不同层间结合状态下刚柔复合式路面的剪应力分析

Analysis of Shear Stress of Rigid-flexible Composite Pavement under Different Interlaminar Bonding Conditions

为了研究层间结合状况对复合式路面剪应力的影响,利用Bisar3.0软件对标准荷载作用下刚柔复合式路面的剪应力进行了计算分析。通过选取合理的ALK(简化弹性柔量系数)来模拟路面的3种层间结合状况,并考虑了温度对应力分布的影响。计算结果表明:荷载中心位置是最大剪应力最有可能出现的位置;层间结合状况越好,层间最大剪应力值越小,且层间剪应力突变越小,对路面越有利;温度越高,层间剪应力会略微变小,但是温度对剪应力的影响有限;通过合理的层间处理技术可以提高层间抗剪强度并减小剪应力与应力突变,能有效地避免层间剪切破坏。提出了对现有复合式沥青路面抗剪设计的改善意见。

In order to study the effect of interlaminar bond condition on shear stress of composite pavement, Bisar 3.0 is used to analyze the shear stresses in rigid-flexible composite pavement under standard loads. Proper ALK （ simplified elastic compliance coefficient） is selected to simulate 3 kinds of road interlaminar bond condition, and effect of temperature distribution is also taken into consideration. The calculation result indicates that （ 1 ） the maximum shear stress most likely appears at the center of loading area ; （ 2 ） better interlaminar bonding condition means smaller interlaminar shear stress, and smaller interlayer shear stress mutation is beneficial for pavement; （3） as temperature rises, the shear stress would slightly decreases, but the effect of temperature is limited; （4） proper interlaminar treatment not only can increase shear strength but also can reduce shear stress and stress saltation to avoid interlayer shear failure. The improvement on anti-shear design for composite asphalt pavement is proposed.