Back Analysis and Grading Evaluation of Surrounding Rock Primary Stress in a Railway Tunnel
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摘要: 隧道围岩初始应力分析评价是进行围岩稳定性分析、实现隧道安全快速掘进的前提.采用位移反演分析和场区构造地应力分析2种方法,对旧堡隧道围岩初始应力状态进行分级评价.研究表明,开挖区段隧道横截面上平行洞轴方向为最大主应力方向,围岩的最大、最小主应力均大于自重应力,岩石强度应力比低,该隧道围岩的初始应力属于高地应力.Abstract: The study and evaluation of primary stress of tunnel surrrounding rocks is a necessary premise of conducting stability analysis of surrounding rocks and achieving and quick safe tunnel excavation.Two methods,including displacement back analysis and in-situ geological structure stress analysis,are taken to conduct grading cvaluation on primary stress condition in a railway tunnel.The study results show that the direction of paralleling axis of the tunnel on cross section is the direction of maximum main stress,and both the maximum main stress and the minimum main stress in surrounding rocks are larger than self-weight stress,and the ratio of stress to strength in surrounding rocks will be large.Therefore,the surrounding primary stress state in the tunnel is in high level earth stress.
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Keywords:
- tunnel /
- surrounding rock primary stress /
- high level earth stress /
- back analysis
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[1] 刘宁,朱维申,于广明,等.高地应力条件下围岩劈裂破坏的判据及薄板力学模型研究[J].岩石力学与工程学报,2008,27(增1):3173-3179.LIU Ning,ZHU Wei-shen,YU Guang-ming,et al.Research on mechanical model of thin plate and splitting failure criterionfor surrounding rocks with high geostress[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(Supp 1):3173-3179.(in Chinese) [2] 靳晓光,王兰生,李晓红.地下工程围岩二次应力场的现场测试与监测[J].岩石力学与工程学报,2002,21(5):651-653.JIN Xiao-guang,WANG Lan-sheng,LI Xiao-hong.Site testing and monitoring of induced stress field in surrounding rocks ofunder ground engineering[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(5):651-653.(in Chinese) [3] 江权,冯夏庭,苏国韶,等.基于松动圈–位移增量监测信息的高地应力下洞室群岩体力学参数的智能反分析[J].岩石力学与工程学报,2007,26(增1):2654-2662.JIANG Quan,FENG Xia-ting,SU Guo-shao,et al.Intelligent back analysis of rock mass parameters for large undergroundcaverns under high earth stress based on EDZ and increment displacement[J].Chinese Journal of Rock Mechanics andEngineering,2007,26(Supp 1):2654-2662.(in Chinese) [4] 刘志春,朱永全,李文江,等.挤压性围岩隧道大变形机理及分级标准研究[J].岩土工程学报,2008,30(5):690-697.LIU Zhi-chun,ZHU Yong-quan,LI Wen-jiang,et al.Mechanism and classification criterion for large deformation of squeezingground tunnels[J].Chinese Journal of Geotechnical Engineering,2008,30(5):690-697.(in Chinese) [5] 王成虎,郭啟良,丁立丰,等.工程区高地应力判据研究及实例分析[J].岩土力学,2009,30(8):2359-2364.WANG Cheng-hu,GUO Qi-liang,DING Li-feng,et al.High in-situ stress criteria for engineering area and a case analysis[J].Rock and Soil Mechanics,2009,30(8):2359-2364.(in Chinese) [6] 赵其华,陈近中,彭社琴.高地应力条件下围岩质量分类方法研究[J].地球科学进展,2008,23(5):482-488.ZHAO Qi-hua,CHEN Jin-zhong,PENG She-qin.Study on surrounding rock quality classification motheds in high primarystress condition[J].Advances in Earth Science,2008,23(5):482-488.(in Chinese) [7] CHU Bin-lin,HSU Sun-chi,CHANG Y-Long,et al.Mechanical behavior of a twin-tunnel in multi-layered formations[J].Tunnelling and Underground Space Technology,2007(22):351-362.
[8] 干昆蓉.某铁路隧道高地应力、高水压围岩级别修正探索[J].铁道工程学报,2008(3):64-67.GAN Kun-rong.Exploration on the modification of grades of surrounding rock of a railway tunnel with high land stress and highwater pressure[J].Journal of Railway Eengineering Society,2008(3):64-67.(in Chinese) [9] 赵运臣,刘强.高地应力区挤压破碎围岩隧道施工技术探讨[J].隧道建设,2005,25(6):20-24.ZHAO Yun-chen,LIU Qiang.Discussions on construction technology of tunnels in squeezing and fractured ground in highground-stress area[J].Tunnel Construction,2005,25(6):20-24.(in Chinese) [10] 李树军.高地应力大变形隧道变形特性及工程应对措施分析[J].水利与建筑工程学报,2009,7(3):33-35.LI Shu-jun.Analysis on deformation characteristics and counter measures about high ground stress and big distortion tunnel[J].Journal of Water Resources and Architectural Engineering,2009,7(3):33-35.(in Chinese) [11] 曾庆利,孙福星.张集铁路旧堡隧道地应力与围岩变形专题研究报告[S].太原:中铁十二局集团有限公司,2009.5.ZENG Qing-li,SUN Fu-xing.Report on surrounding rock primary stress and deformation of a radlway tunnel[S].Taiyuan:China Railway 12th Bureau Group Co.,Ltd.,2009.5.(in Chinese)
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