重载条件下沥青路面按弯沉等效的轴载换算

Axle Load Conversion Formula Based on Deflection Equivalent for Semirigid Base Asphalt Pavement under Heavyload

重轴载高胎压是目前我国干线公路上重要的交通荷载条件。基于调查的重载交通轴载、胎压的组成特点,考虑干线公路路面典型结构及其材料的非线性性质,计算得到不同重轴载下、不同轮胎接地压强的理论弯沉。利用理论弯沉与轴载的关系,通过综合弯沉修正系数,按弯沉等效原则,得出在实际重轴载、高胎压条件下,考虑材料非线性的半刚性沥青路面的轴载换算指数公式,并通过实际工程测试得到了验证。进一步分析表明,在反应不同接地压强轮胎对路面损坏的不同和对轴载换算系数的影响方面,现容许弯沉公式存在不足,本文依据调查的重轴载作用特点和有关文献资料,提出了适于重载的容许弯沉公式修正式。

Based on the investigation of compostion of the heavyloads which are the main load form to the mainline road,and on the nonlinear elastic property of the road material,the theoretic deflection under different heavy axle loads and different tyre pressure were calculated.By the synthetical corrective coefficient of deflection and the deflection equivalent principle,this paper analyzed the axle load conversion index under different heavyloads,and the result has been validated by practical project.Further analysis indicated that the present deflection formula is deficient in terms of road damage under different tyre pressure,and the paper proposes a modified formula for the heavyloads according to investigated data.