摘要
我国目前正处于轨道交通高速发展时期,城市地下空间的开发利用不可避免的会引起地层的扰动,从而导致地表的变形。浅埋暗挖法作为城市地铁重要的施工工法,拟将波纹钢结构应用于浅埋暗挖法施工的隧道初期支护结构中。针对地铁标准区间断面,通过MIDAS GTS NX有限元软件模拟浅埋暗挖法施工的隧道采用波纹钢、钢拱架+混凝土、格栅+混凝土三种不同结构形式作为初期支护结构时支护结构的力学行为表现及地层扰动的控制效果,得出了如下结论:随着开挖的推进,三种初期支护结构在不同施工阶段时的结构应力分布有所不同,三种初支结构的变形趋势相同且都能满足实际施工需求,钢拱架+混凝土的变形最小,波纹钢与钢拱架对地表沉降的控制效果相当,且波纹钢具有更好的经济性。
China is currently in a period of rapid development of rail transit. The development and utilization of urban underground space will inevitably cause disturbance of the stratum, which will lead to the deformation of the surface. As an important construction method of the urban subway, the shallow buried excavation method is proposed to be applied to the initial support structure of the tunnel in the shallow buried underground excavation method in this paper. In this paper, for the standard section of the subway, the MIDAS GTS NX finite element software is used to simulate the tunnel construction of the shallow buried and undercut method, and three different structural types of corrugated steel, steel arch +concrete, and grid + concrete are used as the initial support structure. The mechanical behavior performance of the structure and the control effect of stratum disturbance, the following conclusions are drawn: with the advancement of excavation, the structural stress distribution of the three initial support structures at different construction stages is different. The deformation trend is the same and can meet the actual construction needs. The deformation of the steel arch +concrete is the smallest. The corrugated steel and the steel arch have the same control effect on the surface settlement,and the corrugated steel has better economy.
作者
王文正
孙桐
张艳秋
黄明利
WANG Wenzheng;SUN Tong;ZHANG Yanqiu;HUANG Mingli(The Third Engineering Department of Beijing Municipal Construction Group Co.,Ltd.,Beijing 100176,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S02期1290-1295,共6页
Building Structure
关键词
波纹钢
浅埋暗挖法
初期支护
数值模拟
corrugated steel
shallow burial method
initial support
numerical simulation
