唐家山滑坡成因机制与堰塞坝整体稳定性研究
摘要
根据唐家山滑坡的地质背景,研究滑坡及堰塞体工程地质特征,分析唐家山滑坡类型及发生的地质成因机制;基于唐家山堰塞体的岩体结构稳定性分析、宏观现象监控与地表位移监测,研究堰塞体的整体稳定性。研究得出如下结论与启示:(1)唐家山滑坡属于基岩顺层滑坡,是典型的地震诱发高速滑坡,滑坡滑动带可能发育在层间剪切带,滑坡区发育的构造背景为复式倒转背斜的一翼。(2)唐家山堰塞体整体结构以块状岩体为主,上覆风化松散堆积物,整体地质稳定性较好;堰塞体地表位移监测显示,泄洪对地表位移有影响,最大位移约140mm,随后位移增量较小,目前处于稳定状态。(3)应注重地震诱发滑坡→堰塞湖→溃决→洪水的"多米诺"链式灾变研究;应注重含层间剪切带斜坡的工程地质调查分析和地震滑坡危险性研究。
By geological survey and engineering geological characters analysis of Tangjiashan landslide,the landslide types and geological origin mechanism are studied.On the base of the rock mass structure analysis and surface displacement monitoring,the entire stability of landslide dam is studied.The conclusions are achieved:(1) Tangjiashan landslide is of high speed rock slide triggered by earthquake,and is located in a consequent slope of complex overturned fold.Landslide sliding zone is possibly situated in interbedded shear zone.(2) Landslide dam material is mainly block rock mass overlying with weathered incompact accumulation,and entire stability is good.Flood affected the surface displacement of landslide dam with the maximum displacement of 140 mm.Increment of surface displacement is down after flood,and landslide dam is stable now.(3) The chained hazard study of earthquake landslide→dammed lake→breach→flood with domino effect should be emphasized.Engineering geological survey and seismic risk study of slope are included interbedded shear zone.
By geological survey and engineering geological characters analysis of Tangjiashan landslide,the landslide types and geological origin mechanism are studied.On the base of the rock mass structure analysis and surface displacement monitoring,the entire stability of landslide dam is studied.The conclusions are achieved:(1) Tangjiashan landslide is of high speed rock slide triggered by earthquake,and is located in a consequent slope of complex overturned fold.Landslide sliding zone is possibly situated in interbedded shear zone.(2) Landslide dam material is mainly block rock mass overlying with weathered incompact accumulation,and entire stability is good.Flood affected the surface displacement of landslide dam with the maximum displacement of 140 mm.Increment of surface displacement is down after flood,and landslide dam is stable now.(3) The chained hazard study of earthquake landslide→dammed lake→breach→flood with domino effect should be emphasized.Engineering geological survey and seismic risk study of slope are included interbedded shear zone.
引文
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[2]刘太平.北川水温、断层气异常与绵竹、安县间5.0级地震[J].四川地震,2000,(4):48-52.(LIU Taiping.Abnormal change of water temperature and fault gas and the M5.01999Anxian earthquake[J].Earthquake Research in Sichuan,2000,(4):48-52.(in Chinese))
[3]王永利,贾疏源,倪师军,等.北川县通口水电工程区岩溶发育特征探讨[J].沉积与特提斯地质,2006,26(3):89-92.(WANG Yongli,JIA Shuyuan,NI Shijun,et al.Development of the karsts in the Tongkou hydropower station,Beichuan,Sichuan[J].Sedimentary Geology and Tethyan Geology,2006,26(3):89-92.(in Chinese))
[4]袁犁,童作典.江油至北川一带石炭系灰岩构造变形分析[J].四川建材学院学报,1993,8(3):52-57.(YUAN Li,TONG Zuodian.Study of structure deformation of carboniferous system Carbonate rock in Jiangyou-Beichuan area,Northwestern Sichuan[J].Journal of Sichuan Institute of Building Material,1993,8(3):52-57.(in Chinese))
[5]张德藩.绵阳地区中小型水库病害的工程地质因素[J].四川水利.1993,14(1):43-46.(ZHANG Defang.The engineering geological factors of disease of mid-small reservoir in Mianyang[J].Sichuan Water Conservancy,1993,14(1):43-46.(in Chinese))
[6]王文鹄.绵阳市地貌发育简史[J].西南工学院学报,1998,13(3):72-76.(WANG Wengu.The summary history of landforms evolution in Mianyang[J].Journal of Southwest Institute of Technology.1998,13(3):72-76.(in Chinese))
[7]刘德贵,王宁.绵阳市地区工程地质研究[J].山西建筑,2007,33(10):138-139.(LIU Degui,WANG Ning.Research on regional engineering geology in Mianyang City[J].Shanxi Architecture,2007,33(10):138-139.(in Chinese))
[8]王文鹄.绵阳市境地貌基本特征[J].西南工学院学报,1998,13(1):44-48.(WANG Wengu.The general features of Mianyang municipal landforms[J].Journal of Southwest Institute of Technology,1998,13(1):44-48.(in Chinese))
[9]金文正,汤良杰,杨克明,等.川西龙门山褶皱冲断带分带性变形特征[J].地质学报,2007,81(8):1072-1080.(JIN Wenzheng,TANG Liangjie,YANG Keming,et al.Deformation and zonation of the Longmenshan fold and thrust zone in the Western Sichuan basin[J].Acta Geological Sinica,2007,81(8):1072-1080.(in Chinese))
[10]金文正,汤良杰,杨克明,等.龙门山冲断带构造特征研究主要进展及存在问题探讨[J].地质论评,2008,54(1):37-46.(JIN Wenzheng,TANG Liangjie,YANG Keming,et al.Progress and problem of study on characters of the Longmen Mountain thrust belt[J].Geology Review,2008,54(1):37-46.(in Chinese))
[11]安其美,丁立丰,王海忠,等.龙门山断裂带的性质与活动性研究[J].大地测量与地球动力学,2004,24(2):115-119.(AN Qimei,DING Lifeng,WANG Haizhong,et al.Research of property and activity of Longmen Mountain fault zone[J].Journal of Geodesy and Geodynamics,2004,24(2):115-119.(in Chinese))
[12]余团,何昌荣.龙门山构造带区域稳定性探讨[J].地震研究,2000,23(4):378-383.(YU Tuan,HE Changrong.Research on the regional stability along the structural belt in Longman mountains[J].Journal of Seismological Research,2000,23(4):378-383.(in Chinese))
[13]黄润秋,李为乐.“5.12”汶川大地震触发地质灾害发育分布规律研究[J].岩石力学与工程学报,2008,27(12):2585-2592.(HUANG Runqiu,LI Weile.Research on development and distribution rules of geohazards induced by Wenchuan earthquake on12th May,2008[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(12):2585-2592.(in Chinese))
[14]林良俊,方成,李小杰,等.5.12汶川地震灾区地质灾害情况初步分析[J].水文地质工程地质,2008,35(4):129-132.(LIN Liangjun,FANG Cheng,LI Xiaojie,et al.Geohazard triggered by Wenchuan earthquake on12th May,2008[J].Hydrogeology and Engineering Geology,2008,35(4):129-132.(in Chinese))
[15]殷跃平.汶川八级地震地质灾害研究[J].工程地质学报,2008,16(4):433-444.(YIN Yueping.Researches on the geo-hazards triggered by Wenchuan earthquake,Sichuan[J].Journal of Engineering Geology,2008,16(4):433-444.(in Chinese))
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