车轮荷载下路基和基底竖向应力计算

Calculation of Vertical Stress in Subgrade and Foundation Base Under Wheel Load

在标准交通荷载作用的前提下,考虑非标准交通荷载和路基填土密度的变化,分别计算了集中轴载和均布轴载作用下路基和基底内竖向附加应力和总应力。计算均布交通荷载下路基内应力时,考虑了由于路面材料和路基材料抗压模量差异引起的应力扩散角的存在;计算基底内应力时,将路基作为条形基础,对路基中心下基底内不同深度处的应力进行了计算。计算结果和思路可为验证特殊交通荷载(如超载)下特殊填料(如软岩、风化岩、人工材料等)的承载能力提供理论参考。

On the premise of the standard wheel loads, considering the variations of the non-standard traffic loads and the backfill density, the vertical stress in subgrade and foundation base are calculated under concentrated wheel load and distributed wheel load. Because of the compressive modulus difference between pavement material and subgrade backfill, the spread angles of stress are considered when calculating the vertical stress. When calculating the foundation base vertical stress under the subgrade center, the subgrade is regarded as strip foundation. The ideas and results of the calculation can provide a theoretical reference to verify the bearing capacity of the special filler （such as soft rock, weathered rock, artificial materials, etc. ） under the special traffic loads （such as overloading）.