针对目前黄土隧道变形分析中未考虑围岩结构特性的现状，以平面应变试验为载体，研究了结构性参数与强度参数、围压、含水率及剪应变之间的关联模型；运用 FLAC3D数值软件建立实体隧道三维模型，采用 Fish 语言程序编写，将结构性引入到隧道变形计算中，主要分析围岩土体结构变化对隧道变形的影响。研究结果表明：土体结构性对隧道变形的影响规律，即考虑结构性影响时隧道沉降偏大，传统研究结果偏不安全，需加以重视；提出了通过结构性参数变化规律确定围岩松动圈的思路，为结构性的进一步工程应用提供参考。%Currently the structural characteristic of the surrounding rock is not considered in loess tunnel deformation analysis .Based on the test results of plane strain ,the relationships between the structural parameters and strength param-eters ,water content ,confining pressure and shear strain were analyzed in this paper .The tunnel three-dimensional model was developed by using FLAC3D numerical software .With Fish language programming ,the structural is introduced into the tunnel deformation calculation .The impact of tunnel deformation was analyzed by soil structure changes .The conclu-sions are :the influence law of soil structure to the tunnel deformation is revealed ,considering the structural effect tunnel vertical settlement is larger ,which leads to the conclusion that the normal results is not safe therefore it needs more atten-tion .A new method was proposed which estimates tunnel surrounding rock loose circle by structural parameters changes which lays foundation for the further application .
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