###### Abstract  
This study mainly uses PFC (particle follow code) to simulate the void characteristics of permeable asphalt mixture, and uses these to simulate the silting process. Then, a tire drop test was used to evaluate the noise reduction performance of permeable asphalt concrete. Finally, a self-made ring rutting test machine was used to simulate the silting process. Through experiments, the following conclusions were obtained: \(1\). The critical size of the sludge particle size is 0.3 mm-0.6 mm. 2. The quality of the water-permeable asphalt concrete specimens increased by 13% before and after silting, and the porosity of the specimens finally decreased from about 20% to about 8%. The water-permeable function only retained less than 20% of the original, and the water-permeable function was basically lost. 3. By measuring the road noise detection, it was found that the road noise is directly proportional to the degree of blockage of the permeable road. Compared with the original road with a perfect permeable function, the road noise of the completely blocked road increased by about 4 decibels. This study reveals the silting process of permeable asphalt mixture and the key particle size of the silt, which is of great significance for the detection, cleaning and maintenance of permeable asphalt pavements. p 202  
promotion of permeable pavements. [PERSON] [20] et al. analyzed the impact of the quality of permeable asphalt pavement plugging materials on the clogging performance, and concluded that as the service life of a permeable asphalt pavement gradually increases, the water permeability will decrease. Coarse sand particles did not significantly reduce permeability as these large particles did not enter surface pores [21; 22]. [PERSON] et al. found that silty clay and sand caused the most rapid clogging [23]. [PERSON] et al. [24] analyzed the silting problem of the permeable pavement in the use stage, and analyzed the particle size distribution of the blockage, and found that almost all sand particles were clay-like, and then proposed a solution to design a double-layer permeable asphalt pavement. [PERSON] [25] analyzed the water permeability mechanism. The silting behavior of a permeable pavement was simulated and analyzed, and the infiltration model of a permeable asphalt pavement is proposed. [PERSON] [26] further improved and analyzed the water permeability measurement device, and a simulated rainfall system was developed to explore the blocking behavior pattern. [PERSON] and [PERSON] [27] designed and prepared a constant head permeability test device, improving the epoxy resin sealing on the side of the test piece. By measuring the change of permeability coefficient of permeable asphalt mixture under the action of rain, the clogging effect is analyzed. Permeability is an important performance characteristic of permeable asphalt pavements, which can be determined by permeability tests. The testing method of porosity and the permeability coefficient of permeable asphalt pavements has always been the research focus of foreign experts. [PERSON] et al. [28] conducted a variable head penetration test and defined the head difference loss per unit time as the permeability coefficient to evaluate the water permeability of the permeable pavement. [PERSON] et al. [29] studied the measurement of the permeability coefficient. The permeability coefficient was measured by the on-site variable head permeability test and calculated based on the time required for the water flow to drop to the specified penetration depth. [PERSON] [30] et al. studied the permeable pavement of the large-gap expressway that has been in use all the year round. They believe that in the maintenance and repair of the permeable pavement plan, in order to determine the magnitude of the road hazard coefficient, a non-destructive testing method needs to be found. [PERSON] et al. [31] verified the maintenance effect of high-pressure washing on a permeable pavement.