Deformation Mechanism of Huangnibadengkan Landslide in Three Gorges Reservoir Area

YI Qinglin; ZHAO Nenghao

doi:10.13961/j.cnki.stbctb.2016.02.009

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Deformation Mechanism of Huangnibadengkan Landslide in Three Gorges Reservoir Area

- Deformation Mechanism of Huangnibadengkan Landslide in Three Gorges Reservoir Area
- Bulletin of Soiland Water Conservation Vol. 36, Issue 2, Pages: 42-47(2016)
- 作者机构：
  
  1. 三峡地区地质灾害与生态环境湖北省协同创新中心,湖北,宜昌,443002
  2. 三峡大学三峡库区地质灾害教育部重点实验室,湖北,宜昌,443002
  3. 三峡大学湖北长江三峡滑坡国家野外科学观测研究站,湖北,宜昌,443002
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2016.02.009
  CLC：
- Published：2016
- 稿件说明：
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YI Qinglin, ZHAO Nenghao. Deformation Mechanism of Huangnibadengkan Landslide in Three Gorges Reservoir Area[J]. Bulletin of Soiland Water Conservation, 2016, 36(2): 42-47.
DOI：

YI Qinglin, ZHAO Nenghao. Deformation Mechanism of Huangnibadengkan Landslide in Three Gorges Reservoir Area[J]. Bulletin of Soiland Water Conservation, 2016, 36(2): 42-47. DOI： 10.13961/j.cnki.stbctb.2016.02.009.

摘要

[目的] 研究黄泥巴蹬坎滑坡的变形规律及失稳机制

旨在为库区同类型滑坡的研究提供借鉴。[方法] 分析该滑坡的宏观变形特征

结合专业监测数据

研究其变形规律及失稳机制

并运用数值模拟计算研究库水位下降的致滑机理。[结果] 黄泥巴蹬坎Ⅰ号滑体变形严重

分别于2007年4-6月

2009年4-6月

2012年4-6月发生加速变形

且加速变形速率逐次呈快速增长趋势。库水位下降对该滑坡稳定性的影响表现为坡体外部卸荷效应和内部动水压力推动作用。一方面

库水位下降使得指向坡内的静水压力消失

导致抗滑力减小。另一方面

库水位下降引起坡内地下水位下降

地下水沿滑带方向渗流

产生的动水压力推动滑坡向外发生变形。[结论] 目前黄泥巴蹬坎滑坡处于欠稳定状态

库水位下降加之连续强降雨是导致黄泥巴蹬坎滑坡变形失稳的主要因素。

Abstract

[Objective] Studying the deformation rule and failure mechanism of Huangnibadengkan slope in order to achieve accurate prediction of landslide and provide reference for similar type of landslides research. [Methods] Through the analysis of its macroscopic deformation characteristics and based on professional monitoring data

the deformation rule and failure mechanism of this slope was studied. Meanwhile

slide mechanism mainly caused by water level falling is analyzed using the numerical calculation. [Results] Serious deformation happened in slide mass Ⅰ of Huangnibadengkan slope

which experienced accelerating deformation for three times

occurred in April to June in 2007

2009 and 2012

respectively. The effects that reservoir water drawdown makes on this landslide are considered as two aspects: unloading on slope surface and internal hydrodynamic pressure. That means

on one hand

the horizontally slope-inward hydrostatic pressure disappears

as a result

the resistance force will decrease; on another hand

the underground water level drops triggered by reservoir water drawdown

will result in outward deformation of the landslide pushed byhydrodynamic pressure. [Conclusion] The Huangnibadengkan landslide is in an unstable state at present

and falling of reservoir water level and continuous heavy rain are proved to be the main factors that lead to the deformation of this landslide.

关键词

Keywords

references

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