Risk Assessment Of Subway Station Structure Operation In Karst Geological

China is a country with more developed karst especially the Yunnan and Guizhou and Guangdong and other places is particularly common.Therefore,the research on the safety factors of subway engineering in karst area and the reasonable evaluation of the safety indexes of subway stations have become an important subject in the urban subway construction project.The subway engineering design life is 100 years or more.The geological condition of investigation is only the state of that time.In operation period,the karst formation situation may change.The surrounding karst development of the subway station and the surrounding environment changes will affect the safety of the operating period.During the construction of subway station,such as karst risk factors may result in foundation pit collapse,surrounding surface and building(structure)building collapse and impact station construction in the main structure of the security,but also the construction period risk assessment system of subway station are static of the risk assessment,so the risk assessment takes subjective a large proportion of the factors in the process of.In the subway station operation period,karst and other factors may cause uneven settlement of the structure of the station structure,crack and surface displacement and other consequences,and these risk factors are in a dynamic operation period.This paper mainly studies the Guangzhou Metro Line 9 karst geological conditions,changes in the surrounding environment of subway station operation safety as the engineering background,the dynamic analysis of the station operation period,more scientific risk assessment.Through the in-depth investigation of the project site,combined with the characteristics of the project,the risk factors of scientific determination.By using the method of numerical simulation,to explore the various risk factors on both the safety of subway station structure,and establish the relationship between risk factors and safety indicators,and then through the fuzzy mathematics principle,to achieve security for quantitative evaluation of karst area of the existing subway station.The main contents are as follows: through numerical data acquisition and computer simulation,the risk factors in the establishment of the karst and the surrounding environment of the station safety set,safety index set and evaluation set;using fuzzy mathematics principle,the fuzzy regression evaluation model;implementation of karst area of existing subway station safety assessment;safety assessment of Guangzhou metro line nine station Huadu Auto City,combined with the actual case to verify the accuracy of evaluation system,to provide support for the project related theory.