三峡库区木鱼包滑坡变形特征及稳定性分析
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成都理工大学地质灾害防治与地质环境保护国家重点实验室

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P642.22

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大型水库蓄水运行期堆积层滑坡自组织自适应变形机理及变形预测模型(41977255)


Deformation characteristics and stability analysis of Muyubao landslide in Three Gorges Reservoir Area
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State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Sichuan Chengdu

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    摘要:

    木鱼包滑坡为三峡库区特大型古滑坡,长期以来持续变形,对三峡航道造成严重威胁。本文,通过对木鱼包滑坡近两年的自动GPS表面位移、深部位移、地下水位、降雨量监测对该滑坡的变形特征、变形机理进行研究,采用有限元软件模拟计算其一个完整水文周期内的稳定性变化特征。研究表明:(1)木鱼包滑坡中前部变形大于后部,变形主要发生在库水位上升及高水位运行期,在库水位快速下降阶段也有较大增加。(2)滑坡体前缘在159~175m之间的岩土体渗透系数较大,在159~145m之间的岩土体渗透系数相对较小。(3)库水位上升及高水位是影响滑坡变形的主要因素,库水位快速下降是滑坡变形的次要因素,而大气降雨对变形影响不明显,目前处于基本稳定状态。

    Abstract:

    The Muyubao landslide is an extremely large ancient landslide in the Three Gorges Reservoir area. It has been continuously deformed for a long time, which poses a serious threat to the navigation channel of the Three Gorges. In this paper, through the automatic GPS surface displacement, deep displacement, groundwater level and rainfall monitoring of Muyubao landslide in recent two years, the deformation characteristics and deformation mechanism of the landslide are studied, and the stability change characteristics in a complete hydrological cycle are calculated by using finite element software. The results show that: (1) the deformation of the front part of Muyubao landslide is larger than that of the back part of the landslide. The deformation mainly occurs in the period of reservoir water level rise and high water level operation, and also increases greatly in the stage of rapid decline of reservoir water level. (2) The permeability coefficient of rock and soil is larger when the front edge of landslide mass is between 159 and 175m, and the permeability coefficient of rock and soil mass between 159 and 145m is relatively small. (3) The rise of reservoir water level and high water level are the main factors affecting the deformation of landslide, and the rapid decline of reservoir water level is the secondary factor of landslide deformation, while the influence of atmospheric rainfall on deformation is not obvious, which is basically stable.

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向育才,汤明高,杨何,等. 三峡库区木鱼包滑坡变形特征及稳定性分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2020-12-08
  • 最后修改日期:2021-03-02
  • 录用日期:2021-04-01
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