三峡库区某滑坡地震动力响应机理分析
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摘要
以三峡库区某滑坡为研究对象,运用Geo-studio软件中的quake/w、slope/w和sigma/w程序,通过输入设计烈度为7的人工合成地震动力条件,研究了滑坡受地震动力作用过程中的变形规律,超孔隙水压力及有效应力的变化,震动液化及土体强度的变化以及震后应力重分布情况等,并分析了地震致滑机理。研究结果表明,坡体表层震动强度有所扩大;震动初始阶段,滑坡整体变形具有依次向上传递性,之后坡体前部中部后部变形呈此起彼伏的循环变化特征;厚度较大的滑坡前部主要发生弹性变形,较薄的滑坡后部则主要发生塑性变形;对于粘性土质滑坡,在地震动力作用下坡内产生的超孔隙水压力较小,对其稳定性影响不大,致滑的主要因素为地震惯性力的作用和土体强度的降低。该滑坡在本文所设计的地震动力条件下的破坏方式为:坡体后缘上方堆积体向下崩塌,中部土体向上隆起,前缘滑带处发生剪切破坏。
With the help of quake / w,slope / w and sigma / w programs in the Geo-studio software developed by Canada,this test researches the dynamic responses of a landslide in The Three Gorges Reservoir area under the action of seismic dynamic load with its intensity designed to be seven. The research includes the deformation,excess pore water pressure,effective stress,liquidation and the soil strength reduction during the process of earthquake and the stress redistribution after the earthquake. At the last,the text gives a thorough analysis on the sliding mechanism under the action of earthquake. The results show that the vibration strength on the surface of the landslide is amplified; the deformation transfers from the bottom to the top of the landslide at the initial stage and after which the deformation regularity of different parts of the landslide is that as one falls another rises; the part at front of the landslide deforms elastically while the back deforms plastically; as for the landslide composed of cohesive soil,the main factors contributing to the instability are the earthquake inertia force and the soil strength reduction instead of the excess pore water pressure. In this seismic dynamic load,the failure mechanisms of this landslide are that the deposit at the back of the landslide collapses alongthe sliding surface,the soil in the middle part swells up in the direction perpendicular to the sliding surface,the sliding zone at the front failures by shear.
引文
[1]Keefer D K.Landslides caused by earthquakes[J].Geological Society of America Bulletin,1984,95(4):406-421.
    [2]许冲,戴福初,徐素宁,等.基于逻辑回归模型的汶川地震滑坡危险性评价与检验[J].水文地质工程地质,2013,40(3):98-104.XU Chong,DAI Fuchu,XU Suning,et al.Application of logistic regression model on the Wenchuan earthquake triggered landslide hazard mapping and its validation[J].Hydrogeology&Engineering Geology,2013,40(3):98-104.
    [3]黄润秋.汶川8.0级地震触发崩滑灾害机制及其地质力学模式[J].岩石力学与工程学报,2009,28(6):1239-1249.HUANG Runqiu.Mechanism and geomechanical modes of landslide hazards triggered by Wenchuan 8.0Earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(6):1239-1249.
    [4]杨旭朝,崔芳鹏.地震动力作用触发的斜坡崩滑响应研究现状及展望[J].中国地质灾害与防治学报,2011(2):1-13.YANG Xuzhao,CUI Fangpeng.Research progress and prospects on collapsing-sliding response of slope triggered by seismic dynamic action[J].The Chinese Journal of Geological Hazard and Control,2011(2):1-13.
    [5]NEWMARK N M.Effects of earthquakes on dams and embankments[J].Geotechnique,1965,15(2):139-160.
    [6]王思敬.岩石边坡动态稳定性的初步探讨[J].地质科学,1977,12(4):372-376.WANG Sijing.Preliminary notes on the dynamic stability of rock slopes[J].Scientia Geologica Sinica,1977,12(4):372-376.
    [7]KRAMER S L,SMITH M W.Modified Newmark model for seismic displacements of compliant slopes[J].Journal of Geotechnical and GeoenvironmentalEngineering,1997,123(7):635-644.
    [8]薄景山,徐国栋,景立平.土边坡地震反应及其动力稳定性分析[J].地震工程与工程振动,2001,21(2):116-120.BO Jingshan,XU Guodong,JING Li ping.Seismic response and dynamic stability analysis of soil slopes[J].Earthqake Engneerng and Engineering Vibration,2001,21(2):116-120.
    [9]祁生文,伍法权,严复章,等.岩质边坡动力反应分析[M].北京:科学出版社,2007:1-125.QI Shengwen,WU Faquan,YAN Fuzhang,et al.Rock slope dynamic response analysis[M].Beijing:Science Press,2007:1-125.
    [10]王秀英,聂高众,王登伟.利用强震记录分析汶川地震诱发滑坡[J].岩石力学与工程学报,2009,28(11):2369-2376.WANG Xiuying,NIE Gaozhong,WANG Dengwei.Analysis of landslide induced by Wenchuan Earthquake by strong motion records[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(11):2369-2376.
    [11]李忠生.国内外地震滑坡灾害研究综述[J].灾害学,2003,18(4):64-70.LI Zhongsheng.The state of the art of the research on seismic landslide hazard at home and abroad[J].Journal of Catastrophology,2003,18(4):64-70.
    [12]钱海涛,张力方,兰景岩,等.强震作用下山区滑坡稳定临界位移分析[J].岩石力学与工程学报,2012,31(1):2619-2628.QIAN Haitao,ZHANG Lifang,LAN Jingyan,et al.Analyses of critical sliding displacement of landslide induced by strong earthquake in mountainous area[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(1):2619-2628.
    [13]刘洪兵,朱晞.地震中地形放大效应的观测和研究进展[J].世界地震工程,1999,15(3):20-25.LIU Hongbing,ZHU Xi.Advance on topographic amplification effects of seismic response[J].World Information on Earthquake Engineering,1999,15(3):20-25.
    [14]Hutchinson J N.General report:Morphological and geotechnical parameters of landslides in relation to geology and hydrogeology[C]//Bonnard C.proceedings of the 5th International Symposium on Landslides.Lausanne:Rotterdam/Brookfield,1988:3-35.
    [15]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1993.ZHANG Zhaoyuan,WANG Shitian,WANG Lansheng.Engineering geology analysis principle[M].Beijing:Geological Publishing House,1993.
    [16]祁生文,伍法权,刘春玲,等.地震边坡稳定性的工程地质分析[J].岩石力学与工程学报,2004,23(16):2792-2796.QI Shengwen,WU Faquan,LIU Chunling,et al.Engineering geology analysis on stability of slope under earthauake[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(16):2792-2796.
    [17]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(8):1714-1723.ZHENG Yingren,YE Hailin,HUANG Runqiu.Analysis and discussion of failure mechanism and fracture surface of slope under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2009(8):1714-1723.
    [18]文雯,宋廷苏,王珏.单一均质土覆盖层厚度对地表峰值加速度和反应谱平台值的影响[J].地震研究,2012(4):548-554.WEN Wen,SONG Tingsu,WANG Jue.Effects of the thickness of overburden layer with signal homogeneous soil on peak acceleration of ground motions and platform value of the acceleration response spectrum[J].Journal of Seism Ological Research,2012(4):548-554.
    [19]李媛媛,徐扬,吴东.覆盖层厚度对反应谱峰值的影响[J].地震地磁观测与研究,2006(4):33-38.LI Yuanyuan,XU Yang,WU Dong.Effects of the thickness of overlaying layer on response spectrum peak,period corresponding to response spectrum peak,ground peakacceleration and magnifying multiple[J].Seismological and Geomagnetic Observation and Research,2006(4):33-38.
    [20]薄景山,李秀领,刘红帅.土层结构对地表加速度峰值的影响[J].地震工程与工程振动,2003(3):35-40.BO Jingshan,LI Xiuling,LIU Hongshuai.Effects of soil layer construction on peak accelerations of ground motions[J].Earthquake Engineering and Engineering Vibration,2003(3):35-40.
    [21]陈国兴,陈继华.软弱土层的厚度及埋深对深厚软弱场地地震效应的影响[J].世界地震工程,2004(3):66-73.CHEN Guoxing,CHEN Jihua.The effect of depth and thickness of soft soil layer on earthquake responsefor deep soft sites[J].World Earthquake Engineering,2004(3):66-73.

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