大坪山隧道初始地应力场有限元回归分析
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摘要
基于大坪山隧道工程地质条件及可能穿越高地应力而带来的深部工程地质问题,结合钻孔有限测点的地应力测量结果,采用三维有限元分析方法对大坪山隧道的初始地应力场进行了拓展分析。通过建立三维地质模型,计算在自重应力、水平X、Y方向挤压和XY面剪切构造等4种工况下的构造应力场。用最小二乘法求解对应的回归系数及实测点的回归计算值,剔除不合理的测点,将计算值与实测值进行对比分析,采用Sufer软件绘制隧道洞轴线主应力等值线图,得出整个工程区特别是重要工程部位的回归初始地应力场。计算结果表明:测点回归值与实测值大部分吻合较好,反演回归得到的地应力场是合理的,符合实际的初始地应力场分布规律。
Based on the engineering geological condition and deep engineering geological problems which might to be brought by high geostress of Daping mountain tunnel and the engineering geological problems brought by high geostress,combined with the data of in-situ stress obtained at limited drilling measuring points,the expansion analysis of initial geostress field of the tunnel area was conducted by 3D FEA method.A 3D FE computational model was established to compute the tectonic stress fields in four cases,including gravity stress,horizontal extrusion in X and Y directions and shear structure in XY plane.The corresponding regression coefficients and the calculation values of the measuring points were solved by using the least square method,and then the calculation values of the unreasonable measuring points was eliminated.Through comparison between the calculated and measured geostresses of measuring points,the principal stress isoline of tunnel axis was plotted by using Sufer software to obtain the regressed initial stress field of the whole area especially the important engineering parts.The result shows that the calculation values agree well with the measured values mostly,which suggests that the geostress field obtained by regression is reasonable and conforms to real distribution regularity of the initial geostress field.
Based on the engineering geological condition and deep engineering geological problems which might to be brought by high geostress of Daping mountain tunnel and the engineering geological problems brought by high geostress,combined with the data of in-situ stress obtained at limited drilling measuring points,the expansion analysis of initial geostress field of the tunnel area was conducted by 3D FEA method.A 3D FE computational model was established to compute the tectonic stress fields in four cases,including gravity stress,horizontal extrusion in X and Y directions and shear structure in XY plane.The corresponding regression coefficients and the calculation values of the measuring points were solved by using the least square method,and then the calculation values of the unreasonable measuring points was eliminated.Through comparison between the calculated and measured geostresses of measuring points,the principal stress isoline of tunnel axis was plotted by using Sufer software to obtain the regressed initial stress field of the whole area especially the important engineering parts.The result shows that the calculation values agree well with the measured values mostly,which suggests that the geostress field obtained by regression is reasonable and conforms to real distribution regularity of the initial geostress field.
引文
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[13]何江达,谢红强,王启智,等.官地水电站坝址区初始地应力场反演分析[J].岩土工程学报,2009,31(2):166-171.HE Jiangda,XIE Hongqiang,WANG Qizhi,et al.Inversion Analysis of Initial Geostress in Dam Site ofGuandi Hydropower Project[J].Chinese Journal ofGeotechnical Engineering,2009,31(2):166-171.
[14]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 GeostressRegression Analysis Method and Its Application[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(10):1613-1617.
[15]汪波,何川,吴德兴.深埋特长公路隧道三维初始应力场的回归分析[J].公路交通科技,2010,27(12):112-117.WANG Bo,HE Chuan,WU Dexing.Regression Analysisof 3D Initial Geostress Field for Deep and Super-longHighway Tunnel[J].Journal of Highway andTransportation Research and Development,2010,27(12):112-117.
[16]KONIETZKY H,KAMP L T,HAMMER H,et al.Numerical Modelling of In-situ Stress Conditions as an Aidin Route Selection for Rail Tunnels in Complex GeologicalFormations in South Germany[J].Computers andGeotechnics,2001,28(6/7):495-516.
[2]王连捷,潘立宙.地应力测量及其在工程中的应用[M].北京:地震出版社,1991.WANG Lianjie,PAN Lizhou.Geostatic StressMeasurement and Its Application in Engineering[M].Beijing:Seismological Press,1991.
[3]刘允芳.岩体应力测试的资料整理及其精度分析[J].岩土工程学报,1983,5(2):110-125.LIU Yunfang.Data Processing Method and PrecisionAnalysis for Rock Stress Measurements[J].ChineseJournal of Geotechnical Engineering,1983,5(2):110-125.
[4]熊平华,苏凯,钱军,等.小范围区域内初始地应力场的多元线性回归[J].水电能源科学,2010,28(6):39-42.XIONG Pinghua,SU Kai,QIAN Jun.Application ofMultivariate Linear Regression to Initial Geostress Filed inSmall Range[J].Water Resources and Power,2010,28(6):39-42.
[5]郭怀志,马启超,薛玺成,等.岩体初始应力场的分析方法[J].岩土工程学报,1983,5(3):64-75.GUO Huaizhi,MA Qichao,XUE Xicheng,et al.TheAnalytical Method of the Initial Stress Held for RockMasses[J].Chinese Journal of GeotechnicalEngineering,1983,5(3):64-75.
[6]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 TechnicalPublisher,1990.
[7]赵德安,李国良,陈志敏,等.乌鞘岭隧道三维地应力场多元有限元回归拓展分析[J].岩石力学与工程学报,2009,28(增1):2687-2694.ZHAO Dean,LI Guoliang,CHEN Zhimin,et al.Three-dimensional FE Regression Analysis of MultivariateGeostress Field of Wushaoling Tunnel[J].ChineseJournal of Rock Mechanics and Engineering,2009,28(S1):2687-2694.
[8]李永松,尹健民,刘元坤,等.阳江抽水蓄能电站地应力场回归分析[J].武汉大学学报:工学版,2007,40(4):69-73.LI Yongsong,YIN Jianmin,LIU Yuankun,et al.Regression Analysis of In-situ Stress Field for YangjiangPumped Storage Plant[J].Engineering Journal of WuhanUniversity:Engineering Edition,2007,40(4):69-73.
[9]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 ofGenerating Pure Shear Stress by Adding BoundaryDisplacement and Its Application in Back Analysis forGeostress Field[J].Journal of Yangtze River ScientificResearch Institute,2000,17(2):34-36.
[10]中国科学院武汉岩土力学研究所.湖北省谷竹高速公路大坪山隧道ZK10(补)、ZK11(补)孔地应力测试报告[R].武汉:中国科学院武汉岩土力学研究所,2010.Institute of Rock and Soil Mechanics of Chinese Academyof Sciences.Report of Measuring Geostress of ZK10 andZK11 of Daping Mountain Tunnel on Hubei Gucheng-ZhuxiExpressway[R].Wuhan:Institute of Rock and SoilMechanics of Chinese Academy of Sciences,2010.
[11]于崇,李海波,李国文,等.大连地下石油储备库地应力场反演分析[J].岩土力学,2010,31(12):3984-3990.YU Chong,LI Haibo,LI Guowen,et al.InversionAnalysis of Initial Stress Field of DalianUnderground Oil Storage Cavern[J].Rock and SoilMechanics,2010,31(12):3984-3990.
[12]张建国,张强勇,杨文东,等.大岗山水电站坝区初始地应力场反演分析[J].岩土力学,2009,30(10):3071-3078.ZHANG Jianguo,ZHANG Qiangyong,YANG Wendong,et al.Regression Analysis of Initial Geostress Field in DamZone of Dagangshan Hydropower Station[J].Rock andSoil Mechanics,2009,30(10):3071-3078.
[13]何江达,谢红强,王启智,等.官地水电站坝址区初始地应力场反演分析[J].岩土工程学报,2009,31(2):166-171.HE Jiangda,XIE Hongqiang,WANG Qizhi,et al.Inversion Analysis of Initial Geostress in Dam Site ofGuandi Hydropower Project[J].Chinese Journal ofGeotechnical Engineering,2009,31(2):166-171.
[14]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 GeostressRegression Analysis Method and Its Application[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(10):1613-1617.
[15]汪波,何川,吴德兴.深埋特长公路隧道三维初始应力场的回归分析[J].公路交通科技,2010,27(12):112-117.WANG Bo,HE Chuan,WU Dexing.Regression Analysisof 3D Initial Geostress Field for Deep and Super-longHighway Tunnel[J].Journal of Highway andTransportation Research and Development,2010,27(12):112-117.
[16]KONIETZKY H,KAMP L T,HAMMER H,et al.Numerical Modelling of In-situ Stress Conditions as an Aidin Route Selection for Rail Tunnels in Complex GeologicalFormations in South Germany[J].Computers andGeotechnics,2001,28(6/7):495-516.
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