乌鞘岭隧道三维地应力场多元有限元回归拓展分析  

THREE-DIMENSIONAL FE REGRESSION ANALYSIS OF MULTIVARIATE GEOSTRESS FIELD OF WUSHAOLING TUNNEL

作　　者：赵德安[1,2] 李国良[3] 陈志敏[1] 李双洋[4] 夏文传[1] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]西北民族大学土木工程学院,甘肃兰州730030 [3]中铁第一勘察设计院集团有限公司,陕西西安710043 [4]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000

出　　处：《岩石力学与工程学报》2009年第A01期2687-2694,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：铁道部科技开发计划项目(2004G043-A);教育部留学回国人员科研启动基金;兰州交通大学青蓝人才工程基金资助项目

摘　　要：采用三维有限元多元回归分析方法,基于有限测点的地应力量测结果,拓展分析隧道区原始宏观地应力场。建立隧道区两个大规模三维计算模型,通过有限元分析软件ANSYS对重力、水平挤压和剪切等4种工况的构造应力场分别进行计算。编制三维地应力场多元回归分析计算机软件MEBA以及与ANSYS的接口程序MEBAC,实现地应力场的多元回归拓展分析,着重分析乌鞘岭隧道岭脊地段的复杂应力状况、应力值的宏观大小和规律,特别是F4,F5,F6,F7断层及其附近的应力状况。宏观地应力场的分析结果表明,乌鞘岭隧道宏观地应力场的主应力方向为N21.2°E,与隧道轴线的夹角为38.2°,断层区隧道衬砌具有纵向挤压和横向受力不对称的特点。区段地应力值高,在隧道轴线位置,最大垂直地应力为32.10MPa,垂直于隧道轴线方向最大水平地应力为21.72MPa。宏观地应力场的分析结果对工程的动态设计与施工具有重要参考价值。The initial geostress field of tunnel area is analyzed by 3D multivariate FE regression based on limited points of in-situ geostress measurement. Two large-scale 3D FE computational models are established. Then geostress including gravity, tectonic stress field for horizontal extrusion and shear in four cases are computed by with ANSYS. And the multivariate regression analysis is carried out by MEBA and MEBAC, which is an interface program connecting MEBA and ANSYS. It is emphasized on the analysis of complicated stress condition and macro, description of stress field around Wushaoling tunnel, especially the stress condition in and around the faults F4, F5, F6 and F7. The results of macro geostress field indicate that the direction of principle stresses is N21.2°E, which forms separation angle of 38.2° to the tunnel axis. The tunnel lining in faults zone is extruded in longitudinal direction and stressed asymmetrically in horizontal direction. The values of the geostress are relatively large. The maximal vertical geostress is 32.10 MPa and the maximal geostress perpendicular to tunnel axis is 21.72 MPa. The results of macro geostress field are very important for dynamic design and construction.

关 键 词：隧道工程 乌鞘岭隧道 岭脊地段 初始地应力 回归分析 有限元 

分 类 号：U45[建筑科学—桥梁与隧道工程]