Research on the Range of Asphalt Pavement Disease-Prone Area at Urban Intersection

The asphalt pavement disease-prone area refers to the areas where diseases such as ruts, cracks, and other diseases are prone to occur due to traffic channelization, repeated braking and stopping of vehicles at urban intersection, and the performance of asphalt pavement in this area is often poor. Taking several typical intersections in Changsha urban area as the research object, the multi-functional road condition rapid detection device was used to detect the outer second lane of each driving direction of intersection, and the pavement indexes including pavement surface condition index (PCI), pavement riding quality index (RQI), pavement rutting depth index (RDI), pavement surface wearing index (PWI), pavement bumping index (PBI), etc. were obtained with 10 m as the unit. The 35 sets of data obtained were normalized and analyzed in correlation. The pavement maintenance quality index (PQI) was calculated, and the probability distribution model was used to study the range of disease-prone area at urban intersection. The results show that all pavement indexes in the range of intersection decrease significantly. The length of the disease-prone area of the upstream lane of the stop line is significantly greater than that of the downstream lane. RDI has the strongest correlation with other indexes, and rutting is the most important disease form of asphalt pavement at intersection. The PQI conforms to the characteristics of Gumbel distribution model within the range of intersection. The PQI at 7.44 m away from the stop line of the upstream lane obtains a minimum value, and the maximum value of PQI is obtained at infinite distance from the stop line. The area in the first 40 m and back 125 m of the stop line can be identified as the disease-prone area.