Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (6): 1798-1807.doi: 10.13278/j.cnki.jjuese.201506203

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Main Factors Analysis for Controlling Kinematic Behavior of Suoertou Landslide

Jiang Xiuzi1, Wen Baoping1, Jiang Shu1, Feng Chuanhuang1, Zhao Cheng2, Li Ruidong2   

  1. 1. School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China;
    2. Gansu Institute of Geo-Enviroment Monitoring, Lanzhou 730050, China
  • Received:2015-01-26 Published:2015-11-26

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Abstract:

Suoertou landslide, an old giant landslide in Zhouqu County in Gansu Province, has been moving slowly since 1970's.The geological environment indicates that the slow-movement was controlled by behavior of slide's materials under four factors, including weight of the slope, activity of its boundary faults, incision of Bailongjiang river at its toe, and the groundwater within the slope; although only the slope weight has been confirmed for its importance. Based on the field investigation and monitoring data analysis, numerical simulation was adopted to analyze the contribution of the other three factors to the activity rate of the slide. It was found that the creep behavior of Suoertou landslide was mainly controlled by the groundwater and active fault in addition to its rheological nature, in which the effect of rise of water table was great than active fault on the dynamics of the slide. The numerical simulation results showed that Suoertou landslide's dynamic modes were similar with different velocity under different controlling factors. It was also found that when boundary faults were activated, the velocity of Suoertou landslide increased by 20%-47% compared to the condition of only gravity was considered; the landslide's velocity increased with the increasing of water table, the velocity increased by 20%-97% with 1 m rise of the water table. However, the incision of Bailongjiang river had only an influence on the velocity of the front part of the slide, and the amplitude of its velocity had no obvious positive relationship with the flow rate of Bailongjiang river.

Key words: Suoertou landslide, slow-moving landslide, groundwater, active fault, river incision

CLC Number: 

  • P642.22

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