基于ADINA的隧道开挖变形分析

采用大型非线性有限元分析软件AD INA对隧道开挖变形进行数值模拟,建立二维有限元分析模型;采用AD INA自带的单元生死功能动态模拟开挖支护过程,对比全断面开挖法与上下台阶法开挖两种施工方法,分析两种方法对隧道围岩变形的影响,结论是两种方法产生的变形均向洞内收缩,拱顶Z向位移变化较为接近,两邦Y向位移是全断面法大于上下台阶法;此外,对锚杆的位移变化进行了分析,进一步说明两种施工方法对洞周围岩变形的影响,此时锚杆均受拉,起悬吊作用。

Analysis of Deformation of Tunnel Exeavation Based on ADINA

There is made the numerical simulation of deformation of tunnel excavation with large-scale nonlinear finite element analysis software ADINA.2D finite element analysis model is established.Excavation shoring course of ADINA's built-in unit life and death function mobility-type analogy is adopted.Excavation construction methods of two kinds-full-section excavation and upper-lower level excavation are contrasted each to other.The paper analyzes the influence of both kinds of methods on deformation of tunnel's surrounding rock.Come to the conclusion that the deformations produced by both kinds of excavation methods are contracted all to bore inside,the vault z displacements are closer,two Y displacements are that full-section excavation method is bigger than upper-lower level excavation method.In addition it analyzes yet the change of bar in displacement,further illustrates the influence of both kinds of excavation methods on deformation of surrounding rock of tunnel.In above-mentioned circumstances the bar just receives pulls and plays a suspension role.