Research on the Calculation Method for Deformation Pressure of TBM Tunnel in Squeezing Ground
Research purposes:At present,research on double shield TBM is mainly focused on equipment selection and construction technology under squeezing geological conditions both domestically and internationally.However,there is relatively little research on the design of pipe segment structures.In order to make up for the lack of research in this area,based on the temporal and spatial effects of TBM tunnel construction,the focus was on the calculation method of deformation pressure of double shield TBM tunnel segments in squeezing ground.Research conclusions:(1)By using a genetic creep model,the temporal effects of surrounding rock deformation were simulated and integrated into the longitudinal deformation curve of the tunnel,thus forming a method for calculating the longitudinal deformation curve of the tunnel that takes into account the temporal and spatial effects.In addition,the advanced deformation in the first stage was also considered and a formula for the characteristic curve of surrounding rock was constructed based on the equivalent excavation diameter.(2)Using the elastic theory of thick walled cylinders,a stiffness calculation formula for pipe segment gravel composite support was derived,and an expression for calculating the critical elastic modulus was established.(3)Based on the principle of convergence constraint analysis,the formulas for the combined support force and displacement were derived,further forming a calculation method for the deformation pressure of pipe segments.Finally,the accuracy of the deformation pressure calculation method was verified through practical engineering cases.(4)The research result can be applied to the design of TBM tunnel segment structure in squeezing ground.
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