汶川大地震山地灾害发育的控制因素分析
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摘要
汶川大地震震后地质灾害调查结果表明,龙门山山地灾害无论是空间分布还是在剖面分布上均具有明显的不均一性:平面上集中在发震断裂及非发震断裂及其附近,剖面上集中在坡顶、坡折及孤立的突出地形上;运动形式具有加速起飞-滑翔-俯冲着陆三阶段。主要受控因素有发震断裂、高烈度、地震持续时间、斜坡地形效应、岩性及结构等。
Our reconnaissance to the mountainous epicenter zones of the Wenchuan Earthquake shows that the geohazard distribution in the Longmen Shan is heterogeneous on both horizontal and vertical directions.The geohazards are concentrated along the seismic fractures and non-seismic fractures in horizontal and at the top,river shoulders and isolated topography in vertical.The movement process can be divided into three stages of zero-length accelerated launching,gliding and-landing.The development of the geo-hazards is controlled by the seismic fracture,high intensity,duration of the earthquake,topography effects,the composed lithology and textures of the mountainous slopes.
Our reconnaissance to the mountainous epicenter zones of the Wenchuan Earthquake shows that the geohazard distribution in the Longmen Shan is heterogeneous on both horizontal and vertical directions.The geohazards are concentrated along the seismic fractures and non-seismic fractures in horizontal and at the top,river shoulders and isolated topography in vertical.The movement process can be divided into three stages of zero-length accelerated launching,gliding and-landing.The development of the geo-hazards is controlled by the seismic fracture,high intensity,duration of the earthquake,topography effects,the composed lithology and textures of the mountainous slopes.
引文
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[3]黄润秋,李为乐.“5.12”汶川大地震触发地质灾害的发育分布规律研究[J].岩石力学与工程学报,2008:(12).Huang Runqiu,Li Weile.A Study on the development and distri-bution rules of geohazards triggered by“5.12”Wenchuan Earth-quake.Chinese Journal of Rock Mechanics and Engineering,2008,(12).
[4]崔鹏,韦方强,陈晓清.汶川地震次生山地灾害及其减灾对策[J].科技赈灾,2008,23(4):317~323.Cui Peng,Wei Fangqiang,Chen Xiaoqing.Geo-hazards inWenehuan Earthquake area and counter measures for disaster re-duction.S&Tfor Disaster Relief,2008,23(4):317~323.
[5]林良俊,方成,李小杰.“5.12”汶川地震灾区地质灾害情况初步分析[J].水文地质与工程地质,2008,(4),1~6.Lin Fangjun,Fang Chen,Li Xiaojie.Brief analysis of geohazardsin"5.12"Wenchuan Earthquake.Hydrology and Engineering ge-ology,2008,(4):1~6.
[6]黄润秋.中国西部岩石高边坡应力场特征及其卸荷破裂机理[J].工程地质学报,2004,23(suppl.):7~13.Huang Runqiu.Geo-stress distribution and unloading fracturingmechanism of high rock slopes in western part of China.Journal ofEngineering Geology,2004,12(suppl.):7~13.
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