| With large-scale construction of urban rail transit, the city subway line has developed from a single line into the complex network, inevitably there are a lot of problems were more and more the transfer between lines and cross. Therefore, how to effectively carry out shield under wear engineering protection existing subway tunnel structure safety and guarantee the normal operation of metro research has positive significance. This article in guangzhou metro line 7 new Zhong Han interval in both line 3 under the shield project as the background, the theoretical calculation and analysis, field monitoring control, engineering methods of numerical simulation of shield in a subway tunnel under control both the research deeply on the settlement of tunnel structure, summarizes existing tunnel settlement rule, analysis, and the impact on the existing tunnel subsidence grouting technique and reasonable construction Suggestions are put forward. Concrete research content is as follows:(1) shield in a subway tunnel under construction in both the tunnel subsidence theory:Briefly in the surrounding soil of shield construction settlement mechanism and the main factors influencing the sedimentation, an introduction of shield in existing subway tunnel under construction, the newly built tunnel and existing tunnel interaction mechanism, and wear both under the shield tunnel construction in the grouting control effect on both the tunnel subsidence theory analysis.(2) under the shield in existing metro line engineering case analysis:Wear under a line under construction in guangzhou metro line case analysis, the introduction of shield to wear under the existing subway tunnel engineering construction plan organization and the specific construction measures, based on the monitoring data, to explore and summarize the shield to wear under the existing subway tunnel during the construction of the existing tunnel structure in different construction stages of the settlement of change rule.(3) set up under the shield in both the tunnel engineering model for numerical simulation research:Combined with practical engineering cases, model type, material parameters and the shield tunneling construction process simulation, finite element software MIDAS GTS set up under the shield- in both the model of shield tunnel excavation. To the actual project monitoring data and numerical simulation data analysis comparison, validate the rationality of the method, and summarizes the shield in existing subway tunnel under construction in both the deformation law of tunnel structure.(4) under the shield in the construction of the construction parameters influence on existing tunnel deformation analysis and the optimization Suggestions:Combined with numerical simulation methods to analyze wear under the shield construction of different construction parameters control both the tunnel subsidence, and puts forward the related construction parameters optimization Suggestions. |
PDF Full Text Request