金沙江永善—水富段滑坡分布规律及其形成模式

发布时间：2019-05-28 09:36

【摘要】：为了评估金沙江向家坝水库(永善—水富)蓄水后岸坡稳定性,同时为水库运营期地质灾害监测预警提供参考资料,以地质图、地形图、正射航空影像和SPOT-5商用卫星影像为基础资料,利用GIS平台,结合蓄水前现场调查和遥感解译方法建立滑坡数据库,利用统计学方法分析滑坡空间分布与岸坡结构、地层的关系,最后归纳了滑坡的四种形成模式。获得以下结果:(1)滑坡主要发育于新市镇以下侏罗系地层,新市镇以上滑坡分布受s0子坝断层控制;(2)缓倾外顺向层状岸坡(Ⅲ1)滑坡数量分布密度最大,斜向层状岸坡(Ⅴ)滑坡数量分布密度最小;(3)侏罗系自流井组(J2z)的滑坡点密度最大,二叠系乐平组(P2l)的滑坡面密度最大;(4)库区已有滑坡形成模式可归纳为四种:(1)倾坡外层状岩体岸坡(Ⅲ2)的切层滑动;(2)缓倾坡外层状岩体岸坡(Ⅲ1)的顺层滑动;(3)缓倾坡内层状岩体岸坡(Ⅳ1)的弧形滑动;(4)崩坡积、冲积松散层顺下伏基覆界面滑动。在向家坝水库蓄水期及运营期,应重点监测新市镇以下岸坡,尤其是缓倾外顺向层状岸坡(Ⅲ1)。
[Abstract]:In order to evaluate the stability of bank slope of Xiangjiaba Reservoir (Yongshan-Shuifu) in Jinsha River after impoundment, and to provide reference materials for monitoring and early warning of geological hazards during reservoir operation, geological maps and topographic maps are used. Based on ortho aerial image and SPOT-5 commercial satellite image, the landslide database is established by using GIS platform, combined with field investigation before water storage and remote sensing interpretation method, and the spatial distribution and bank slope structure of landslide are analyzed by statistical method. Finally, four formation modes of landslide are summarized. The following results are obtained: (1) the landslide is mainly developed in the Jurassic strata below the new town, and the distribution of the landslide above the new town is controlled by the S0Ziba fault; (2) the number distribution density of slope (III 1) is the largest, and that of slope (V) is the smallest. (3) the landslide point density of Jurassic self-flow well formation (J2z) is the highest, and that of Permian Leping formation (P2l) is the highest. (4) the existing landslide formation models in the reservoir area can be summarized into four types: (1) the sloping slope of the outer rock mass (III 2), (2) the bedding sliding of the bank slope of the outer rock mass of the gently inclined slope (III 1), and (2) the bedding sliding of the bank slope (III 1) of the outer rock mass of the inclined slope. (3) Arc sliding of layered rock mass bank slope (IV 1) in gently inclined slope, (4) collapse slope product, alluvial loose layer sliding along the interface of volt foundation cover. During the impoundment period and operation period of Xiangjioba Reservoir, the bank slope below the new town, especially the gentle outward forward layered bank slope (III 1), should be monitored.
【作者单位】：安徽理工大学土木建筑学院;四川大学水利水电学院水力学与山区河流开发保护国家重点实验室;
【基金】：国家自然科学基金国际合作项目(41661134012) 安徽理工大学博硕士基金(11678)
【分类号】：P642.22

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