泥岩隧道施工技术对围岩的影响及其数值模拟分析  

Influence and Numerical Simulation Analysis of Mudstone Tunnel Construction Technology of the Surrounding Rock

作　　者：冯忠居[1] 朱登远[1] 彭小兵 丁志峰 熊山铭[1] 贾彦武[1] 

机构地区：[1]长安大学公路学院,西安市710064 [2]中铁四局集团第七工程分公司,合肥市230022

出　　处：《公路》2013年第12期224-229,共6页Highway

摘　　要：结合梁家山公路隧道工程实际,利用有限元分析软件,建立了泥岩隧道的三维空间模型,计算分析了不同施工工序下隧道围岩应力分布、特征点的沉降变形量及其水平收敛规律,研究分析了隧道环形开挖预留核心土法对泥岩隧道的围岩应力分布、沉降变形及其水平收敛规律的影响.计算成果表明,围岩应力发生显著变化的位置主要出现在隧道开挖面附近距洞壁1～3 m范围内,最大累计沉降量出现在隧道拱顶,其量值达35.9 mm,最小累计沉降量出现在相对稳定的拱底,其量值为1.7 mm.随着隧道施工的进行,水平收敛曲线整体上呈减小趋势,隧道围岩应力变化及其沉降变形基本稳定.Combined with the actual engineering characteristics of the Liangjiashan tunnel, using finite element analysis software, a three-dimensional space model of the mud-stone tunnel is established in the paper, the stress distribution of surrounding rock is calculated, the settlement deformation of each feature point and horizontal convergence law in different construction process are analyzed, and the construction technology of ring excavation leave core soil method and its construction process＇s influence on the stress distribution of surrounding rock, the settlement deformation and the horizontal convergence law are studied. Calculation results show that the position of surrounding rock where stress greatly changed mainly appears in the excavation face of the cave walls, ranging from 1 m to 3 m~ the maximum accumulative settlement appears in the tunnel crown, the value is 35.9 mm~ and the minimum total settlement appears in the relatively stable arch feet, the value is 1.7 mm. With the construction progress of the tunnel, the horizontal convergence curve shows a trend of decrease on the whole, stress changes and settlement deformation of the surrounding rock remain stable in general.

关 键 词：隧道工程 泥岩 数值模拟 围岩应力及变形 环形开挖 预留核心土 施工技术 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]