Study On Risk Management Of Xiamen No.1Metro Construction

The subway construction has the features of long cycle, complex construction technology and engineering environment, and significant impact of accident. In different specific conditions, the metro construction has its own specialties. Although the risk management in subway construction has received more and more attention and some experience and achievements are harvested, there still have been some accidents which caused a great of loss,. Risk control is based on risk identification and evaluation. In review of current existing evaluation systems, most of them are concentrated only in one or two of these three segments-"risk accident","risk factors","failure state" in identification, which means it’s hard to form a global view of riskquantification in the assessment system.This article follows the route as ’classifying and filtering based on inherent risk—safety analysis with numerical simulation—comprehensive assessment of risk’. At first, classify risks of the whole line according to their intrinsic properties, such as structure characteristics, construction methods, engineering environment, then sum up the difficulties in construction and sort out a typical object for further study. Second, via numerical simulation software Plaxis, the deformation value of support structures and strata displacement regularity, which are affected by structural design and regarded as representations of excavation safety, can be estimated, the influence on risk caused by parts project’s inherent attributes can be reflected as well. Third, on the basis of Work Breakdown Structure (WBS) theory and recent accident statistics of some cities, a new risk identification index system is set up, in that "process failure status" is treated as a foothold and the combination of a vertical multilevel appraisal loop built on WBS and a lateral linkage of "risk factors-failure state-risk accident"forfailure mode and effects analysis (FMEA). Afterward, the risk overall rating of can be determined after the data offered from expert investigation are analyzed by frequency count and improved fuzzy analytical hierarchy process (IF-AHP) method, as well as the relationship between possible outcomes and source factors will be established.The advantage of this risk evaluation system can be presented by the application to Xiamen Metro Project; Gaodian station project is selected as a typical site for research. Aimed at its own security risk, environmental safety risk and ecological risk, Gaodian station is evaluated as mid-level of construction risk and the distortion satisfies safety requirement. On account of the risk assessment conclusion above, some specific control measures are given in point of controllability view, which is practically significant. In this paper, this risk assessment method not only has theoretical significance but also practical sense on a more intuitive, comprehensive, quantitative risk analysis of large-scale engineering project. This more operable method overcome the defects that exist in the previous studies, and help making logical connections between factors around "failure state"sequenceIn this paper, the analysis of the method, not only has, and through this article research proves that this method can be used for large engineering for more intuitive comprehensive and quantitative risk analysis, to overcome the defects that exist in the previous studies, before and after the failure of the state of the logical relationship is established, more operable.