不同穿越角度盾构隧道施工对浅基础建筑物的影响研究

Study on the influence of shield tunnel construction with different crossing angles on shallow foundation buildings

当建筑物与隧道轴线之间成不同角度布置时,随着盾构隧道的开挖对建筑物的影响程度也各有不同。采用三维有限元分析软件对与盾构隧道不同距离及角度布置的建筑物变形性状开展精细化分析。分析结果表明:当建筑物与隧道轴线成不同角度时,建筑物的沉降分布仍取决于地面的沉降变化趋势,且隧道开挖将导致建筑物产生扭转变形;对于任意角度的建筑物,当其跨越下凹和上凸区域时,隧道开挖对建筑物的影响最为显著;当建筑物纵墙与隧道轴线垂直时,墙体挠曲变形和拉应变值达到最大,此时建筑物最为不利。

When the angle between the building and the tunnel axis is different,the influence of shield tunnel excavation on the building is different.Three-dimensional finite element analysis software is used to analyze the deformation characteristics of buildings with different distances and angles from shield tunnels.The results show that when the building and tunnel axis are at different angles,the settlement distribution of the building still depends on the variation trend of the settlement of the natural ground.For buildings not perpendicular to the axis of the tunnel,the construction of shield tunnel will cause torsional deformation of the building.No matter how the angle between the building and the tunnel changes,when the building crosses the concave and convex areas,the tunnel excavation has the most significant impact on the building,especially when the vertical wall of the building is perpendicular to the tunnel axis,the wall deflection and tensile strain value reach the maximum,and the building is the most disadvantageous.