基于非达西渗流定律的沥青饱水路面结构动力特性研究  

Dynamic Characteristics of Asphalt Saturated Pavement Based on Non-Darcy Seepage Law

作　　者：宋福春[1] 白祥鸽 SONG Fuchun;BAI Xiangge(School of Transportation and Geomatics Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学交通与测绘工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2023年第1期97-103,共7页Journal of Shenyang Jianzhu University：Natural Science

基　　金：“十三五”国家重点研发计划重点专项基金项目(2018YFC0809600,2018YFC0809606);辽宁省重点研发计划指导计划基金项目(2018416028);沈阳市建委城乡系统科研项目(201904)。

摘　　要：目的 提出考虑非线性渗流定律的沥青饱水路面模型,对其结构力学性能进行研究,为道路结构排水设计提供参考。方法 利用COMSOL有限元软件,对动荷载作用下的路面结构进行有限元建模,分析动荷载下Forchheimei非线性渗流时饱水沥青路面的动孔隙水压力、水平应力以及剪切应力的变化,并通过正交试验探寻轮载峰值、孔隙率、弹性模量三种变量参数对沥青路面结构的动孔隙水压力的影响。结果 动孔隙水压力在动荷载的作用下先到达正向峰值后逐渐减小至出现负向峰值后慢慢减小至平稳;水平压应力在动荷载的作用下随着结构层的深度增加而减小;剪切应力随着荷载的增加而增加,随着荷载的减小而减小。由正交试验结果可得,轮载峰值对沥青饱水路面动孔隙水压力的影响呈正相关特征,而孔隙率、弹性模量呈负相关特征。其中考虑轮载峰值时,沥青饱水路面的最大动孔隙水压力均值增幅最大,达56%。结论 数值模拟结果验证了结构层内正负水压力随时间交替存在,证实了水损害过程中的泵吸作用,非线性渗流对沥青面层的冲刷作用较强;动孔隙水压力受轮载峰值的影响较大,孔隙率对其影响次之,弹性模量影响最小。To propose put forward the asphalt saturated pavement model considering the nonlinear seepage law, the mechanical properties of its structure were studied, which can provide reference for the design of road structure drainage.COMSOL finite element software was used to model the pavement structure under dynamic load, and the changes of dynamic pore water pressure, horizontal stress and shear stress of saturated asphalt pavement under dynamic load were analyzed.Through orthogonal test, the influence of three variables on dynamic pore water pressure of asphalt pavement structure is explored.Under the action of dynamic load, the dynamic pore water pressure first reached the positive peak and then gradually decreased to the negative peak.The horizontal compressive stress decreases with the depth of the structural layer under the action of dynamic load.Shear stress increases with the increase of load and decreases with the decrease of load.According to the orthogonal test results, the influence of wheel load peak on dynamic pore water pressure of asphalt saturated pavement is positively correlated, while the porosity and elastic modulus are negatively correlated.When the peak of wheel load is considered, the mean value of the maximum dynamic pore water pressure on the asphalt saturated surface increases the most, reaching 56%.The numerical simulation results verify the alternating existence of positive and negative water pressure in the structural layer with time, and confirm the pumping action in the process of water damage.Nonlinear seepage has a strong scouring effect on asphalt surface.The dynamic pore water pressure is greatly affected by the peak of wheel load, followed by the porosity, and the elastic modulus.

关 键 词：道路工程 动孔隙水压力 沥青饱水路面 Forchheimei型非达西渗流定律 

分 类 号：TU411[建筑科学—岩土工程]