Analysis Of Performance Distribution Characteristics Of Curved Section Of Road Bend In Mountain Area

The curved road section is an important part of the mountain road.This paper analyzes the relationship between the distribution characteristics of the road surface and the linear parameters and the driving behavior,which is of great significance to improve the traffic safety and pavement design and maintenance level of mountain road.Based on the analysis of the influence of road and environment on driving behavior,this paper chooses a mountain road in Chongqing as a test section,and constructs the depth value extraction experiment.First,the image acquisition method is calibrated and the image is corrected.Secondly,the gray scale mean of the sample is extracted according to the collected image,and the relationship between the gray point mean value and the construction depth value is established by genetic algorithm.Finally,the depth values of each detection point are extracted according to the relational model.In this paper,the characteristics of road surface performance distribution are analyzed from both horizontal and vertical aspects.In the analysis of the lateral distribution of road surface performance,it is the main factor to determine the curve radius to determine the horizontal distribution of the depth of the road table construction.Secondly,according to the horizontal distribution characteristics of the cross-sectional tectonic depth and the trajectory offset rate,the concept of tectonic depth transverse disaggregation and strip-type cross-section is proposed.Finally,the relationship between the road line parameters and the transverse distribution characteristics of the road surface is constructed,and the vehicle trajectory is analyzed.The results show that when R <50m,the chaotic cross section is mainly concentrated between the HY section and the YH section,and the distribution range increases with the radius,and gradually reaches the HY(YH)section from the QZ section.When 50 m <R <170m,The driver route selection is relatively consistent,but there is an invasion of the opposite lane behavior.When R> 170 m,the driver route selection first coincides,and the driving track and route consistency is higher.In the analysis of influencing factors of longitudinal distribution of road surface performance,it is the main reason to determine the change of velocity distribution.Secondly,the relationship between the track parameters and the longitudinal distribution of the road surface performance is analyzed,and the distribution characteristics of the road surface wear of different curved sections are determined.The results show that when R <130m and i <5%,the wear area of the curved section is mainly distributed between the ZH section and the HZ section,and the wear area of the road surface decreases with the increase of the radius and gathers to the QZ section.When R> 130 m,the wear area of the curved section is mainly distributed between the HY section and the YH section,and the wear area of the road surface decreases with the increase of the radius and gathers to the QZ section.According to the characteristics of the horizontal distribution of the road surface of the curved section,the loss characteristics of the pavement material are combined to provide theoretical basis for the design of the road section of the mountain road bend section and the key area of the key conservation area.Based on the characteristics of the horizontal distribution of road surface performance,the difference of driver ’s driving behavior between different curved sections is determined,which can provide theoretical reference for road traffic management and road safety design.