层间接触对沥青加铺层性能的影响

Effect of Bond Condition on Overlay Performance

通过选取古德曼模型,基于弹性层状体系理论对不同层间接触情况下沥青加铺层受力及变形规律进行分析,研究了考虑水平力时层间接触对加铺层的影响.研究结果表明:层间接触不良会导致加铺层弯沉、拉应力变大;不同界面的层间接触变化对加铺层表弯沉影响程度相差不大,但对拉应力影响程度不同;水平力大小对加铺层底拉应力影响不大,但对加铺层表拉应力影响较大;不同层间接触对加铺层剪应力影响与水平力大小有关.在进行加铺设计、施工时候必须考虑层间接触对加铺层性能的影响.

The Goodman model was introduced to analyze the overlay performance, taking into account different degrees of interface bond based on the elastic multi-layer system. And then, the consequences of interface bond on overlay performance were analyzed when considering a horizontal load in addition to the standard vertical dual load. The results have indicated that the poor interface bond can increase deflection and tensile stress, the influence of deflection by the change of bond is almost the same, but the tensile stress is quite different. Horizontal load has some effect on the bottom of overlay＇s tensile stress, but as a more important effect on surface tensile stress, the effect of bond condition on shearing stress changes with different horizontal loads. More attention should be paid to the interface bond during overlay design and construction.