低交通量公路柔性路面粒料基层抗剪性能分析

Analysis of shear performance of granular sublayer in flexible pavement of low-traffic highway

剪切破坏是低交通量公路粒料基层柔性路面主要破坏形式.根据散体力学粒料最危险剪切滑移面不是剪应力最大的面,而是剪应力与正应力比值最大的面为理论依据提出剪应力验算公式;基于弹性层状体系理论确定最危险剪切面位置;分析路面结构不同深度最危险剪切面上剪应力与正应力比值随深度的变化规律;从保证抗剪性能出发确定粒料基层顶面的合理位置.

The shearing destruction is the main form of destruction of the flexible pavement with granular sublayer of low-traffic highway.Based on the granular mechanics,the most dangerous slip-shear surface is not the one with maximum shearing stress but the one with maximum ratio of shearing stress to normal stress,which is computed with the checking formula for shearing stress.The position of hazardous slip-shear surface was determined according to multi-layer elastic system theory;the variation pattern of the ratio of shear stress to normal stress on the most dangerous shear plane was analyzed for different pavement depth.The rational position of granular sublayer was determined for the flexible pavement to ensure its shear resistance performance.