全厚式长寿命沥青路面轴载换算方法研究

以弹性层状体系理论为基础,结合壳牌土基容许顶面压应变公式,推导得到基于路基顶面压应变等效时轴载换算公式。应用路面结构计算程序Apbi,计算不同轴载、不同胎压作用下路基的顶面压应变。根据轴载换算等效原则。计算了基于路基顶面压应变的全厚式长寿命沥青路面结构在不同轴重、不同胎压下轴载换算指数。结果表明,不同胎压、不同轴重等情况对轴载换算指数的影响较小,各种情况下轴载换算系数的平均值为0.988;计算得到基于路基顶面压应变的轴载换算指数为4.94。分析结果可为今后全厚式长寿命沥青路面轴载换算指数的取值提供参考。

Study on Conversion Method of Axle Load for Full Thick Long-Life Asphalt Pavement

The paper derived the axle load conversion formula based on equivalent compressive strain on top of subgrade,combining the formula of SHELL compressive strain on top of subgrade allowance and the layer - elastic theory.Applying the pavement structure calculation program Apbi,the compressive strain on top of subgrade under different axle load and tyre pressure was calculated.Based on the equivalent principle of axle load conversion,the axle load conversion index of full thick long - life asphalt pavement was calculated.The results showed that the value of axle load conversion index influenced by different tire pressure and axle load changes little,and the average of axle load conversion index in all cases was 0.988;the axle load conversion index based on compressive strain on top of subgrade was calculated by 4.94,The analysis results could be used as reference for the determining value of axle load conversion index with the full thick long - life asphalt pavement design.