非均质岩层引起的偏压对盾构隧道受力影响分析

Analysis of stress influence of shield tunnel under unsymmetrical ground pressure

西南、西北以及东南等地区地质复杂,对地铁盾构隧道结构有较大影响。文章以贵阳市轨道交通 3 号线为工程背景,采用二维数值模型,对非均质岩层引起偏压受力下的盾构隧道管片受力进行分析,分析结果初步得出分层面上下岩层弹性模量之比、分层面倾角和位置对盾构隧道管片受力的影响规律,以期为相似地质条件下地铁建设提供依据。

The geological conditions in southwest,northwest and southeast regions are complex,which have great impact on the structure of metro shield tunnel.Taking Guiyang rail transit line 3 as an engineering study case,this paper uses two-dimensional numerical model to analyze the stress of shield tunnel segment under unsymmetrical pressure caused by heterogeneous rock stratum.The analysis results preliminarily obtain the infl uence pattern of elastic modulus ratio of upper and lower strata on the stress of shield tunnel segment,inclination angle and position of layered surface,so as to provide basis for subway construction under similar geological conditions.