论文部分内容阅读
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。
Aiming at the insufficiency of dynamic seepage study of asphalt mixture, the dynamic seepage behavior of asphalt mixture is revealed. The dynamic Lagrange finite difference method is used to simulate the dynamic water damage of asphalt pavement. By using the self-developed dynamic asphalt seepage tester The dynamic seepage test of AC-13 and AC-20 bituminous mixtures was carried out, and the relationship between the void fraction and seepage coefficient of the two kinds of bituminous mixtures was discussed. The results show that the pumping effect of moving water is the inducement of water damage of asphalt pavement. The dynamic water seepage coefficient increases with the increase of void ratio (or water pressure) and finally stabilizes. The data of dynamic seepage test are regressed to obtain The relationship between dynamic water seepage coefficient and water pressure and void ratio of AC-13 and AC-20 were compared. Compared with the static water seepage coefficient, the dynamic water seepage coefficient was more in line with the experimental results. It is suggested that the dynamic power of 31-40 mL / s Permeability coefficient as a critical indicator of asphalt mixture seepage.