盾构掘进施工对地表沉降规律的影响

Influence of shield tunneling pressure on surface settlement patterns

城市地铁盾构施工将会对下穿地层的岩土体产生扰动,不可避免地诱发地表沉降变形。文章以深圳市某线路区间地铁盾构施工为研究背景,通过ABAQUS数值分析软件建立三维数值分析模型,研究不同的盾构顶进压力和注浆压力对隧道地表沉降的变形规律。研究结果表明:在掘进压力不变的条件下,盾构施工在纵向的沉降值随着距离的增加逐渐减小,并趋于稳定;掘进压力和注浆压力的增加对于隧道沉降值控制效果较为显著;过大的掘进压力和注浆压力将会导致地表发生隆起变形。研究结论可为类似工程提供参考。

The construction of urban subway shield tunnels can disturb the underlying geological formations,inevitably inducing surface settlement and deformation.This paper takes a section of a subway tunnel construction project in Shenzhen as its research context.By employing the ABAQUS numerical analysis software,a three-dimensional numerical analysis model is established to investigate the deformation patterns of tunnel-induced surface settlement under varying shield tunneling face pressures and grouting pressures.The research findings reveal the following:Under constant tunneling face pressure,the longitudinal settlement values decrease gradually with increasing distance and tend to stabilize;Increasing tunneling face pressure and grouting pressure have a significant effect on controlling tunnel-induced surface settlement;Excessive tunneling face pressure and grouting pressure can cause surface uplift deformation.The conclusions drawn from this study can serve as a reference for similar engineering projects.