Research On Surface Subsidence Warning And Forecast Of Metro Shield Construction

Underground engineering construction safety accident often precursor, earlywarning technology is based on engineering experience of some regular phenomenaanalysis, to determine the safety state of the region or the possible accident, happenedto take corresponding measures to prevent accidents. This paper expounds the presentsituation and forecast method of early warning information system of ground surfacesettlement caused by shield tunnel construction at present, analyzed the problems andshortcomings, a prediction method of information system based on the early warningmechanism of shield tunnel construction; surface subsidence was studied, the mainfactors of the construction of shield tunneling on the influence of surface subsidencethe analysis of settlement; on the surface of measured data using the Guangzhousubway construction in Metro Tunnel Engineering, summarizes the distribution oftransverse, longitudinal settlement; two correction parameters of introducing Pecktheory formula was modified, the different formation conditions correction coefficientvalue; based on the "tunneling parameters the formation parameters-surfacesettlement" database, engineering and technical personnel in the information systemquery to a similar formation conditions, similar excavation parameters of surfacesubsidence value; using polynomial least squares fitting and Lagrange interpolationmethod to fit the curve of longitudinal settlement near the surface during constructionof shield machine cutter; using linear regression method. Caused by shield constructionin Guangzhou area of transverse settlement trough width coefficient calculationformula, thereby Get disk near the surface at any position of settlement predictionformulas; design with basic data management, query prediction, monitoring datareporting, monitoring data analysis, early warning, shield data expert consultingsystem of safety management system, the practical engineering conveniently, quicklygrasp the field security situation, timely information feedback using modifiedtunneling parameters, reduce the risk of accidents.