| Highway is a kind of road alignment design by the combination of plane curve and vertical curve,is the premise and foundation of car speeding.The reasonableness of the vertical combination is directly related to the speed and smoothness of the car.The systematic analysis and research on the linear index of the expressway can provide more and better reference for highway construction.It has great practical significance and technical guidance.In this paper,the friction coefficient under different conditions is tested,which combine the lateral skid mode of horizontal and vertical sections.After computational analysis the minimum radius of the horizontal curve of the vehicle is obtained.Then suggestions for improvement are given.Based on the calculation of pavement drainage duration,this paper analyzes the drainage situation of pavement under the condition of setting drainage facilities,studies the drainage situation of horizontal and vertical combined sections,and gives corresponding technical suggestions.The simulation experiments are carried out by combining the weft and UCwinroad in different situations,which combine physiological reaction of driver in different bad combination of road,studied the visual characteristics of horizontal and longitudinal composite sections and then proposed the minimum index of horizontal vertical curve.Finally,this paper starts from the design principle and combination characteristics of the flat vertical curve combination summarize and analyze the application conditions which can not meet the linear indicators of “Flat bag Vertica”.Then the writer put forward of the corresponding technical index. |
