土质及软岩边坡地震稳定性影响因素分析
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摘要
汶川地震后,拉剪破裂面已经成为岩土工程界公认的边坡破坏面,传统的剪切破坏面不符合动力边坡破坏的实际情况,文章修正了传统动力时程分析法,提出一种全新的动力边坡稳定性判断方法。此种方法在理论和实际中都有很大优势,为了保证此种方法计算结果的唯一性和准确性,则必须保证判断动力边坡的判据不受其他因素的影响。为此文章通过采用FLAC软件模拟土质及软岩边坡,计算分析弹性模量、时间间隔和局部阻尼系数的选取对土质及软岩边坡动力稳定性安全系数的影响,以此来验证此种动力边坡稳定性判断方法是否可行。
After Wenchuan earthquake,the tensile-shear failure surface has become a recognized slope failure surface in geotechnical world,the traditional shear failure surface does not meet the actual situation of slope failure and this article revises the traditional dynamic time-history analysis,and advances a new method to judge the slope stability.This method has a significant advantage in theory and practice;in order to ensure the uniqueness and accuracy of the results,we must make the criteria uninfluenced by other factors.So this article simulates the seismic slope by using FLAC software,and analyzes the influence of elastic modulus,time intervals and the selection of local damping on the stability safety factor of seismic slop to verify the correctness of the method as a feasible way to judge slope stability.
After Wenchuan earthquake,the tensile-shear failure surface has become a recognized slope failure surface in geotechnical world,the traditional shear failure surface does not meet the actual situation of slope failure and this article revises the traditional dynamic time-history analysis,and advances a new method to judge the slope stability.This method has a significant advantage in theory and practice;in order to ensure the uniqueness and accuracy of the results,we must make the criteria uninfluenced by other factors.So this article simulates the seismic slope by using FLAC software,and analyzes the influence of elastic modulus,time intervals and the selection of local damping on the stability safety factor of seismic slop to verify the correctness of the method as a feasible way to judge slope stability.
引文
[1]郑颖人,叶海林,黄润秋.地震边坡破坏机制及其破裂面的分析探讨[J].岩石力学与工程学报,2009,28(8):1 714-1 723.(Zheng Yingren,Ye Hailin,HuangRunqiu.Study on stability analysis of seismic slope[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(8):1 714-1 723.(in Chinese))
[2]建筑抗震设计规范(GB50011-2001)[S].(Code forSeismic Design of Buildings(GB50011-2001)[S].(inChinese))
[3]刘汉龙,费康,高玉峰.边坡地震稳定性时程分析方法[J].岩土力学,2003,24(4):553-556.(Liu Han-long,Fei Kang,Gao Yufeng.Time history analysismethod of slope seismic stability[J].Rock and Soil Me-chanics,2003,24(4):553-556.(in Chinese))
[4]李海波,肖克强,刘亚群.地震荷载作用下顺层岩质边坡安全系数分析[J].岩石力学与工程学报,2007,26(12),2 385-2 394.(Li Haibo,Xiao Keqiang,Li-uYaqun.Factor of safety analysis of bedding rock slopeunder seismic load[J].Chinese Journal of Rock Me-chanics and Engineering,2007,26(12),2 385-2 394.(in Chinese))
[5]戴妙林,李同春.基于降强法数值计算的复杂岩质边坡动力稳定性安全评价[J].岩石力学与工程学报,2007,26(增1),2 749-2 754.(Dai Miaolin,Li Tong-chun.Analysis of dynamic stability safety evaluation forcomplex rock slopes by strength reduction numericalmethod[J].Chinese Journal of Rock Mechanics and En-gineering,2007,26(Supp.1),2 749-2 754.(in Chi-nese))
[6]郑颖人,陈祖煜,王恭先,等.边坡与滑坡工程治理[M].北京:人民交通出版社,2007.(Zheng Yingren,Chen Zuyu,Wang Gongxian,et al.The engineeringmanagement of slope and landslide[M].Beijing:ChinaCommunications Press,2007.(in Chinese))
[7]张后全,常旭,唐春安.岩石多裂纹剪切断裂数值试验研究[J].岩石力学与工程,2005,24(增):5 136-5 140.(Zhang Houquan,Chang Xu,Tang Chunan.Numerical study on shear failure of jointed rock with se-beral flaws under shear testing[J].Chinese Journal ofRock Mechanics and Engineering,2005,24(Supp.):5136-5 140.(in Chinese)
[8]Wang F W,Cheng Q G,Lynn H,et al.Preliminary in-vestigation of some large landslides triggered by Wen-chuan earthquake in 2008,Sichuan Province,China[J].Landslides,2009,6(1):47-54.
[9]Li X P,Siming H E.Seismically induced slope instabili-ties and the corresponding treatments:the case of a roadin the Wenchuan earthquake hit region[J].Journal ofMountain Science,2009,6(1):96-100.
[10]Itasca Consulting Group Inc..FLAC(Fast LagrangianaAnalysis of Continua)User Manuals(Version 5.0)[R].Minneapolis,Minnesota:Itasca Consulting GroupInc.,2004.
[11]刘波,韩彦辉.FLAC原理、实例与应用指南[M].北京:人民交通出版社,2005.(Liu Bo,Han Yanhui.FLAC principle,examples and application guide[M].Beijing:China Communications Press,2005.(in Chi-nese))
[12]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2008.(Chen Yu-min,Xu Dingping.FLAC/FLAC3D basis and engineer-ing examples[M].Beijing:China Water Power Press,2008.(in Chinese))
[2]建筑抗震设计规范(GB50011-2001)[S].(Code forSeismic Design of Buildings(GB50011-2001)[S].(inChinese))
[3]刘汉龙,费康,高玉峰.边坡地震稳定性时程分析方法[J].岩土力学,2003,24(4):553-556.(Liu Han-long,Fei Kang,Gao Yufeng.Time history analysismethod of slope seismic stability[J].Rock and Soil Me-chanics,2003,24(4):553-556.(in Chinese))
[4]李海波,肖克强,刘亚群.地震荷载作用下顺层岩质边坡安全系数分析[J].岩石力学与工程学报,2007,26(12),2 385-2 394.(Li Haibo,Xiao Keqiang,Li-uYaqun.Factor of safety analysis of bedding rock slopeunder seismic load[J].Chinese Journal of Rock Me-chanics and Engineering,2007,26(12),2 385-2 394.(in Chinese))
[5]戴妙林,李同春.基于降强法数值计算的复杂岩质边坡动力稳定性安全评价[J].岩石力学与工程学报,2007,26(增1),2 749-2 754.(Dai Miaolin,Li Tong-chun.Analysis of dynamic stability safety evaluation forcomplex rock slopes by strength reduction numericalmethod[J].Chinese Journal of Rock Mechanics and En-gineering,2007,26(Supp.1),2 749-2 754.(in Chi-nese))
[6]郑颖人,陈祖煜,王恭先,等.边坡与滑坡工程治理[M].北京:人民交通出版社,2007.(Zheng Yingren,Chen Zuyu,Wang Gongxian,et al.The engineeringmanagement of slope and landslide[M].Beijing:ChinaCommunications Press,2007.(in Chinese))
[7]张后全,常旭,唐春安.岩石多裂纹剪切断裂数值试验研究[J].岩石力学与工程,2005,24(增):5 136-5 140.(Zhang Houquan,Chang Xu,Tang Chunan.Numerical study on shear failure of jointed rock with se-beral flaws under shear testing[J].Chinese Journal ofRock Mechanics and Engineering,2005,24(Supp.):5136-5 140.(in Chinese)
[8]Wang F W,Cheng Q G,Lynn H,et al.Preliminary in-vestigation of some large landslides triggered by Wen-chuan earthquake in 2008,Sichuan Province,China[J].Landslides,2009,6(1):47-54.
[9]Li X P,Siming H E.Seismically induced slope instabili-ties and the corresponding treatments:the case of a roadin the Wenchuan earthquake hit region[J].Journal ofMountain Science,2009,6(1):96-100.
[10]Itasca Consulting Group Inc..FLAC(Fast LagrangianaAnalysis of Continua)User Manuals(Version 5.0)[R].Minneapolis,Minnesota:Itasca Consulting GroupInc.,2004.
[11]刘波,韩彦辉.FLAC原理、实例与应用指南[M].北京:人民交通出版社,2005.(Liu Bo,Han Yanhui.FLAC principle,examples and application guide[M].Beijing:China Communications Press,2005.(in Chi-nese))
[12]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2008.(Chen Yu-min,Xu Dingping.FLAC/FLAC3D basis and engineer-ing examples[M].Beijing:China Water Power Press,2008.(in Chinese))
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