Prediction And Control Research Of The Surrounding Soil Deformation By Shield Tunnel Driving

The construction of shield tunneling method will disturb or destroy the soil-body with different degrees, and result in ground movement, deformation, and even induce a series of questions about environment damage or disaster accident, such as surface subsidence, foundation collapse, tunnel gushing, damage of surrounding buildings and underground pipeline, no matter what is the depth of the tunnel buried. With the wide application of shield tunneling method in city subway constructions, people pay more and more attention to the effects of the construction of shield tunneling method on surrounding environment, especially to the uplift and subsidence of the ground. Consequently it appears especially important that forecast the influence degree of the tunnel surrounding soil by the shielding construction parameters as accurate as possible, so that we can take measures to reduce deformation in design or construction.According to the analysis of each monitored data in the process of shield driving, and apply finite element software Plaxis 3D Tunnel to simulate the influence on the balance pressure of the working face, synchronized grouting amount, the depth of the tunnel buried, and the soil condition to the deformation of surrounding soil, I got the following research results:(1) The reason for the deformation of surrounding soil by shield tunnel driving, the deformation mechanism, the deformation characteristics and the deformation factor are theoretically analyzed ;(2) According to the analysis of each monitored data at worksite and apply finite element software on numerical simulation experiment, systematically study the influence on the deformation of surrounding soil by the shielding construction parameters, and obtain the effect regularity of the deformation of surrounding soil by the variational shielding construction parameters;(3) According to the measured analysis of the shielding parameters under the different construction conditions and numerical simulation analysis, obtain the setting regularity of the shielding construction parameters in the process of shield driving;(4) According to the characteristics of the effect to the soil deformation by each construction parameters, summarize the general rule of the soil deformation due to the variational shielding construction parameters;(5) According to the characteristics of the effect to the soil deformation by each construction parameters, advance some concrete measures for controlling the soil deformation in the process of shield driving.