半填半挖式路基差异沉降对沥青路面结构影响分析

The influences of the asphalt pavement deformation due to the differential subgrade settlements

半填半挖式路基的差异沉降将对上承路面结构产生不利的附加力学响应。本文以层状体系为基础,将半填半挖式路基差异沉降变形作为路面结构层底的约束条件,建立沥青混凝土路面结构对半填半挖式路基差异沉降变形力学响应的平面有限元模型。系统分析不均匀沉降量、不均匀沉降长度、路面结构与材料参数等对附加力学响应的影响。通过正交因子分析,研究路面结构层的优化设计以改善路面结构的不利受力状态。最后,建议使用柔性基层或设置级配碎石等松散性材料底基层来削减基层底附加拉应力,在路面结构层的优化设计中应以基层厚度作为控制要素。

Based on elastic layer system, a plane strain finite element model, which may compute the additional stress of asphalt pavement, is drawn to analyze the influences of the asphalt pavement deformation due to the differential subgrade settlements. Such as differential settlement value, length and pavement structure parameters are analyzed. Furthermore some advice to avoid early distress is advanced.