【摘要】 雅鲁藏布大峡谷是世界第一大峡谷和地球上最深的峡谷,喜马拉雅山脉、念青唐古拉山脉和横断山脉雄踞于大峡谷西、北、东三方,地形呈北高南低走势;该地区地层岩性复杂、断裂构造发育、地震活动性强且震级高、风化卸荷作用强烈、气候条件复杂,地质灾害频发,本文主要探讨大峡谷高位岩质崩塌的影响因素。在卫星遥感解译工作的基础上,利用机载雷达高清航拍手段,通过详细地表地质调查,系统分析了该河段的大地构造背景、地形地貌特征、岸坡地质建造、岸坡地质结构和发震断裂分布等地质条件,从内、外营力作用、岸坡外形、内部结构以及应力状态等方面阐述了高陡岸坡的变形与破坏过程。研究认为,雅鲁藏布大峡谷高位岩质崩塌的主要影响因素有河谷形态、岩性特征、构造条件、地震活动性、地壳隆升与河流下切、高地应力、风化卸荷和气候条件等。崩塌发育是多种因素耦合的结果,最主要的内在因素是岸坡形态与地质结构,最主要的诱发因素是区域破坏性地震的反复作用。更多还原

【Abstract】 The Yarlung Zangbo Grand Canyon is the world ’s first Grand Canyon and the deepest canyon on earth.The Himalaya mountains,the Nyainqentanglha mountains and the Hengduan Mountains are located in the west,north and east of the Grand Canyon,respectively,where the terrain appears to be higher in the north and lower in the south.The area is characterized by complex lithology,developed fault structure,intense earthquake activity,high magnitude,strong weathering and unloading,complex climatic conditions and frequent geological disasters.This paper mainly discusses the main factors affecting the high level rock collapse in the Grand Canyon.On the basis of the interpretation of satellite remote sensing,the airborne radar high-definition aerial photography is used,and the detailed geological survey is carried out.Systemic analysis in this area is conducted including tectonic background,topography,slope geological formation,slope structure and earthquake fault distribution etc.Based on exogenic and endogenic geological process,slope shape,internal structure and stress state and other aspects,the process of deformation and failure of high steep slope is analyzed.The main influencing factors of high level rock collapse in Yarlung Zangbo Grand Canyon include valley morphology,lithology,structural conditions,seismicity,crustal uplift and river cutting,high ground stress,weathering and unloading,and climatic conditions.Collapse development is the result of coupling of various factors.The most important internal factor is bank slope shape and geological structure,and the most important inducing factor is the repeated action of regional destructive earthquakes.更多还原