乌鞘岭隧道三维地应力场多元有限元回归拓展分析
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.
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.
引文
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[21]中铁西南科学研究院.乌鞘岭隧道岭脊地段复杂应力条件下的变形控制技术研究专题报告:三维变形监测阶段成果报告[R].成都:中铁西南科学研究院,2005.(Southwest Research Institute of CREC.The subject research report of displacement control technique of Wushaoling tunnel under complicated stress:phase report of3D deformation monitoring[R].Chengdu:Southwest Research Institute of CREC,2005.(in Chinese))
[2]刘赪.秦岭隧道建造关键技术[J].中国铁道科学,2003,24(2):132–136.(LIU Cheng.The key technology in constructing the Qinling tunnel[J].China Railway Science,2003,24(2):132–136.(in Chinese))
[3]梁文灏,李国良.乌鞘岭特长隧道方案设计[J].现代隧道技术,2004,41(2):1–7.(LIANG Wenhao,LI Guoliang.Tentative project of Wushaoling tunnel[J].Modern Tunnelling Technology,2004,41(2):1–7.(in Chinese))
[4]赵德安,蔡小林,SWOBODA G,等.锚杆单元及其在黄土隧道计算中的若干问题[J].岩石力学与工程学报,2004,23(24):4183–4189.(ZHAO Dean,CAI Xiaolin,SWOBODA G,et al.Some problems associated with analysis of tunnels in loess using bolt elements[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(24):4183–4189.(in Chinese))
[5]赵德安,蔡小林,陈志敏,等.侧压力系数对隧道衬砌力学行为的影响分析[J].岩石力学与工程学报,2003,22(增2):2857–2860.(ZHAO Dean,CAI Xiaolin,CHEN Zhimin,et al.Influence of side-pressure coefficient on mechanical behavior of tunnel lining[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(Supp.2):2857–2860.(in Chinese))
[6]赵德安,陈志敏,蔡小林,等.中国地应力场分布规律统计分析[J].岩石力学与工程学报,2007,26(6):1265–1271.(ZHAO Dean,CHEN Zhimin,CAI Xiaolin,et al.Analysis of the distribution rule of geostress in China[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(6):1265–1271.(in Chinese))
[7]邱祥波,李术才,李树忱.三维地应力回归分析方法与工程应用[J].岩石力学与工程学报,2003,22(10):1613–1617.(QIU Xiangbo,LI Shucai,LI Shuchen.3D geostress regression analysis method and its application[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(10):1613–1617.(in Chinese))
[8]杨林德.岩土工程问题的反演理论与实践[M].北京:科学出版社,1995.(YANG Linde.Back analysis theory for geotechnical engineering and its engineering application[M].Beijing:Science Press,1995.(in Chinese))
[9]联想集团有限公司高性能服务器事业部.联想深腾1800机群系统[R].北京:联想集团,2002.(Legend group Ltd.Legend deep comp.1800cluster system[R].Beijing:Lenovo Group.,2002.(in Chinese))
[10]周纪芗.实用回归分析方法[M].上海:上海科学技术出版社,1990.(ZHOU Jixiang.Practical regressive analysis method[M].Shanghai:Shanghai Scientific and Technical Publishers,1990.(in Chinese))
[11]蔡美峰,何满潮,刘东燕.岩石力学与工程[M].北京:科学出版社,2002.(CAI Meifeng,HE Manchao,LIU Dongyan.Rock mechanics and engineering[M].Beijing:Science Press,2002.(in Chinese))
[12]蔡美峰.地应力测量原理和技术[M].北京:科学出版社,2000.(CAI Meifeng.Principle and techniques of in-situ stress measurement[M].Beijing:Science Press,2000.(in Chinese))
[13]ANSYS,Inc.APDL Programmer's guide[R].[S.l.]:ANSYS,Inc.,2004.
[14]ANSYS,Inc.Theory reference[R].[S.l.]:ANSYS,Inc.,2004.
[15]彭国伦.Fortran95程序设计[M].北京:中国电力出版社,2002.(PENG Guolun.Fortran95program design[M].Beijing:China Electric Power Press,2002.(in Chinese))
[16]张奇华,钟作武,龚壁新.施加边界位移产生纯剪应力及反分析应用[J].长江科学院院报,2000,17(2):34–36.(ZHANG Qihua,ZHONG Zuowu,GONG Bixin.Method of generating pure shear stress by adding boundary displacement and its application to back analysis for geostress field[J].Journal of Yangtze River Scientific Research Institute,2000,17(2):34–36.(in Chinese))
[17]中国地震局地壳应力研究所.兰武二线乌鞘岭特长铁路隧道水压致裂地应力测量报告[R].北京:中国地震局地壳应力研究所,2004.(The Institute of Crustal Dynamics,China Earthquake Administration.Measurement Report of Hydraulic Fracturing of Wushaoling Tunnel[R].Beijing:The Institute of Crustal Dynamic,China Earthquake Administration,2004.(in Chinese))
[18]李响,钱伟平.乌鞘岭隧道地质条件综述[J].铁道勘察,2005,(4):57–61.(LI Xiang,QIAN Weiping.Summary for the geological conditions of Wushaoling tunnel[J].Railway Investigation and Surveying,2005,(4):57–61.(in Chinese))
[19]铁道第一勘察设计院.乌鞘岭隧道岭脊地段复杂应力条件下的变形控制技术研究总报告[R].兰州:铁道第一勘察设计院,2005.(The First Survey and Design Institute of China Railways.Research report of displacement control technique of Wushaoling tunnel under complicated stress[R].Lanzhou:The First Survey and Design Institute of China Railways,2005.(in Chinese))
[20]石家庄铁道学院.乌鞘岭隧道岭脊地段复杂应力条件下的变形控制技术研究专题报告:现场测试阶段成果报告[R].石家庄:石家庄铁道学院,2005.(Shijiazhuang Railway Institute.The subject research report of displacement control technique of Wushaoling tunnel under complicated stress:report of in-situ measurement[R].Shijiazhuang:Shijiazhuang Railway Institute,2005.(in Chinese))
[21]中铁西南科学研究院.乌鞘岭隧道岭脊地段复杂应力条件下的变形控制技术研究专题报告:三维变形监测阶段成果报告[R].成都:中铁西南科学研究院,2005.(Southwest Research Institute of CREC.The subject research report of displacement control technique of Wushaoling tunnel under complicated stress:phase report of3D deformation monitoring[R].Chengdu:Southwest Research Institute of CREC,2005.(in Chinese))
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