期刊论文

Chen, Y.(cheny1963@163.com)

中文

中南大学学报(自然科学版)

1672-7207

2012

43

3

1138-1143

国家自然科学基金资助项目（40802064）； 湖南省交通运输厅2009年度科技进步与创新计划项目（200925）；

本校为第一且通讯机构

根据某高速公路连拱隧道衬砌结构形式，建立有限元计算模型，通过改变回填混凝土单元的弹性模量模拟回填混凝土的不同密实程度，采用数值模拟方法研究回填混凝土弹性模量变化对连拱隧道稳定性的影响。研究结果表明:围岩的变形和应力以及衬砌内力均随着中墙顶部回填混凝土弹性模量的增大而大幅度降低；当回填混凝土弹性模量比由0(完全脱离)增加到100%(完全密实)时，拱顶沉降和围岩拉应力分别降至75%和20%左右，内衬弯矩可降至17%左右；当弹性模量比达到60%以上时，内衬弯矩基本保持不变；中墙应力随着回填混凝土弹性模量的增大而增大，且弹性模量比越低，中墙应力变化幅度越显著，回填混凝土完全...

A FEM analysis based on a model of an expressway multi-arch tunnel was carried out to study the influence of different elastic modulus of back-fill concrete. The results show that the deformation and tension stress of surrounding rock decrease greatly with the increase of elastic modulus. When the elastic modulus ratio of the back-fill concrete increases from 0 (completely separated) to 100% (completely dense), the settlement and the tensile stress of the surrounding rock at the arch crown decrease to about 75% and 20% respectively, and the bending moment of the inner lining decreases to about...