唐家山滑坡后壁残留山体震后稳定性研究
摘要
在对残留边坡现场地质调查基础上,根据坡体表部裂缝分布、延伸长度和贯入深度,结合唐家山高速滑坡形成机制,推测残留山体除表层零星塌滑外,仍存在较大规模滑坡的可能,其破坏模式以坡顶拉张裂缝贯穿下错→坡体中部沿顺层滑移→前缘切层剪切破坏的拉裂–滑移–剪断三段式为特点。根据该破坏模式,对残留山坡分别考虑在天然、持续暴雨以及地震等不同工况下,按二维和三维折线型潜在滑面进行稳定性计算和分析。结果表明,残留山坡整体稳定,但浅表部稳定性差。在此基础上,对残留山坡提出相应的整治措施建议。
Based on the field geological investigations of remnant slope as well as the distribution,scale and penetration depth of crack in slope surface,combined with the mechanism of Tangjiashan high-speed landslide,it is presumed there is still the possibility of that the large-scale landslide except for the sprinkling rockfall occurs on the surface of remnant mountain body.The large-scale landslide failure mode is:tension cracks of slope crest penetrate through bedrock,bedding landslides take place on the middle slope and shear oblique layer on the bottom,and the characteristics can be expressed with tension-sliding-shearing model.According to the failure mode,considering different conditions of natural,continuous rainstorm as well as earthquake,the stability calculation and analysis of remnant mountain body by two-dimensional and three-dimensional broken line potential sliding surfaces are carried out.The results show that the remnant mountain body is stable wholly,but the shallow surface stability is unfavorable,and the control measures to remnant mountain body are proposed.
Based on the field geological investigations of remnant slope as well as the distribution,scale and penetration depth of crack in slope surface,combined with the mechanism of Tangjiashan high-speed landslide,it is presumed there is still the possibility of that the large-scale landslide except for the sprinkling rockfall occurs on the surface of remnant mountain body.The large-scale landslide failure mode is:tension cracks of slope crest penetrate through bedrock,bedding landslides take place on the middle slope and shear oblique layer on the bottom,and the characteristics can be expressed with tension-sliding-shearing model.According to the failure mode,considering different conditions of natural,continuous rainstorm as well as earthquake,the stability calculation and analysis of remnant mountain body by two-dimensional and three-dimensional broken line potential sliding surfaces are carried out.The results show that the remnant mountain body is stable wholly,but the shallow surface stability is unfavorable,and the control measures to remnant mountain body are proposed.
引文
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[16]中华人民共和国国家标准编写组.GB50021–2001岩土工程勘察规范[S].北京:中国建筑工业出版社,2002.(The National Standards Compilation Group of People′s Republic of China.GB50021–2001 Code for investigation of geotechnical engineering[S].Beijing:China Architecture and Building Press,2002.(in Chinese))
[2]黄润秋,李为乐.“5.12”汶川大地震地质灾害的基本特征及其对灾后重建影响的建议[J].中国地质教育,2008,(2):21–24.(HUANG Runqiu,LI Weile.Characteristics of geological disasters of 5.12 Wenchuan earthquake and recommendation on its impact on reconstruction[J].Chinese Geological Education,2008,(2):21–24.(in Chinese))
[3]黄润秋,许强.中国典型灾难性滑坡[M].北京:科学出版社,2008.(HUANG Runqiu,XU Qiang.Catastrophic landslides in China[M].Beijing:Science Press,2008.(in Chinese))
[4]黄润秋.20世纪以来中国的大型滑坡及其发生机制[J].岩石力学与工程学报,2007,26(3):433–454.(HUANG Runqiu.Large-scale landslides and their sliding mechanisms in China since the 20th century[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(3):433–454.(in Chinese))
[5]胡卸文,黄润秋,施裕兵,等.唐家山滑坡堵江机制及堰塞坝溃坝模式分析[J].岩石力学与工程学报,2009,28(1):181–189.(HU Xiewen,HUANG Runqiu,SHI Yubing.Analysis of blocking river mechanism of Tangjiashan landslide and dam-breaking mode of its barrier dam[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(1):181–189.(in Chinese))
[6]PERRIN N D,HANCOX G T.Landslide-dammed lakes in New Zealand—preliminary studies on their distribution,causes and effects[J].Landslide,1990,22(3):1 457–1 465.
[7]SCHUSTER R L,COSTA J E.Effects of landslide damming on hydroelectric projects[C]//Proceedings of the 5th International Association Engineering Geology.[S.l.]:[s.n.],1986:1 295–1 307.
[8]赵尚毅,郑颍人,时卫民,等.用有限元强度折减法求边坡稳定安全系数[J].岩土工程学报,2002,24(3):343–346.(ZHAO Shangyi,ZHENG Yingren,SHI Weimin,et al.Analysis of safety factor of slope by strength reduction FEM[J].Chinese Journal of Geotechnical Engineering,2002,24(3):343–346.(in Chinese))
[9]杨强,朱玲,薛利军.基于三维多重网格法的极限平衡法在锦屏高边坡稳定性分析中的应用[J].岩石力学与工程学报,2005,24(增2):5 313–5 318.(YANG Qiang,ZHU Ling,XUE Lijun.Application of limit equilibrium method to stability analysis of Jinping high slope based on 3D multi-grid method[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(Supp.2):5 313–5 318.(in Chinese))
[10]赵尚毅,郑颍人,时卫民,等.边坡稳定性分析的有限元法[J].地下空间,2001,21(5):450–454.(ZHAO Shangyi,ZHENG Yingren,SHI Weimine,t al.FEM for analysis of slope stability[J].Underground Space,2001,21(5):450–454.(in Chinese))
[11]贾厚华,贺怀建.边坡稳定模糊随机可靠度分析[J].岩土力学,2003,24(4):657–660.(JIA Houhua,HE Huaijian.Analysis of fuzzy-random reliability of slope stalibity[J].Rock and Soil Mechanics,2003,24(4):657–660.(in Chinese))
[12]邓建辉,陈菲,尹虎,等.泸定县四湾村滑坡的地质成因与稳定评价[J].岩石力学与工程学报,2007,26(10):1 945–1 950.(DENG Jianhui,CHEN Fei,YIN Hu,et al.Geological origin and stability evaluation of Siwancun landslide in Luding County[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(10):1 945–1 950.(in Chinese)))
[13]李守定,李晓,吴疆,等.大型基岩顺层滑坡滑带形成演化过程与模式[J].岩石力学与工程学报,2007,26(12):2 473–2 480.(LI Shouding,LI Xiao,WU Jiang,et al.Evolution process and pattern of sliding zone in large consequent bedding rock landslide[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(12):2 473–2 480.(in Chinese))
[14]李守定,李晓,刘艳辉.清江茅坪滑坡形成演化研究[J].岩石力学与工程学报,2006,25(2):377–384.(LI Shouding,LI Xiao,LIU Yanhui.Study of generation and evolution of Maoping landslide on Qingjiang River[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(2):377–384.(in Chinese))
[15]邓建辉,闵弘,魏进兵,等.再论茅坪滑坡的复活机制与治理可行性[J].岩石力学与工程学报,2006,25(12):2 378–2 383.(DENG Jianhui,MIN Hong,WEI Jinbing,et al.Further investigation on reactivation of Maoping landslide and its possible control measures[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(12):2 378–2 383.(in Chinese))
[16]中华人民共和国国家标准编写组.GB50021–2001岩土工程勘察规范[S].北京:中国建筑工业出版社,2002.(The National Standards Compilation Group of People′s Republic of China.GB50021–2001 Code for investigation of geotechnical engineering[S].Beijing:China Architecture and Building Press,2002.(in Chinese))
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