Research On The Key Parameters Of Asphalt Pavement Performance Based On Physiological And Psychological Factor

Traffic safety and driving comfort are the key performances to reflect pavements service quality, and they are respectively determined by skid-resistance performance and roughness of asphalt pavements. In the world, in order to control road service quality, standards for acceptance and evaluation of the two parameters are accordingly established.Through analyzing literature associated with evaluation standards of asphalt pavement roughness from the original to the present revision as well as the utilize process of standards, it is found that asphalt pavement roughness evaluation criteria are developed based on expert scoring. Although expert scoring originates from testers' subject feelings, the scoring is strongly affected by personal factors, such as sex, age, physical condition, emotional state and many other factors, and then the findings are quite different between different testers. So it is difficult to describe asphalt pavements' service quality objectively and quantitatively. In fact, the essence of riding comfort is the crew's physiological and psychological reactions to the riding vibration caused by road surface roughness. With the globalization increase of the humanities philosophy and the acquired research results and findings at related areas, an experimental study on the relationship between physiological and psychological indicators of the crew and asphalt pavement roughness is intensively carried on in this dissertation.Anti-sliding standards of asphalt pavement from the beginning to the follow-up amendments are all directly or indirectly derived from the statistical analysis results between rainy traffic accidents' number and skid-resistance friction capacity. It is undeniable that rainy road traffic accidents are close related with skid-resistance capacity, but the rainy traffic accidents data is difficult to be collected and it is more difficult to define whether the incentive for the accident is due to insufficient pavement skid-resistance capacity. As the subjective factors, drivers have greater responsibilities in traffic accidents in the man-vehicle-road system, and driver's perceptions to pavement anti-slide performance affect driver's judgments and manipulation capabilities. In order to quantitatively describe pavement anti-slide performance by driver's perception, it is necessary to study the relationship between driver's physiological and psychological indicators and pavement skid-resistance capacity.This dissertation is supported by National Natural Science Foundation of China project (GM: 50522201):"Research on interaction between road surface performance and traffic safety". Based on a large number of indoor simulation experiments and field trials and with the assistance of the collected expressway asphalt pavements roughness data, research work has been carried on by the aid of the statistical analysis methods which are fit in the characteristics and rules of road data, physiological and psychological signal and vibration signal.The main conclusions are: 1) A new RQI (Riding quality index) evaluation system comprised of three indicators, such as IRImean(Mean of International Roughness Index), skewness value and kurtosis value, is put forward, that is, when the three indicators of road surface roughness lie in the same RQI rating range, the RQI score of the road can be determined by this rating level. When the three indicators lie at various RQI rating ranges, the RQI score is determined according to the most adverse condition. 2) An univariate anti-sliding performance decay trend curve of asphalt pavement is acquired based on such similar factors as climate, construction, materials and construction technique etc. 3) It is proposed that asphalt pavement roughness has an effect on human ECG(Electrocardiogram), and then a comfort threshold of asphalt pavement roughness is acquired based on human ECG indicators. 4) It is proposed that asphalt pavement anti-slide performance has an effect on human transcutaneous electricity, and then a driving safety threshold of asphalt pavement skid-resistance performance is acquired based on human EDA(Electrodermal Activity)indicators. 5) An analysis method of human physiology and psychology data is put forward based on the theory of time-series and Fourier transform.At present, no evaluation and maintenance standards of asphalt pavement performance have been built based on occupants' physiological and psychological indicators. In the process of establishing pavement evaluation and maintenance threshold, taking human factor as a determinant factor not only opens up a new research area of pavement performance, but also reflects human philosophy hid in pavement performance evaluation. So this research will promote sustainable development of road-building and provide it a favorable technical support and a theoretical basis.