软岩浅埋大断面隧道近距离下穿高压铁塔影响研究  

Study on the influence of shallow-depth large section tunnel in soft rock under high voltage iron tower in short distance

作　　者：赵斌 ZHAO Bin(China Railway Design Corporation,Tianjin 300412,China)

机构地区：[1]中国铁路设计集团有限公司,天津300142

出　　处：《现代城市轨道交通》2025年第3期34-42,共9页Modern Urban Transit

基　　金：中国铁路设计集团有限公司科技开发课题(2020YY330329)。

摘　　要：在城市轨道交通大断面隧道近距离下穿高压铁塔施工过程中,地表沉降控制难度大,严重时可能引起铁塔倒塌,造成极大的负面社会影响。文章依托重庆市轨道交通18号线区间下穿既有高压铁塔实例,通过Midas GTS NX数值模拟软件建立2种不同工法的三维地层-结构模型,研究施工过程中隧道拱顶沉降、高压铁塔基础沉降等变化规律,分析评价软岩地层大断面隧道施工方法对铁塔基础的影响。研究结果表明:大断面隧道采用CD法和双侧壁导坑法可有效控制隧道拱顶及高压铁塔基础变形;采用双侧壁导坑法时,隧道开挖对地层的扰动范围、隧道拱顶及高压铁塔基础变形等影响均比CD法更小。During the construction process of large section tunnels of urban rail transit passing through high voltage iron towers at close range,it is difficult to control surface settlement,and in severe cases,it may cause tower collapse,resulting in significant social impact and construction risks.This article relies on the example of Chongqing metro line 18 passing through an existing high voltage iron tower,and uses Midas GTS NX numerical simulation software to establish three-dimensional geological structural models for two different construction methods.The study investigates the changes in tunnel arch settlement and high voltage iron tower foundation settlement during the entire construction process,and analyzes and evaluates the impact of large section tunnel construction methods in soft rock formations on iron tower foundations.The research results indicate that the use of CD method and double-sided wall guide method in large section tunnels can effectively control the deformation of tunnel arches and high voltage iron tower foundations;When using the double-sided wall guide method,the disturbance range of the strata,deformation of the tunnel arch and high voltage iron tower foundation caused by tunnel excavation are smaller than those caused by the CD method.

关 键 词：城市轨道交通 大断面隧道 下穿施工 高压铁塔 稳定性分析 

分 类 号：U231.3[交通运输工程—道路与铁道工程]