Study On Suitability Evaluation Of Subway Station Location Based On Projection Pursuit Model

With the rapid development of China’s society economy,the transportation demand of residents is growing with each passing day,many cities are undergoing massive subway construction.The subway station is an important component of the subway transportation system,however,the scientificity and effectiveness of some subway stations siting in engineering practice is insufficient,construction safety accidents and operation development falls short of expectations are frequent occurrence.How to evaluate the scientificity and effectiveness of the site selection scheme is of great significance to the safe construction and smooth operation of the subway station.Therefore,this master’s dissertation completed the following research content.(1)Based on accurately defining the core concepts of the subway station project and project life cycle,this thesis summarizes the characteristics of subway station project and site selection demands.The suitability evaluation of subway station site selection is defined as a quantitative judgment of the suitability of subway station site selection schemes through comprehensive analysis of relevant influencing factors.In addition,this thesis briefly introduces the calculation principle of projection pursuit model(PPM)and particle swarm optimization algorithm(PSO),their applicability or necessity in this study are analyzed.(2)The suitability evaluation model of subway station siting was constructed based on PPM.On the premise of comprehensive analysis of the project site selection demands,the initial general index system of the subway station site selection suitability was constructed by using the literature research method.Then,the PPM is used to analyze and excavate the characteristics of evaluation data structure to build a quantitative evaluation model,which not only does not need the joint use weight calculation method,but also solved the difficulties of high dimensional and nonlinear in the evaluation of the suitability of subway station siting.The optimal projection vector in PPM is solved scientifically and efficiently by using PSO with powerful global search ability and modeling adaptability.Linear interpolation function is used to analyze the function mapping relationship between siting suitability grade and evaluation data structure features.(3)In the empirical analysis phase,fifteen subway stations of Chengdu Metro Line 11 were selected for this study.The research showed that the index system of the empirical research object includes 2 first-level indicators,8 second-level indicators and 21 third-level indicators.The operation stage was the core of site selection,regional population density,coordination of development planning,and engineering geological conditions of rock and soil are the most important three-level indexes.Tianfu CBD East Station has the best site suitability,while Huilong Road West Station has the worst site suitability of the empirical research objects.The results of site selection suitability evaluation in this paper are basically consistent with the performance of station construction stage and surrounding development in operation stage,which proved he scientificity and effectiveness of the model.By comparing with the classical method,it proves the advanced nature of the research method in this thesis.According to the results of empirical analysis,this master’s dissertation proposed measures to improve site selection ability of administrator.