大跨度浅埋复杂渡线隧道的施工模拟及其分析  

Numerical Simulation and Analysis of Large-Span and Shallow Tunnel Construction for Metro Connecting Line

作　　者：周江天[1] 

机构地区：[1]北京市市政工程设计研究总院,100082

出　　处：《特种结构》2008年第5期54-58,共5页Special Structures

摘　　要：本文通过对一个复杂渡线隧道施工力学行为模拟分析的具体事例,论述了采用合理的数值分析方法进行模拟计算是十分必要且可行的。通过计算分析,作者认为在第四系地层采用浅埋暗挖法修建城市隧道,限制地表隆陷应重点从隧道施工力学行为着手,包括:主动加固和反复加固以改善地层的承载能力;加强初期支护和一临时支护,实现支护结构快速承载;分步实施、快速封闭,尽量减少对围岩的扰动;加强监控量测,实现信息化施工等技术措施。本文建议,从行业层面建立健全标准统一、操作规范的现场监控量测体系,形成面广、量大可追溯的隧道施工行为数据库,加强隧道施工力学分析的基础资料建设,提升国内隧道建设的总体技术水平。Based on the mechanical behavior simulation and the analysis of a specific complex tunnel for connecting, this paper proves that the numerical simulation and analysis in a reasonable way is necessary and feasible. When the city tunnel in the Quaternary is constructed by the shallow mining method, it is very important to study tunnel mechanical behavior for controlling the ground settlement due to tunnel excavation. The main control measures are as follows ：firstly, improving the bearing capacity of soil by positive and repeating soil reinforcement ; secondly, reinforcing, and closing primary support fleetly, and reducing interference to surrounding soil as possible ; thirdly, strengthening monitoring measurement and accomplishing informatization construction. The writer suggests that the industry unified standards of monitoring system should be established, and large amounts of most traceability tunnel construction database should be built up. Thus, the technical experiences for building tunnels in China could be improved.

关 键 词：浅埋暗挖 大跨度 渡线 有限差分 

分 类 号：U451[建筑科学—桥梁与隧道工程]