格栅之上加铺层的竖向剪应力存在一最小值,在此处对防治TDC开裂最佳,从抗反射裂缝及BUC开裂的角度来看,格栅夹层越靠近加铺层层底越有利;在温度荷载作用下,格栅设于加铺层层底,加铺层层底拉应力、拉应变及竖向剪应力最小,格栅设置与否并不影响格栅之上加铺层的拉应力、拉应变,从抗温度作用下的弯拉反射裂缝及BUC开裂的角度来看,建议将格栅设于加铺层层底。
In order to explore the mechanism of anti-cracking in reinforced asphalt concrete overlay, the common cracking patterns and their mechanism of asphalt overlay are analyzed. Then, the finite element model is established, and the sandwich position is divided into five cases. Considering the existence of cracks in the old road, the law of the influence of interlayer location on the internal forces and internal forces of the asphalt overlay on the upper and lower mezzanine floors was studied. The results show that under the action of traffic load, the vertical shear stress of the overlay on the grille has a minimum value as the position of the grille moves up. Here, the crack prevention and cure of TDC is the best. BUC cracking point of view, the closer the grid interlayer to the overlay layer of the more favorable; under temperature load, the grid is located in the overlay layer at the end of the layer, the layer of tensile stress, tensile strain and vertical shear The stress is minimum, the grille setting or not does not affect the tensile stress and tensile strain of the overlay on the grille. From the perspective of flexural reflection cracking and BUC cracking under temperature resistance, it is suggested to set the grille in plus Shop floor.