Journal of Jilin University(Earth Science Edition) ›› 2022, Vol. 52 ›› Issue (2): 503-516.doi: 10.13278/j.cnki.jjuese.20200180

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Deformation and Instability Mechanism of Landslide Accumulation: A Case Study of Donglingxin Landslide Accumulation in Jianhe County, Guizhou Province

Tang Junfeng1, Tang Xuemei1, Zhou Ji1, Zhong Huiya2, Xie Shangzhi3   

  1. 1. School of Civil and Environmental Engineering, Hunan University of Science and Engineering, Yongzhou 425199, Hunan，China 
    2. PowerChina Zhongnan Engineering Corporation Limited，Changsha 410014，China 
    3. Hunan Hua’an Foundation Engineering Corporation Limited，Changsha 410000，China
  • Received:2020-06-05 Online:2022-03-27 Published:2022-11-22
  • Supported by:
    the Natural Science Foundation of Hunan Province (2020JJ4326) and the Independent Innovation Project of PowerChina Zhongnan Engineering Corporation Limited (YFHT-1856)

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Abstract: In order to study the deformation mechanism of landslide accumulation and  treat it more effectively, taking Donglingxin landslide accumulation in Jianhe county, Guizhou as an example, the geological conditions of Donglingxin landslide accumulation  were  investigated  based on the detailed geological exploration, indoor test and drainage tunnel construction， the surface displacement, surface fracture, in-hole fracture, and deep displacement were comprehensively analyzed, and the deformation characteristics of landslide accumulation   were discussed. Finally, the stability of the slope  was evaluated by numerical method. The results show that the initial storage of the reservoir starts the deformation and instability process of Donglingxin landslide accumulation, and then，the slope enters into the creep deformation stage. The rise of river water level and continuous heavy rainfall lead to the rise of the groundwater level of the slope, which results in a step development of the slope deformation curve . The slope safety factor reaches the highest value (1.14) in the pre-flood dry season and the lowest value (1.01) at the end of the flood season. Main attention should be paid to lower the slope groundwater table by drainage measures.

Key words: landslide accumulation, underground water table, deformation mechanism, stability of the slope

CLC Number: 

  • P642.22
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