岩溶地区盾构隧道变形参数敏感性分析

Sensitivity Analysis of Shield Tunnel Deformation Parameters in Karst Area

针对岩溶地区盾构隧道工程,采用有限元软件Midas GTS NX建立了本构模型,选取了黏聚力、摩擦角、弹性模量和泊松比4种土体参数以及盾构隧道埋深进行敏感性分析。通过分析可知:黏聚力的改变对盾构隧道拱顶和拱底相对变形量影响最大,摩擦角的改变对盾构隧道拱腰相对变形量影响最大,相关结论为类似工程提供了参考。

By finite element simulation software of Midas GTS NX,a constitutive model was established for shield tunnel engineering in karst area.Four soil parameters,namely cohesion,friction angle,elastic modulus and pois-son's ratio and buried depth of shield tunnel were selected for sensitivity analysis.The analysis shows that the change of cohesion has the greatest influence on the relative deformation of shield tunnel arch and arch bottom.The change of friction angle has the greatest influence on the relative deformation of shield tunnel arch waist.Relevant conclusions provide a reference for similar projects.