Deformation Mechanism And Control Measures Of Shield Tunneling Through The Main Canal Of The South-to-North Water Transfer Project

In recent years,the construction of urban underground rail transit has not only greatly alleviated the congestion problem in the city and promoted the process of urbanization,but also promoted the rapid development of the local economy.However,while the construction of subway tunnels brings convenience,it often disturbs the surrounding stratum.In severe cases,it can cause accidents such as surface collapse,pipeline rupture,and collapse of buildings(structures)above the tunnel,which affects the surrounding environment and affects peoples daily lives.Safety of life and production.Therefore,when there are structures(structures)above the tunnel during shield tunneling,how to ensure the safety of the existing structures(structures)above the shield and reduce the impact of subway construction on the surrounding environment becomes the key to subway tunnel construction.Relying on Zhengzhou metro tunnel to Underpass south to North Water Diversion Project.Using on-site measured data statistical analysis,numerical simulation and grey relational analysis and other methods.The ground deformation caused by shield construction and the factors affecting ground disturbance are studied.Propose effective measures to manage the settlement.(1)The disturbance to the soil during shield tunneling is the main factor causing the deformation of the main canal.Reasonable use of shield tunneling parameters and construction measures can reduce soil disturbance.The above measures are to ensure the safety of the main canal structure of the South-to-North Water Transfer Project.(2)By collecting and sorting out the tunnel engineering surrounding geology and construction.Use MADIS GTS finite element software for numerical simulation analysis,and compare with actual monitoring data,the two are basically the same.It shows the feasibility of the numerical simulation analysis method adopted.On this basis,the coupling effect between the surrounding stratum,the subway shield tunnel and the main canal structure of the South-to-North Water Transfer Project is analyzed.(3)Through the study of shield tunneling parameters,it is concluded that increasing the tunnel depth,spacing,grouting pressure,soil bin pressure,reducing the diameter of the tunnel excavation surface and the shield tunneling speed can effectively reduce the stress loss in the formation.(4)Using Information Entropy to Improve Grey Relational Analysis.Sensitivity analysis of parameters affecting main canal deformation.Calculate the correlation degree of the parameters to the main canal structure.The distance between two tunnels has the greatest influence on the deformation of the main canal.(5)Combining numerical simulation results and field environment.To ensure that the surface and main canal structure deformation caused by shield tunnel construction meet the control requirements,and put forward targeted measures.It provide guidance for the implementation of similar projects in the future.