超小净距双线地铁隧道暗挖法对中岩墙稳定性影响分析

Effect Analysis of Middle Rock Wall Stability Based on Subsurface Excavation Method for Super-closely-spaced Double-line Subway

以长沙地铁2号线溁湾镇停车线区间超小净距大断面暗挖隧道为依托,采用有限元软件MIDAS/GTS建立两平行圆形洞室的二维计算模型,对比分析小净距双线隧道不同暗挖方法对中岩墙稳定性的影响,提出了合理的施工方法,对超小净距大断面隧道的设计与施工有着非常重要的理论和实践的研究意义。

Based on the super-closely-spaced and large section subsurface excavation tunnel for stop line section of Rongwan Town station of Changsha Subway Line 2,this paper built a two-dimensional calculation model of two parallel circular cavities by using finite element software MIDAS / GTS,analyzed the middle rock wall stability by different subsurface excavation methods of super-closely-spaced doubleline subway,the reasonable construction method was proposed,which had important theory and practical value for design and construction of super-closely-spaced and large section tunnel.