新建建筑物荷载对既有隧道沉降影响规律数值模拟分析

Numerical Simulation Analysis of Influence Law of Building Load on Settlement of Existing Tunnel

为研究地上新建建筑物对城市既有隧道产生沉降的影响规律,采用FLAC3D数值模拟软件,建立三维数值模型,分析不同工况下的沉降规律。数值模拟中,将建筑物等效为均布荷载施加到地基上,主要围绕施加不同的建筑荷载、施加建筑荷载的不同位置(建筑物距隧道中心线的距离为8m、13m、18m、23m)以及隧道的不同埋深进行分析研究。新建建筑物的加载过程对既有隧道安全性的影响是不可避免的,为了确保隧道结构的安全性,结合《隧道变形控制标准》(CJJ/T202-2013),对数值模拟结果进行综合分析,本文的研究内容可为今后类似工程提供参考依据。

In order to study the influence law of overground newly-built buildings on settlement of existing tunnels in the city,FLAC3D numerical simulation software was used in this paper to establish a three-dimensional numerical model and analyze the settlement law under different working conditions.In the numerical simulation,the equivalent uniformly distributed load of the building is applied to the foundation,and the analysis and research are mainly carried out around different building loads,different positions of building loads(the distance between the building and the center line of the tunnel is 8m,13m,18m,23m)and different buried depths of the tunnel.It is inevitable that the loading process of new buildings will have an impact on the safety of existing tunnels.In order to ensure the safety of tunnel structures,combined with the Tunnel Deformation Control Standard(CJJ/T202-2013),the numerical simulation results are comprehensively analyzed.The research content of this paper can provide reference for similar projects in the future.