Study On Urban Subway Shield Construction Risk Early-warning

Nearly ten years, Chinese GDP has been keeping development with rapid speed.Urbanization is growing faster. To meet the requirement of the development of citytraffic surging demand, Urban subway construction which has been thought forlarge-capacity, little energy consumption, light pollution, high security and less areacovered, gets priority to the development. Shield tunneling has been being maintechnique in the construction of subway for its special advantage. But because ofenvironment and the technology are complex, the city subway shield tunnelconstruction faces a large of risk factors, the construction accidents are common. Insubway construction, the warning and controlling for the uncertainty risk factors are stillrelatively weak. The major way is still limited to the single index warning throughgeotechnical and structure deformation monitoring, it’s lack of subway shield tunnelconstruction of all kinds of risk factors for overall risk analysis and risk early warningmanagement. The article in view of the city subway shield tunnel construction riskmanagement problems to research from the system of risk analysis and early warningmanagement aspects, to improvie the urban subway shield tunnel comprehensive riskanalysis and early warning management. It has certain theoretical and practical value.This paper in view of the city subway shield tunnel construction risk early warningmanagement system to do some research and exploration. First the paper studys onurban metro shield construction risk characteristics, and makes an identification citysubway shield tunnel construction risk factors in system, then achieves the city subwayshield tunnel construction risk factors set. Next,according to urban subway constructionrisk factors set, establishes the city subway shield tunnel construction risk early warningindex system. And establishes the city subway shield tunnel construction riskassessment motel based on the concept of risk. Through further researching MCsimulation technology solution model of the specific method, the paper constructes thesolving procedure and method.At last,the paper makes a study on how to set and dividethe warning index limits, warning threshold and warning level, establishes the urbansubway shield construction risk early warning system,and makes software to realize itsmain function.This paper makes a systematic research on the city subway shield tunnelconstruction risk early warning.It is an exploration for perfecting the current urban subway shield construction risk control theory.