基于数值模拟的软岩地层下盾构近接穿越大直径桥梁桩基群施工影响研究——以合肥市轨道交通5号线某盾构区间为例

Research on Construction Influence of Shield Near-crossing Large-diameter Bridge Pile Group under Soft Rock Formation Based on Numerical Simulation——Taking a Shield Section of Hefei Rail Transit Line 5 as an Example

因盾构机近接穿越大直径桥梁桩基群,合肥市轨道交通5号线某盾构区间大直径桩基群施工过程中可能存在一定的安全隐患。对此,文章提出利用数值模拟软件GTS NX分析盾构掘进桩基及土体的沉降、变形影响规律,进一步确定盾构掘进的安全稳定性,并根据自动化监测技术及深层土体沉降结果,验证数值模拟中盾构掘进对桩基群及土体沉降的变化规律,研究成果可为类似工程提供参考。

Due to the shield machine approaching through the large-diameter bridge pile group, there may be some potential safety hazards in the construction of large-diameter pile group in a shield section of Hefei Rail Transit Line 5. In this regard, the paper proposes to use the numerical simulation software GTS NX to analyze the influence laws of the settlement and deformation of pile foundation and soil in shield tunneling, and further determine the safety and stability of shield tunneling. According to the automatic monitoring technology and the results of deep soil settlement, the variation law of shield tunneling on pile foundation group and soil settlement in numerical simulation is verified. The research results can provide references for similar projects.