柔性路面加筋效果的影响因素分析

Influential Factor Analysis on Flexible Pavement Reinforcing Effectiveness

在交通荷载的反复作用下,粒料基层柔性路面会产生过量的塑性累积变形.将土工格栅置于基层和路基间,通过接触面摩阻力对基层施加侧向约束,抑制基层塑性变形发展,改善路基表面的应力分布.应用有限单元法探讨筋材拉伸模量、筋土界面摩擦系数对一土工格栅加筋柔性路面的接触面剪切特性和基层回弹应变、塑性应变沿加载中心线分布的影响.加筋后,基层底部受到的摩阻力增大,沿加载中心线的塑性应变显著减小.

Severe plastic accumulative deformation occurs with a repeated traffic loading on the aggregate-based flexible pavement. The geogrid at the interface of base and subgrade enforces lateral restraint to the base with the interface contact frictional force, the development of base plastic deformation is inhibited, and the vertical stress distribution on subgrade is improved. Based on the finite element method, this paper presents a discussion on the influence of geogrid tensile modulus and frictional coefficient on contact surface shear characteristics and base course resilient strain and plastic strain distribution of the geogrid-reinforced flexible pavement, which is along the centerline of loading area. Results show the frictional force at the bottom of the base is greatly increased, with the geosynthetic reinforcement, and the plastic strain of the base course along the centerline of loading area is decreased significantly.