Volume 26 Issue 4
Aug.  2020
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Article Navigation >  Journal of Geomechanics  > 2020  >  26(4): 481-491
YAN Jinkai, HUANG Junbao, LI Hailong, et al., 2020. Study on instability mechanism of shallow landslide caused by typhoon and heavy rain. Journal of Geomechanics, 26 (4): 481-491. DOI: 10.12090/j.issn.1006-6616.2020.26.04.041
Citation: YAN Jinkai, HUANG Junbao, LI Hailong, et al., 2020. Study on instability mechanism of shallow landslide caused by typhoon and heavy rain. Journal of Geomechanics, 26 (4): 481-491. DOI: 10.12090/j.issn.1006-6616.2020.26.04.041
shu

Study on instability mechanism of shallow landslide caused by typhoon and heavy rain

doi: 10.12090/j.issn.1006-6616.2020.26.04.041
  • 1.

    Chinese Academy of Geological Science, Beijing 100037, China

  • 2.

    Fujian Center of Geo-Environmental Monitoring, Fuzhou 350001, Fujian, China

  • 3.

    China Institute of Geo-Environmental Monitoring, Beijing 100081, China

More Information
  • Received: 2020-05-31
  • Revised: 2020-06-30
  • Published: 2020-08-01
    Abstract
  • The instability mechanism of shallow landslide under the coupling of typhoon and heavy rain is studied. On the basis of summarizing the disaster characteristics of landslides caused by typhoon and heavy rain in Fujian, it is proposed that the influence mechanism of wind load on slope deformation and instability is that the slope body is cracked by vegetation, which affects the slope infiltration law. GeoStudio software was used to calculate the changes of transient unsaturated seepage field in the cracked slope body under the condition of typhoon storm infiltration, and to study the effect on the slope stability. The calculation results show that, due to the formation of concentrated infiltration points at the cracks, the infiltration rate of rainwater is greater than that of the unslitted slopes, and the time required for the slopes to reach saturation is greatly shortened. The depth and spacing of cracks have a greater impact on the stability coefficient of landslides. The greater the depth of cracks and the smaller the spacing, the smaller the stability coefficient of the landslide under the same rainfall conditions, and the shorter the rainfall duration required for landslide instability. The effect of crack width on landslide stability is relatively small.

     

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