黄浦江防汛墙施工对既有隧道变形影响分析

Analysis on Influence of Construction of Huangpu River Flood Control Wall on Deformation of Existing Tunnels

摘要:

为了深入分析黄浦江防汛墙施工对既有隧道变形的影响，采用Plaxis有限元计算软件，对防汛墙桩基施工过程中既有盾构隧道的变形进行了模拟，并在对比分析模拟结果与施工期间隧道变形监测数据的基础上，进一步探讨了隧道上方堆载、钻孔灌注桩与隧道净距对隧道沉降的影响。研究结果表明：Plaxis有限元模型能够有效地模拟防汛墙施工对既有隧道的影响，且可作为后续分析的重要工具；桩基与隧道的距离越近，造成的隧道变形越显著，当距离小于1.7 m时，隧道变形将超过报警值；隧道上方堆载对隧道沉降的影响相对不敏感。

Abstract:

To conduct an in-depth analysis on the impact of the construction of the flood control wall along the Huangpu River on the deformation of existing tunnels, the Plaxis finite element software is used to simulate the deformation of the existing shield tunnels during the construction of the flood control wall pile foundations. Based on a comparative analysis of the simulation results and the monitoring data of tunnel deformation during the construction period, the influence of superloading above the tunnel, and the clear distance between the bored cast-in-place piles and the tunnel on the settlement of the tunnel are further discussed. The research findings indicate that the Plaxis finite element model can effectively simulate the impact of flood control wall construction on the existing tunnels and can serve as an important tool for subsequent analysis. The closer the distance between the pile foundation and the tunnel, the more significant the tunnel deformation becomes. When the distance is less than 1.7 m, the tunnel deformation exceeds the alarm threshold. The influence of superloading above the tunnel on tunnel settlement is relatively insensitive.