深埋盾构隧道在岩层中穿越桥梁时隔离桩适用性研究

隔离桩由于能够隔断隧道施工引起的地层变形而减小隧道施工对桥梁的影响，所以在工程实践中得到了广泛应用，但是对于这种措施的适用性却鲜有研究。以南京地铁6号线下穿高铁桥梁为背景，研究深埋盾构隧道全断面穿越岩层时隔离桩的隔离效果和适用性。通过数值计算和实测数据的分析表明：在上述条件下隔离桩的隔离效果并不明显，而且隔离桩的应用反而对桥梁结构造成不利影响。

Research on Applicability of Isolating Piles When Deep buried Shield Tunnel Crossing Bridge

Because isolating piles can obstruct ground deformation resulting from construction of tunnel, they can mitigate the influence of tunnel construction on bridges and are widely used in engineering practice. However the applicability of isolating piles is rarely studied. Taking the shield tunnel passing through a bridge of the high speed railway in Nanjing Metro Line 6 as the background, the effect and applicability of isolating piles, and deeply buried shield tunnel traverse rock stratum, are studied. The analysis of numerical simulation and observation data indicate that under these conditions, the isolation effect of isolating piles are not obvious and the application of isolating piles will have adverse effects on bridge.