| Maintenance area is an important part of expressway operation management.When the maintenance work of the tunnel section is carried out,the special driving environment and the setting of the maintenance work area have double influence on the traffic flow,and the safety problems are outstanding,it is necessary to carry out relevant research.On the basis of analyzing the characteristics of vehicle driving and the driver’s eye movement characteristics in the maintenance area of the highway tunnel section of the mountainous expressway,in order to improve the safety of vehicles running in the maintenance area of expressway tunnels in mountainous areas,safety studies were carried out in three aspects:Vehicle confluence,vehicle lane change and car following,and risk control measures are put forward for dangerous sections of maintenance work.First,on the basis of relevant research at home and abroad,the research status of highway maintenance work area at home and abroad is combed,and on the basis of different sections of general maintenance area,the particularity of the setting of the working area in the maintenance area of the tunnel section is expounded.Then,according to the maintenance area layout and traffic management status of highway tunnel section in China,the traffic organization mode of tunnel section maintenance area is arranged,including double hole single row maintenance operation area and single hole double row maintenance operation area,and the influence of tunnel section maintenance area setting on traffic safety is analyzed.Through the field investigation of the maintenance area layout pattern of the expressway tunnel section and the characteristics of the influence on the traffic operation in China at present,this paper analyzes the safety research requirement of the maintenance operation area of the tunnel section from three aspects of environment,vehicles and drivers,and designs and carries out the test of the maintenance operation area of the high speed highway tunnel section in the mountain area,and obtains the layout of maintenance operation area,traffic operation and driver’s eye movement data.The distribution of vehicle speed,head time distance and vehicle track,as well as the characteristics of driver’s fixation point distribution,fixation duration,pupil diameter,scan amplitude,and duration of saccade are analyzed.The results show that there are certain differences between the vehicle driving characteristics and the driver’s eye movement characteristics in the double row and single tunnel maintenance operation areas,the upstream transition,the buffer zone and the working area in the two maintenance areas are more risky,and the traffic environment of the single hole and double row maintenance operation area is more complex,and the safety facilities are more attractive to drivers.Finally,based on the characteristics of the vehicle driving characteristics and the driver’s eye movement in the maintenance area of the highway tunnel section of the mountainous expressway,the traffic safety characteristics of the maintenance work area are carried out from the vehicle confluence behavior,the vehicle changing process and the car following.The results are as follows:Based on the acceptable gap of vehicle confluence,the Logistic regression model is established,and the model is used to determine the safety of vehicle confluence.The lane keeping model is established by using the path of vehicle switching and the driver’s fixation angle and fixation time,and the deviation rate of vehicle trajectory is proposed,and lane keeping capability is analyzed by combining lane keeping model and vehicle trajectory offset rate.Select the TTC value of 0～30s and corresponding relative deceleration value when the car is following the car,establish the relationship between TTC and deceleration,and use the model to judge the level of traffic conflict of the car following car.According to the study on the traffic safety characteristics of the maintenance section of the tunnel section,the upstream transition zone,buffer zone,and work zone are high-risk sections.In view of the high-risk sections of the maintenance work area,risk control techniques were studied from the risk section length setting and the vehicle driving state control.Through the study of the length of the confluence area and the opening length of the central separation zone,and the measures of the speed control of the vehicle and the control of the track of the vehicle,the risk of driving in the maintenance area of the highway tunnel section of the mountainous expressway is improved.Through the research on the safety characteristics of the maintenance zone in highway tunnel section of mountainous area,the characteristics of vehicle driving and the eye movement characteristics of the driver in the maintenance section of the tunnel section were obtained.The method of distinguishing the safety of vehicle operation and the risk control technology of driving were established.The theoretical basis for the layout,traffic organization and management of the highway maintenance tunnel operation section is provided. |
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