Optimization And Benefit Evaluation Of Highway Maintenance Total Cost Model

The mileage of highway maintenance in China has been great improved,but there is still problems in the economic benefits and the scheduling and management of highway maintenance and construction.This dissertation focuses on the maintenance projects on multiple-lane highways.Highway maintenance activities usually require lane closures and disrupt traffic operations.Because of budget constraints,project deadlines,and the resulting traffic impact,the objective of this dissertation is to minimize the total project cost by optimizing work zone schedules.It is aims to provide theoretical foundation and technical support for schedule on safety management work.This dissertation carries on the example analysis through the measured data.First of all,taking the maintenance construction content as a starting point,according to the conservation time and the nature of maintenance,the highway maintenance was classified,and the basic content of highway maintenance was summarized.By combing the impact of the number of enclosed lanes,lane width and lateral clearance,the proportion of large vehicles,the speed limit of the operating area,the length of the working zone,and the closed form of the lane to the capacity,the calculation method to determine the capacity of the work zone in this dissertation is based on the analysis of the above-mentioned influencing factors and HCM(2010).According to the relevant requirements of the “Safety Work Rules for Highway Maintenance”(JTG H30-2015),the work zone was divided into 7 segments: advance warning zone,upstream transition area,longitudinal buffer area,transverse buffer area,activity area,downstream transition area,and termination area,and the length of each segment was divided scientifically and reasonably.Then,a total cost model for highway maintenance was established and cost-effectiveness evaluation indicators were determined.Based on the time-varying traffic volume,the travel time of maintenance road and alternate road is equal to the diversion condition.Time-varying traffic diversion is performed for the vehicles on maintenance road and alternate roads,and the traffic distribution of maintenance road and alternate roads is updated in real time.In order to reduce vehicle delays on highway maintenance.This dissertation divides the total cost of road maintenance into agency cost and road user cost.The agency cost includes maintenance cost and maintenance idling cost;road user cost includes travel delay cost,additional vehicle operating cost and traffic accidents cost.The travel delay cost includes: deceleration delay,queuing delay,speed limit delay,acceleration delay and alternate route moving delay.Minimizing the total cost of maintenance is as an objective function in this dissertation,and the project length,maximum duration of project,and minimum duration of work activity as constraints to optimize the scheduling.The scheduling of project reduces maintenance cost and maintenance idling cost.The maintenance cost will be reduced,but the continuous construction work will result in a decrease in the capacity of the work zone,and an increase in the delay of the road users will increase the cost of the road users.Therefore,the best scheduling will balance agency cost and road user cost.This dissertation estimates the benefits of road maintenance from the perspective of road users from three aspects: travel time cost saving,travel cost saving and vehicle safety cost saving.The economic benefit-cost ratio is selected as a cost-effectiveness determination index to judge the economic feasibility of the technical solution.Finally,based on the actual measurement data,an example analysis is performed.By using the relevant parameters of a given model,the genetic algorithm is used to calculate the total cost of time-varying traffic distribution and highway maintenance,and the schedule for the minimum total maintenance cost is obtained,and the capacity for alternate routine is obtained.Sensitivity analysis was conducted to determine the effect of alternate routine capacity on the total cost of maintenance,and the economic feasibility of the technical solution was demonstrated through cost-benefit indicators.