Research On Carrying Capacity Improvement Of High-speed Railway Based On Optimization Of Train Stopping Structure

As China’s high-speed railways are gradually integrated into the network,the transportation capacity of some busy high-speed railways has become more tense,and the contradiction with passenger demand has become increasingly prominent.It is urgent to study transportation organization methods and measures to alleviate the high-speed railways’ tight capacity.This paper starts with the optimization of the stop structure in the traffic organization,and proposes a practical method for improving capacity through analysis,and analyzes the relationship between the stop structure and the effect of capacity improvement.The main work of this article is as follows:1.This paper sorted out the basic theoretical knowledge of the stop plan and the stop structure,clarified the method of expressing the stop structure,and compared and analyzed the domestic and foreign high-speed railway stop modes.Then combed the relationship between the stop plan and the train diagram and the traffic organization plan in the actual compilation process,and then obtained the influencing factors of the stop structure and converted it into a quantifiable index.2.The definition of section passing ability under the research system of this paper is clarified.This paper analyzes the advantages and disadvantages of the existing high-speed railway capacity calculation methods,uses the train diagram occupation time as a measure of capacity improvement,and analyzes the relationship between the two.And then introduces the calculation formula of the train diagram occupation time,and eliminates the impact of the buffer time through CPLEX programming,so as to obtain a method for calculating the actual train diagram occupation time.Then,the concept of "stop structural unit" is introduced,and the relationship between the stop structure and the extra time in the station is analyzed,and a simple stop plan preparation proposal is given.3.This paper studies the compression model of the train diagram occupation time based on the train stop structure when certain stop requirements are set.The main idea is: firstly,convert the existing operation chart into a "compact paving" operation chart,and inherit its stop requirements,start with the optimization of the stop structure,and divide it into two scenarios: no crossing and having crossing.Secondly,the objective function is the least occupied time of the train diagram,and the independent variables is overtaking or not and stop or not,taking the maximum stop rate of trains,node service frequency,and station service balance as stop requirements.Finally,a 0-1 linear programming model was established.And then this paper describes the stop structure and the effect of capacity improvement through two eigenvalues.The main idea is: based on the extra occupied station time of the stop structural unit,the concept of "outreach" is proposed,and the difference between the "outreach" before and after optimization is used as an index to measure the effect of capacity improvement.And then based on the extra time occupied by each unit of the stop structure unit,an index describing the stop structure—the eigenvalue of the stop structure is proposed,and a method for calculating the eigenvalue using MATLAB software is given.4.In this paper,the Tengzhou-Dingyuan district of the Beijing-Shanghai high-speed railway is used as the base map.After determining the relevant technical parameters,10 sheets are generated that meet the "compact paving",have the same stop requirements and have different stop structures,And then apply the capacity improvement method to these studies.And this paper select CPLEX software to solve the no-overtaking model.The solution results show that this method effectively reduces the train diagram occupation time of the example,and improves the through capacity,which proves the feasibility and superiority of this method,while ensuring the passenger flow demand.Then through analyzing the optimized train diagram,the two-point stop plan setting proposal is put forward.5.This paper calculates the train diagram occupation time,outreach degree,capacity improvement effect,and stop structure eigenvalue of each scheme.Through analysis and MATLAB software simulation,the relationship between the four is clarified.This makes it possible to know the approximate improvement effect of the method on a certain train diagram according to the stop structure eigenvalue of the train diagram before applying the method.