宝塔山特长隧道岩体应力场特征分析
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摘要
宝塔山隧道全长10 480 m,最大埋深600 m,属目前山西省最长的公路隧道。复杂的地形地貌条件以及地质构造影响,使得隧道区地应力分布复杂。为研究隧道区岩体应力场特征,首先介绍了水压致裂法地应力测试成果,以此为基础通过有限元分析得到应力剖面,最后从地形地貌、地质构造、地质力学角度综合分析了区域构造应力场。结果表明,测试范围内地应力大小属于中等应力水平,隧道设计高程处最大水平主应力方位大部分集中在N42°E~N56°E,现场测试及有限元分析所得地应力场与区域构造应力场相符。
Baotashan tunnel is the longest highway tunnel in Shanxi province with a full length of 10 480 m and a maximum burial depth of 600 m.The complex topography and geomorphology and geological structures give rise to a complicated in-situ stress distribution in the tunnel area.To study the characteristics of rock in-situ stress field in the tunnel area,this paper firstly present the measured results of geostress by hydro-fracturing method,based on which the stress profile along the tunnel is obtained by FEM analysis,and finally the regional tectonic stress field is comprehensively analyzed from perspectives of topography and geomorphology,geologic structure,and geomechanics.The research manifested that in-situ stress in the test area can be defined as middle level stress,and the maximum horizontal principal stress in the tunnel design elevation is mainly concentrated in N42°E～N56°E,and regional tectonic stress field is consistent with in-situ stress field achieved by site test and numerical simulation.
Baotashan tunnel is the longest highway tunnel in Shanxi province with a full length of 10 480 m and a maximum burial depth of 600 m.The complex topography and geomorphology and geological structures give rise to a complicated in-situ stress distribution in the tunnel area.To study the characteristics of rock in-situ stress field in the tunnel area,this paper firstly present the measured results of geostress by hydro-fracturing method,based on which the stress profile along the tunnel is obtained by FEM analysis,and finally the regional tectonic stress field is comprehensively analyzed from perspectives of topography and geomorphology,geologic structure,and geomechanics.The research manifested that in-situ stress in the test area can be defined as middle level stress,and the maximum horizontal principal stress in the tunnel design elevation is mainly concentrated in N42°E～N56°E,and regional tectonic stress field is consistent with in-situ stress field achieved by site test and numerical simulation.
引文
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[10]谢新生,肖振敏,王维襄.晋中南断陷盆地中新生代构造演化及临汾盆地现今构造应力场研究[C]∥国家地震局地壳应力研究所.地壳构造与地壳应力文集.北京:地震出版社,1996,111-118.(XIE Xin-sheng,XI-AO Zhen-min,WANG Wei-xiang.Tectonic Evolution ofMeso-Cenozoic Fault Basins of Adjacent Area in MiddleSouthern of Shanxi Province and the Present TectonicStress Field in Linfen Basin[C]∥Institute of Crustal Dy-namic of State Seismological Bureau.Proc.of the 9thCrustal Tectonic and Stress.Beijing:Earthquake Press,1997,154-160.(in Chinese))
[11]王秀文,赵文星,杨国华.山西地堑系的最新水平运动[J].山西地震,2004,(1):20-24.(WANG Xiu-wen,ZHAO Wen-xing,YANG Guo-hua.The Lasers HorizontalMovement of Shanxi Graben System[J].Earthquake Re-search in Shanxi,2004,(1):20-24.(in Chinese))
[12]安美建,李方全.山西地堑系现今构造应力场[J].地震学报.1998,20(5):461-465.(AN Mei-jian,LIFang-quan.The Current Tectonic Stress Field in ShanxiGraben System[J].ACTA Seismologica Sinica.1998,20(5):461-465.(in Chinese))
[2]刘允芳.岩体应力与工程建设[M].武汉:湖北科学技术出版社,2000.(LIU Yun-fang.Geostress and Engineering Construction[M].Wuhan:Hubei TechnologyPress,2000.(in Chinese))
[3]尹健民,罗超文,艾凯.某隧道区地应力测试与岩爆分析[J].岩土力学,2003,24(增1):28-30.(YINJian-min,LUO Chao-wen,AI Kai.Geostress Determina-tion and Rockburst Analysis for an Expressway Tunnel[J].Rock and Soil Mechanics,2003,24(S1):28-30.(in Chinese))
[4]GB50218-94,工程岩体分级标准[S].(GB50218-94,Standard for Engineering Classification of Rock Mas-ses[S].(in Chinese))
[5]郭喜峰,尹健民,刘元坤,等.清远抽水蓄能电站地应力场有限元回归分析[J].长江科学院院报,2008,25(5):55-58.(GUO Xi-feng,YIN Jian-min,LIU Yuan-kun,et al.FEM Regression Analysis of In-situ StressField For Qingyuan Pumped Storage Power Plant[J].Journal of Yangtze River Scientific Research Institute,2008,25(5):55-58.(in Chinese))
[6]曾佐勋,樊光明.构造地质学[M].武汉:中国地质大学出版社,1990.(ZENG Zuo-xun,FAN Guang-ming.Structural Geology[M].Wuhan:China University ofGeosciences Press,1990.(in Chinese))
[7]康红普,林健,颜立新,等.山西煤矿矿区井下地应力场分布特征研究[J].地球物理学报,2009,52(7):1782-1792.(KANG Hong-pu,LIN Jian,YAN Li-xin,et al.Study on Characteristics of Underground In-si-tu Stress Distribution in Shanxi Coal Mining Fields[J].Chinese Journal of Geophysics,2009,52(7):1782-1792.(in Chinese))
[8]张延新,蔡美峰.地应力场与地质构造运动关系研究[J].铜业工程,2004,(3):7-9.(ZHANG Yan-xin,CAI Mei-feng.Study on the Relationship Between In-situStress Field and Tectonization[J].Copper Engineering,2004,(3):7-9.(in Chinese))
[9]成尔林,张美芳.山西地堑系现代北西-北北西向拉张应力场[J].西北地震学报,1990,12(4):20-25.(CHENG Er-lin,ZHANG Mei-fang.Modern NW-NWWTension Stress Field of Rift Valley Series in Shanxi Prov-ince[J].Northwestern Seismological Journal,1990,12(4):20-25.(in Chinese))
[10]谢新生,肖振敏,王维襄.晋中南断陷盆地中新生代构造演化及临汾盆地现今构造应力场研究[C]∥国家地震局地壳应力研究所.地壳构造与地壳应力文集.北京:地震出版社,1996,111-118.(XIE Xin-sheng,XI-AO Zhen-min,WANG Wei-xiang.Tectonic Evolution ofMeso-Cenozoic Fault Basins of Adjacent Area in MiddleSouthern of Shanxi Province and the Present TectonicStress Field in Linfen Basin[C]∥Institute of Crustal Dy-namic of State Seismological Bureau.Proc.of the 9thCrustal Tectonic and Stress.Beijing:Earthquake Press,1997,154-160.(in Chinese))
[11]王秀文,赵文星,杨国华.山西地堑系的最新水平运动[J].山西地震,2004,(1):20-24.(WANG Xiu-wen,ZHAO Wen-xing,YANG Guo-hua.The Lasers HorizontalMovement of Shanxi Graben System[J].Earthquake Re-search in Shanxi,2004,(1):20-24.(in Chinese))
[12]安美建,李方全.山西地堑系现今构造应力场[J].地震学报.1998,20(5):461-465.(AN Mei-jian,LIFang-quan.The Current Tectonic Stress Field in ShanxiGraben System[J].ACTA Seismologica Sinica.1998,20(5):461-465.(in Chinese))
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