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2023 Vol. 34, No. 4
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Article navigation > The Chinese Journal of Geological Hazard and Control > 2023 > 34(4): 30-38
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BEN Yanqi, YI Wu, LI Huabing, HUANG Xiaohu, LIU Wei, XIAO Yuhuang. Preliminary analysis on rainfall thresholds for early warning of the rainfall induced landslides based on “step” deformation characteristics[J]. The Chinese Journal of Geological Hazard and Control, 2023, 34(4): 30-38. doi: 10.16031/j.cnki.issn.1003-8035.202208008
Citation: BEN Yanqi, YI Wu, LI Huabing, HUANG Xiaohu, LIU Wei, XIAO Yuhuang. Preliminary analysis on rainfall thresholds for early warning of the rainfall induced landslides based on “step” deformation characteristics[J]. The Chinese Journal of Geological Hazard and Control, 2023, 34(4): 30-38. doi: 10.16031/j.cnki.issn.1003-8035.202208008
shu

Preliminary analysis on rainfall thresholds for early warning of the rainfall induced landslides based on “step” deformation characteristics

  • 1.

    National Field Observation and Research Station of Landslide in Three Gorges Reservoir Area of Yangtze River, Yichang, Hubei　443002, China

  • 2.

    Shiyan Natural Resources and Planning Bureau Geological Exploration and Disaster Prevention Section （Geological Disaster Prevention and Control Center）, Shiyan, Hubei　442000, China

  • 3.

    Hubei Provincial Geological Environment Station, Wuhan, Hubei　430034, China

More Information
Received Date:  03 August 2022
Revised Date:  08 November 2022
Publish Date:  25 August 2023
    Abstract

  • Since the occurrence of landslide disasters is random and complex, which often causes serious economic losses to people's lives and even threatens life safety, establishing landslide early warning criteria and models is an important means to reduce losses. In this paper, the effective rainfall-deformation rate-improved tangent angle is determined as the key criterion for the early warning of rainfall-type step landslide. Then, the slope single-variable point method is applied to determine the “damage inflection point” and “stability inflection point” on the landslide “step” deformation curve to extract detailed information of the deformation acceleration interval, so as to solve the effective The threshold value of rainfall-deformation rate-improved tangent angle integrated warning criterion. Finally, a 4-stage progressive integrated warning model was established by combining the macroscopic deformation characteristics of the landslide at each stage of development and the spatial and temporal evolution laws. The results show that the transport form of landslide No. 1 in Machi Village is traction type, and the cumulative displacement curve shows typical “step” deformation characteristics under the excitation of rainfall factors. The deformation of landslide No. 1 in Machi village is affected by the early rainfall, and the time interval threshold between the early rainfall and the current rainfall is 10 d, and the corresponding rainfall thresholds in the “early + current rainfall” mode are 24 mm and 32 mm respectively. The study can provide theoretical basis and technical guidance for early warning of this type of landslide hazard.

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