青藏线多年冻土区斜坡路基地震稳定分析及抗滑措施研究
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摘要
多年冻土区斜坡路基的稳定性关系到青藏线格拉段的运营畅通。为研究地震荷载对多年冻土区斜坡路基稳定性的影响,根据现场钻孔及室内土工试验土层参数,针对多年冻土区典型斜坡路基工点,考虑地震荷载作用下,采用边坡稳定性动力分析方法,对有车和无车2种工况,进行了无加固措施情况及抗滑桩情况的稳定性分析和对比研究,明确了抗滑桩提高冻土区斜坡路基稳定性的效果,建议使桩伸入到稳定岩土层下的长度不小于总桩长的1/3,以满足抗滑桩设计和稳定性的要求,为青藏线多年冻土路基加固的设计、施工等提供参考。
The stability of permafrost sloping subgrade relates to the unblocked operation of Qinghai-Tibet Railway. To study the influence of earthquake on the stability of permafrost sloping subgrade,on the basis of soil parameters determined by field drilling and geotechnical tests,the stabilities of such embankment with no stabilization measures as well as that with anti-slide piles under earthquake were analyzed,using the dynamic analysis method of slope stability. Comparison research with and without train running on the line was carried out. The effects of improvement of anti-slide piles on the stability of permafrost sloping subgrade were made clear. It is suggested that the length of the pile inserted into the stable rock is not less than 1/3 of the whole pile length so as to meet the need of reliability and stability requirements which can make a reference for the stabilizing design and construction of permafrost sloping subgrade on Qinghai-Tibet Railway.
The stability of permafrost sloping subgrade relates to the unblocked operation of Qinghai-Tibet Railway. To study the influence of earthquake on the stability of permafrost sloping subgrade,on the basis of soil parameters determined by field drilling and geotechnical tests,the stabilities of such embankment with no stabilization measures as well as that with anti-slide piles under earthquake were analyzed,using the dynamic analysis method of slope stability. Comparison research with and without train running on the line was carried out. The effects of improvement of anti-slide piles on the stability of permafrost sloping subgrade were made clear. It is suggested that the length of the pile inserted into the stable rock is not less than 1/3 of the whole pile length so as to meet the need of reliability and stability requirements which can make a reference for the stabilizing design and construction of permafrost sloping subgrade on Qinghai-Tibet Railway.
引文
[1]徐春柳.青藏线将建地震预警系统[N].地质勘查导报,2006,6,29(1).Xu Chunliu.Earthquake Forewarn system will be established on Qinghai-Tibet Railway[N].Guiding Gournal of Geological Survey,2006,6,29(1).(in Chinese)
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[11]高涛,毛巨省,罗建峰,等.SLOPE/W程序在土质边坡稳定性分析中的应用[J].西安科技大学学报,2006,6(2):184-188.Gao Tao,Mao Jusheng,Luo Jianfeng,et al.Application of SLOPE/W in the stability of soil slope[J].Journal of Xi’an University of Science and Technology,2006,6(2):184-188.(in Chinese)
[12]陆少云,刘祖德.地震对边斜坡稳定性的影响研究[J].安全与环境工程,2007,14(1):1-3.Lu Shaoyun,Liu Zude.Study on Earthquake Effect of Margin Slope Stability[J].Safety and Environmental Engineering,2007,14(1):1-3.(in Chinese)
[13]苏谦,唐第甲,刘深.青藏斜坡冻土冻融循环物理力学性质试验[J].岩石力学与工程学报,2008,27(1):2990-2994.Su Qian,Tang Dijia,Liu Shen.Test on Physico-Mechanical Properties of Qinghai-Tibet Slope Clay Under Freezing-Thawing Cycles Freezing-Thawing[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(1):2990-2994.(in Chinese)
[14]铁道第二勘察设计院,TB10025-2001.铁路路基支档结构设计规范[S].中国北京:中国铁道出版社,2003:43-47.China Railway Second Survey and Design Institude Group Ltd,TB10025-2001.Code for design on retaining engineering structures of railway subgrade[S].Beijing,China:China Railway Press,2003:43-47.(in Chinese)
[2]苏谦.青藏线(格尔木—拉萨段)多年冻土斜坡路基动态验收及安全评估试验安全评估报告[R].青藏铁路总指挥部,西南交通大学,20060910,2006.Su Qian.Dynamic Acceptance and Safety Evaluation Test of Qinghai-Tibet Railway[R].Qinghai-Tibet Railway General Headquarters,Southwest Jiaotong University,20060910,2006.(in Chinese)
[3]蒋鑫,魏永幸,邱延峻.斜坡软弱地基路堤填筑全过程稳定性[J].交通运输工程学报,2003,3(1):30-34.Jiang Xin,Wei Yongxing,Qiu Yanjun.Stability of Subgrade Embankment on Sloped Weak Ground[J].Jounal of Traffic and Transportation Engineering,2003,3(1):30-34.(in Chinese)
[4]黄雅虹.地震作用下黄土斜坡的稳定性分析预测[J].西北地震学报,1998,20(3):52-58.Huang Yahong.Analysis and Predition for Stability of Loess Slope Under the Effect of Earthquakes[J].Northwestern Seismological Journal,1998,20(3):52-58.(in Chinese)
[5]郭俊英,石玉成.地震动特性对黄土斜坡稳定性的影响分析[J].西北地震学报,2004,26(3):250-253.Guo Junying,Shi Yucheng.Earthquake Motion to Loess Slope Instability[J].Analysis on Influence of Northwestern Seismological Journal,2004,26(3):250-253.(in Chinese)
[6]祁生文,许强,刘春玲,等.汶川地震极重灾区地质背景及次生斜坡灾害空间发育规律[J].工程地质学报,2009,17(1):39-49.Qi Wensheng,Xu Qiang,Liu Chunling,et al.Slope Instabilities in the Severest Disaster Areas of Wenchuan Earthquake[J].Journal of Engineering Geology,2009,17(1):39-49.(in Chinese)
[7]屈建军,李建林.岸堤边坡地震反应影响的有限元分析[J].水运工程,2009,2(2):19-21.Qu Jianjun,Li Jianlin.Finite Element Analysis of Seismic Response on Levee Slope[J].Port﹠Waterway Engineering,2009,2(2):19-21.(in Chinese)
[8]郑颖人,赵尚毅,梁斌等.抗滑桩设计新方法—有限元强度折减法[C]//第十届中国科协年会论文集(四),2008,4:230-243.Zheng Yingren,Zhao Shangyi,Liang Bin.New Method of Designing Anti-slide pile—The Strength Reduction of FEM[C]//Symposium of the10th annual meeting of technology association,2008,4:230-243.(in Chinese)
[9]肖武权,阮波.滑坡整治中抗滑桩的优化设计方法[J].中国铁道科学,2006,27(6):7-11.Xiao Wuquan,Ruan Bo.Optimization Design Methods of the Stabilizing Piles in Landslide Treatment[J].China Railway Science,2006,27(6):7-11.(in Chinese)
[10]周波,彭社琴,赵其华.抗滑桩施工中边坡稳定系数分析[J].防灾减灾工程学报,2006,26(1):73-77.Zhou Bo,Peng Sheqin,Zhao Qihua.The Effect of Excavation on the Safety Factor of Slope in Slide-resistant Piles Construction[J].Journal of Disaster Prevention and Mitilation Engineering,2006,26(1):73-77.(in Chinese)
[11]高涛,毛巨省,罗建峰,等.SLOPE/W程序在土质边坡稳定性分析中的应用[J].西安科技大学学报,2006,6(2):184-188.Gao Tao,Mao Jusheng,Luo Jianfeng,et al.Application of SLOPE/W in the stability of soil slope[J].Journal of Xi’an University of Science and Technology,2006,6(2):184-188.(in Chinese)
[12]陆少云,刘祖德.地震对边斜坡稳定性的影响研究[J].安全与环境工程,2007,14(1):1-3.Lu Shaoyun,Liu Zude.Study on Earthquake Effect of Margin Slope Stability[J].Safety and Environmental Engineering,2007,14(1):1-3.(in Chinese)
[13]苏谦,唐第甲,刘深.青藏斜坡冻土冻融循环物理力学性质试验[J].岩石力学与工程学报,2008,27(1):2990-2994.Su Qian,Tang Dijia,Liu Shen.Test on Physico-Mechanical Properties of Qinghai-Tibet Slope Clay Under Freezing-Thawing Cycles Freezing-Thawing[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(1):2990-2994.(in Chinese)
[14]铁道第二勘察设计院,TB10025-2001.铁路路基支档结构设计规范[S].中国北京:中国铁道出版社,2003:43-47.China Railway Second Survey and Design Institude Group Ltd,TB10025-2001.Code for design on retaining engineering structures of railway subgrade[S].Beijing,China:China Railway Press,2003:43-47.(in Chinese)
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