Research For The Methods Of Disease Monitoring And Safety Assessment In Chongqing Nancheng Tunnel

With the rapid development of China’s traffic construction, the number of tunnelswhich are used already is increasing year by year, the disease problems of these tunnelshave become increasingly prominent. The development of tunnel maintenancetechnology is late in China, no standards and norms for Monitoring and assessmentmethods of the tunnel used are put forward as a guide.on the basis of summarying theprevious people’s experience of tunnel monitoring measurement techniques andtheoretical studies,this dissertation Relys on Chongqing Nancheng Tunnel diseasemonitoring and safety assessment project, carrys out a detailed study to the methods oflong-term monitoring of the operational road tunnel disease, monitoring content,monitoring methods and data processing, and puts forward a set of operations tunnelsafety assessment,achieves a method of quantitative safety evaluation to the tunnelsused,main conclusions are as follows:1.Taking the new tunnel monitoring measurement method as a reference,andbinding the test report and the disease characteristic of the based project, design along-term monitoring for the based project. To enable the monitoring can react thespecific state of the tunnel, five monitoring contents which include the lining crackmonitoring, clearance change monitoring, the lining stress monitoring, surfacesubsidence monitoring and outside the cave inspections are identified,and take a studyfor the corresponding monitoring methods, comparing with different monitoringmethods, Identified the methodsfor this based project.2.Relying on the monitoring of the project, Processing the collected data,and useregression analysis methods to curve fit the monitoring data, then,observe themonitoring data trends, achieve the prediction of the future status of the diseasesymptoms’ development.3.On the basis of domestic and foreign experiences on the tunnel inspection andmaintenance methods, taking a research for the operational road tunnel’s safety levelcriteria, determine the qualitative and quantitative determination of the reference of thesafety evaluation index. The safety fuzzy comprehensive evaluation model foroperational road tunnel is established based on the principle of fuzzymathematics,achieving the safety evaluation for the based project by the long-termmonitoring, forecasting the tunnel’s future security through regression analysis of the monitoring data.4.This dissertation is based on the Chongqing Nancheng Tunnel project, andstudys the monitoring design, monitoring methods, data acquisition and processing,evaluation methods of the road tunnels being used, provides the basis for themaintenance and repair design of South City Tunnel,and provides a reference for othersimilar projects at the same time.