Study On Driving Load Characteristics Of Expressway Reconstruction And Extension Pavement Construction

During the reconstruction and expansion of the highway pavement in the construction phase,there are complex construction zone environments such as reordering environments and interweaving environments.There is a potential safety risk when driving in half-width construction and half-driving situation.In order to explore relationships among the driving risk,driving load characteristics,and influencing factors of the highway reconstruction and expansion construction area,this dissertation uses the continuous data of 16 drivers during natural driving to collect the vehicle motion parameter speed,lateral acceleration,and longitudinal acceleration data;the driver operation parameter includes steering wheel Angle,throttle,brake;and vehicle offset parameters include deviate from the left lane and the distance from the right lane;vehicle follow-up parameters include headway,target longitudinal distance in the same lane,target lateral distance in the same lane,target width in the same lane.Then,the characteristics of the driving parameters of different construction bids and different driver characteristics are analyzed.Most of the driving parameters have significant changes.Physiological parameters were used to improve the heart rate growth rate to measure the driving load level,and the linear correlation between driving parameters and driving load levels was analyzed,too.The feature selection algorithm was used to calculate the observed values of the t test statistics of each driving parameter and the corresponding probability p value.The magnitude and correlation of p-values are selected in the four dimensions of driving motion,operation,offset,and following the vehicle to establish a driving load prediction model for the highway reconstruction and expansion construction area.Furthermore,this dissertation establishes a risk assessment model based on driving load for the reconstruction and expansion of highways based on the driving time of the following parameters.The driving parameters are obtained based on the relationship between accident risk and driving load and the relationship between driving load and driving parameter factors.Based on the factors above,impact on accident risk can be measured.This dissertation also establishes a risk assessment grading mechanism for the construction area using an optimization model without specific objective functions.The research results show that the driving parameters of the driver have a significant linear relationship with the driving load and the headway.The selection of the driving load control coefficient has a restrictive effect on the driving parameter.When the driving load control coefficient m decreases,the driving speed and steering wheel angle and the distance from the right lane need to be kept within a small change interval.In ensuring a reasonable level of driving load,controlling the uniformity,continuity,and speed balance of the driving trajectory,maintaining the driving direction,and appropriate lateral headroom can improve the driving safety of the reconstruction and expansion of the highway and avoid potential collision risks.Based on the risk assessment model for driving load accidents,this paper presents the recommended interval for changing the driving parameters of highways with different driving load control coefficients.That is,when the driving load control coefficients m = 2 or 3,the driving load has no constraint on the distance from the right lane.In this case,the distance of the parameter from the right lane is restricted by the headway.When the vehicle deviates from the right lane by more than 2.6m,the driver can maintain a better headway.When the driving load control coefficient m = 1,the distance from the right lane cannot be greater than 6.4m.At this time,the recommended range of vehicle speed is 77.8-77.9km / h,and the recommended range of steering wheel angle is-13.9-9.7°.