Research On Optimization Of Road Design Parameters In Logistics Park

With the rapid development of China’s logistics industry,the planning and design of roads in logistics parks are also becoming more and more important.Due to the unique characteristics of logistics parks,road construction cannot be applied blindly to the construction of urban roads or roads,and existing ones The "Code for the Construction of Logistics Parks" is too general.There is no classification and discussion based on the road class and vehicle characteristics of the logistics park,and the design of road parameters is closely related to traffic accidents.In view of this,this article analyzes the characteristics of the logistics park,and analyzes and optimizes the design parameters of the cross-section and part of the horizontal and vertical sections of the road in the logistics park.The determination of traffic capacity is the basis for the design of the number of road cross-section lanes.Therefore,the paper first carried out a revision of the basic traffic capacity of the logistics park,and conducted a comparative analysis with the urban road capacity,and found that the internal roads of logistics parks were <external roads <city roads.It is necessary to modify the capacity of the logistics park before designing the road;this also demonstrates the impact of traffic composition and vehicle type on the capacity.By analyzing the influencing factors of road traffic capacity in logistics parks,the traffic capacity is calculated based on the revised basic traffic capacity;the final traffic volume is calculated by predicting the future peak hour traffic volume and the design traffic capacity.By investigating the actual parallel conditions of the vehicle and the distribution of wheel trajectories,the Polyakov model is improved.Finally,different lane width calculation models are obtained,and the calculated values and corresponding recommended values are given;the existing urban road width values are compared and analyzed through comparisons.And amend the suggested value and found the following:1 The width of lanes for small vehicles on urban roads is generally wide;2 Lanes on the inside of the roads in the logistics parks,lane widths with no separation zone3The lane widths of the logistics park roads have different values.Generally,the inner lanes are the outer lanes and the middle lanes.Based on the vehicle type of the logistics park and its own parameters,the coefficient of lateral force was corrected,and the minimum radius of the flat circular curve was calculated by combining different values of the ultra-high transverse slope.By comparing the values of the urban road rules,the ultimate minimum radius was adopted.The calculation value of the lateral force correction coefficient of 0.146 and the 4% of the ultra-high transverse slope is calculated;for the general minimum radius,the calculation value of 0.146 and the ultra-high transverse slope of 2% is used.Based on the models and parameters of the logistics park,based on the driving characteristics,the calculated values and recommended values of the road surface inner radius parameters at each level of road intersection are given.Using Trucksim’s simulated operation on large-scale trucks with different speeds on 4%,6% and 8% vertical slopes,comparing the value of urban road longitudinal slopes,the relationship between longitudinal slope and slope length of roads in logistics parks was analyzed,and combined with logistics parks The total weight and speed range of the vehicle are given and the corresponding vertical slope recommended values are given.Finally,using Vissim to simulate the cross-section design of the road in the park,combined with the relevant evaluation results,indicating that improving the lane width is indeed conducive to improving vehicle operating efficiency.