Study On The Variation Law Of The V-shaped Undersea Tunnel Drierr’s Electrocardiogram And Skin Electrical Signal Under The Coupling Effect Of Illumination And Longitudinal Slope

With the sustained and rapid development of the national economy,people’s demand for cross sea and cross river traffic is increasing.As an effective facility of cross sea traffic,the undersea tunnel brings huge traffic convenience and economic benefits.However,due to the huge differences between the internal and external environment of the tunnel and the unique "V" shape structure of the undersea tunnel,it also brings some hidden dangers to the traffic and operation safety.Once a traffic accident occurs in the undersea tunnel,it is difficult to evacuate,rescue and heavy losses.In order to reduce the occurrence of traffic accidents in the tunnel,it is of great significance and social value to further study the influence of the coupling effect of illumination and longitudinal slope on the driver’s electrocardiogram,skin electricity and driving behavior.In this paper,the research status of the physiological characteristics and visual characteristics of the drivers in the tunnel was summarized,the Qingdao Jiaozhou Bay Undersea Tunnel was selected as the experimental tunnel.After collecting and screening,The electrocardiogram,skin electricity and vehicle speed data of 22 drivers passing through the approach section,entrance section,downhill section,middle section,uphill section,exit section and departure section of Jiaozhou Bay Undersea Tunnel in the morning and afternoon off-peak hours were obtained,analyzed the relationship between the electrocardiogram,skin and behavior characteristics of drivers with illuminance and longitudinal slope in different sections of the undersea tunnel.Through SPSS singlefactor analysis of variance,the differences in electrocardiogram,electrical skin and behavior characteristics of drivers in different driving sections were analyzed in detail,and least significant difference(LSD)was used to specifically compare whether the difference in the impact of different slope ranges on the electrocardiogram,skin and behavior characteristics of drivers.The relationship model between the illuminance and slope of the undersea tunnel and the physiological and behavioral characteristics of the driver is constructed through Origin software,and the change law of the driver’s electrocardiogram,skin electricity and vehicle speed in each section of the undersea tunnel was quantitatively analyzed.The results show that when the driver is driving in each section of the undersea tunnel,the rate of illumination change has an effect on the driver’s heart rate,the standard deviation of the sinus heartbeat R-R interval(SDNN)and the skin conductance level(SCL),but has no significant effect on the vehicle speed,the illuminance change rate has an obvious positive correlation with the driver’s heart rate growth rate and SCL value,and an obvious negative correlation with the SDNN value.There are significant differences in the influence of different ranges of uphill and downhill gradients on the driver’s heart rate growth rate,SDNN value and SCL value,when driving on up and down slopes,as the slope increases,the driver’s heart rate growth rate increases,the SDNN value decreases,and the SCL value increases,but there are differences in the law of change.When driving on the up and down slopes of the undersea tunnel,the minimum value of the driver’s SDNN value,the heart rate growth rate,and the maximum value of the SCL value all appear in the range of 3.5%-4%.Compared with the uphill section,the heart rate growth rate,SDNN and SCL of the drivers in the downhill section of the undersea tunnel are higher,which indicates that the psychological load of the drivers in the downhill section of the undersea tunnel is higher than that in the uphill section.There are significant differences in the impact of different ranges of up and down slopes on the speed of the driver.Using Origin software,the data fitting method was used to construct the relationship model between the illuminance,slope and heart rate growth rate,SDNN value of the undersea tunnel,the relationship between the illuminance,slope and the driver’s heart rate growth rate and SDNN value was quantified.Constructed a model of the relationship between the illuminance,slope and SCL value,and quantified the relationship between the illuminance,slope and the driver’s SCL value.Constructed a model of the relationship between the slope and the speed of the vehicle,quantified the relationship between the slope and the speed of the driver.Based on the changes of physiological and behavioral indicators of drivers under different illuminations and slopes,some suggestions on safety management of undersea tunnel section are put forward,which provides a theoretical basis for the safety management of undersea tunnel.