【作者】 刘丹丹；

【导师】 戴文亭；

【作者基本信息】 吉林大学 ， 交通运输工程（专业学位）， 2022， 硕士

【摘要】 透水沥青路面对雨水发挥了超强的“渗”和“蓄”的作用,目前主要用于城镇道路、广场和停车场等处。但路表沉积物与降雨形成混合流不断进入空隙内部,逐渐形成淤塞,透水功能不断衰减,甚至全部丧失。国内当前的研究和施工重点都在于如何实现更好的透水效果,却忽视了海绵体淤塞的综合防控关键技术的研究。以往研究表明,任何清洁技术都只能有效去除表面3mm内的堵塞物,路面将持续堵塞,且工作量大,成本高,这限制了透水沥青路面的广泛应用。本文依托吉林省科技厅项目《海绵城市建设中透水路面淤塞综合防控关键技术研究》,提出了小粒径小空隙大空隙率防淤层的双层透水沥青路面。基于分形级配理论设计并拟选4个防淤层级配,通过透水试验、室内淤塞试验和路用性能试验对各级配效果进行评价,然后对级配进行优化。将不同厚度比下的级配为S(PAC5)和C(PAC5)的有效防淤层与级配为F(OGFC16)的承载层粘结,验证所设计双层透水沥青路面的路用性能、双层抗剪性和抗滑性。通过室内试验,分析防淤层的不同级配以及不同的双层厚度比对透水性能、防淤性能和路用性能影响。最后采用离散单元方法,通过PFC3D建立不同级配情况下的透水沥青路面颗粒渗入数值模型和透水路面中淤塞物与水的混合流淤塞模型,并通过模拟淤塞过程研究拟选级配对淤塞的预防效果,直观地看到了淤塞物空间分布与各级配混合料空隙分布特征等,确定了拟选级配的防淤能力。研究结果表明,优化后确定的最佳级配S作为有效防淤层,能够保证透水性和路用性能;双层透水沥青路面的最优组合方式为厚度为2cm的级配S作为防淤层,与厚度为4.35cm的级配F作为承载层粘结。更多还原

【Abstract】 Permeable asphalt roads play a super role in "infiltration" and "storage" in the face of rainwater.At present,it is mainly used in urban roads,squares and parking lots.However,the mixed flow formed by surface sediment and rainfall continuously enters the interior of the pores,gradually forming blockage,and the permeability function is continuously attenuated or even completely lost.The current domestic research and construction focus on how to achieve better water permeability,but ignore the research on the key technology of comprehensive prevention and control of sponge siltation.Previous studies have shown that no matter what cleaning technology can only effectively remove the blockage within 3mm of the surface,the pavement will continue to be blocked,with heavy workload and high cost,which limits the wide application of permeable asphalt pavement.Based on the project of Jilin Provincial Department of science and technology "Research on Key Technologies of Comprehensive Prevention and Control of Permeable Pavement Congestion in Sponge City Construction",this paper puts forward a double-layer permeable asphalt pavement with small particle size,small gap and large porosity.Based on the fractal grading theory,four anti-silting layers are designed and planned to be selected.The effect of each layer is evaluated through water permeability test,indoor siltation test and road performance test,and then the grading is optimized.The effective anti-silt layer with grade S(PAC5)and C(PAC5)and the bearing layer with grade F(OGFC16)are bonded according to different thickness ratios to verify the road performance,shear resistance and slip resistance of the designed double-layer permeable asphalt pavement.The effects of different gradation and double layer thickness ratio on water permeability,silt prevention and road performance were analyzed through laboratory tests.Finally,the discrete element method is used to establish the particle infiltration numerical model of permeable asphalt pavement under different gradation and the mixed flow siltation model of silt and water in permeable pavement through PFC3 D,and the preventional effect of proposed grade matching siltation is studied by simulating the siltation process.By this method,the spatial distribution of silting material and pore distribution characteristics of different gradation mixtures can be seen intuitively,and the anti-silting ability of planned gradation can be determined.The results show that the optimal gradation S can be used as an effective anti-silting layer to ensure the water permeability and road performance.The optimal combination mode of double-layer pervious asphalt pavement is that the gradation S with a thickness of 2cm is used as the anti-silt layer,and the gradation F with a thickness of 4.35 cm is used as the bearing layer.更多还原