Research on Surface Deformation of Twin Shield Tunneling by Random Finite Difference Method
Research purposes:Accurate prediction of surface problems caused by twin shield tunneling excavation is very important to ensure the safety of the surrounding area.We have organically coupled non-invasive stochastic analysis,the finite difference method,and the response surface method within the framework of random field theory to establish a finite difference model for analyzing surface deformation in non-invasive shield double-track tunnels.We systematically study the influence of soil parameters and the spacing of twin shield tunneling on surface deformation.Research conclusions:(1)The variation coefficient of soil parameters and the distance between double tunnels have obvious influence on the change of surface deformation characteristic curve.(2)The characteristics of surface deformation curve are closely related to the random distribution of soil parameters.Due to the dominant effect of low stiffness,the modulus shows a lognormal distribution.(3)Compared with the Monte Carlo method,the calculation accuracy is similar,and the accuracy increases with the increase of the order,and the calculation efficiency advantage is prominent.(4)The research results can provide a quick,reliable and simple method for the selection of design parameters,and can also provide reference for similar projects.
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