沥青混合料动水破坏行为与动力渗水试验模拟

Dynamic water damage behavior and dynamic seepage test for asphalt mixture

针对沥青混合料动力渗水研究的不足,揭示沥青混合料动力渗水行为,采用快速Lagrange有限差分法对沥青路面的动水破坏行为进行数值模拟;利用自行研发的多功能沥青混合料动态渗水试验仪对AC-13与AC-20沥青混合料进行动力渗水试验,探讨了2种沥青混合料空隙率与渗水系数的关系。研究结果表明：动水产生的泵吸作用是沥青路面水损坏的诱因;动力渗水系数随空隙率（或水压力）的增加逐渐增大,最终趋于稳定;对动力渗水试验数据进行回归,得到了AC-13与AC-20这2种混合料动力渗水系数与水压力、空隙率的关系;与静力渗水系数相比,动力渗水系数更符合试验结果,建议将31~40mL/s的动力渗水系数作为沥青混合料渗水的临界评价指标。

In order to make up the deficiencies in studies of the dynamic water seepage of asphalt mixture,and reveal the behavior of dynamic water seepage of asphalt mixture,the hydrodynamic destruction behavior of asphalt pavement was simulated by using the fast Lagrangian finite difference method.Then a self-developed dynamic multi-function asphalt water seepage tester was used to do the water seepage test for AC-13 and AC-20 asphalt mixture,and the relationship between the voids in asphalt mixtures and water permeability was discussed.The results show that：the reason of asphalt pavement water damage is the pumping effect caused by the hydrodynamic pressure;dynamic water seepage coefficient increases as porosity power（or water pressure）increases,and ultimately tends to be stable;the regression of the dynamic seepage test data is carried out,and the relationship between dynamic water seepage coefficient and water pressure and porosity of AC-13 and AC-20 asphalt mixture is showed;compare with static water seepage coefficient,the dynamic seepage coefficient is more realistic.Thus the dynamic seepagecoefficient 31-40mL/s is recommended as a critical evaluation of the seepage of asphalt mixture.