【摘要】 巫溪县构造上位于南大巴山弧形褶皱带的核心部位,八面山弧形褶皱构造带的北缘,地理上位于三峡库区奉节—巫山段北部,区内以发育近平行的褶皱构造为主,岩层中构造节理裂隙发育。区内地形切割强烈、起伏大,表现为中高山峡谷地貌,年降雨量大,地质环境条件脆弱。研究区西溪河北岸多发育高位高危碎屑流型滑坡,具有隐蔽性强、危害性大等特点。论文在Lidar影像分析、野外详查、钻探等手段的基础上,详细分析了滑坡地质环境背景、滑坡的特点及运动堆积过程,认为风化层厚度大、高陡的地形地貌、特殊的构造条件、典型的斜坡结构是滑坡发育的主要因素,持续性的降雨是滑坡发育的直接诱发因素,斜坡上部二叠系炭质灰岩、灰岩的崩落是导致斜坡中下部原本就处于孔隙水饱和状态下的志留系粉砂岩碎屑失稳并转化为碎屑流的重要因素。针对这类高位高危碎屑流型滑坡,提出了高位崩滑—高速启动—碰撞解体—高速铲刮—抛射堆积的成灾模式,为三峡库区此类滑坡的防治提供技术依据。更多还原

【Abstract】 Wuxi county is tectonically located at the core of the southern Daba Mountain arc-shaped folding belt and the northern edge of the octagonal mountain arc-shaped folding structure belt,and is geographically located in the north of the Fengjie-Wushan section of the Three Gorges Reservoir area,where the nearlyparallel folding structures mainly occur and the joints and cracks in the rocks are developed.The topography of the region is characterized by strong cutting and undulating features.It is of high and middle mountain canyon landform,large annual rainfall,and fragile geological environment conditions.In the study area,large rock landslides with high-location and high-risk clastic flow is mostly developed,which have the characteristics of strong concealment and great danger.On the basis of Lidar image analysis and detailed field survey,a detailed analysis of the characteristics of the landslide geology environment background,the characteristics of the landslide and the accumulation process are carried out in this paper.The results show that the weathering of big thickness,high and steep topography,the structure of the special conditions,typical slope structure are the main factors of landslide development.Continuous rainfall is a direct causative factor for the development of the landslide.The collapse of the Permian caving of the carbonaceous limestone and limestone in the upperpart of the slope is an important factor leading to the instability and transformation of the Silurian siltstone debris or residual overburden in the middle and lower parts of the slope into clastic flow.Aiming at this kind of high-risk debris flow landslide,this paper puts forward the disaster mode of high-location collapse sliding →high speed initiation → collision disintegration → high speed shovel scraping → projectile accumulation,which may provide a technical basis for prevention and treatment of this kind of landslide in the Three Gorges Reservoir area.更多还原