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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1~3m范围内,最大累计沉降量出现在隧道拱顶,其量值达35.9mm,最小累计沉降量出现在相对稳定的拱底,其量值为1.7mm。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 of Liangjiashan Highway Tunnel, the three-dimensional space model of mudstone tunnel was established by finite element analysis software. The stress distribution of surrounding rock of tunnel under different construction procedures, the settlement deformation of the characteristic points and its horizontal convergence rule were analyzed and analyzed. The influence of core earthwork reserved by tunnel annular excavation on surrounding rock stress distribution, settlement deformation and horizontal convergence of mudstone tunnel was studied. The calculation results show that the location where the stress of the surrounding rock changes significantly mainly occurs in the range of 1 ~ 3m near the excavation face of the tunnel and the maximum cumulative settlement appears in the tunnel vault with a value of 35.9mm and the minimum cumulative settlement Appear in the relatively stable arch, the amount of 1.7mm. With the construction of the tunnel, the horizontal convergence curve tends to decrease as a whole, and the stress and deformation of the surrounding rock of the tunnel are basically stable.