Landslide hazard identification based on slope unit: A case study of shallow soil slope in Wanshan, Guizhou Province

Fengchai ZOU; Yangyang LENG; Xiaolang TAO; Songbiao HE

doi:10.16031/j.cnki.issn.1003-8035.2022.03-13

Volume 33 Issue 3

Jun. 2022

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The Chinese Journal of Geological Hazard and Control > 2022 > 33(3): 114-122. > DOI: 10.16031/j.cnki.issn.1003-8035.2022.03-13

ZOU Fengchai, LENG Yangyang, TAO Xiaolang, et al. Landslide hazard identification based on slope unit: A case study of shallow soil slope in Wanshan, Guizhou Province[J]. The Chinese Journal of Geological Hazard and Control, 2022, 33(3): 114-122. DOI: 10.16031/j.cnki.issn.1003-8035.2022.03-13

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Landslide hazard identification based on slope unit: A case study of shallow soil slope in Wanshan, Guizhou Province

1.
Guizhou Institute of Geo-Environment Monitoring, Guiyang, Guizhou　550081, China
2.
College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu, Sichuan　610059, China

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Received Date: February 24, 2022
Revised Date: May 09, 2022
Accepted Date: May 10, 2022
Available Online: May 24, 2022

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Abstract

Abstract

The identification of slope geological disaster risk has become an important basic work for geological disaster prevention and control in southwest mountainous areas. The potential unstable slope units are divided by GIS program, and six factors including dip angle, elevation, thickness of covering, slope soil type、human engineering activities and maximum rainfall were selected as evaluation factors. Analytic hierarchy process (AHP) is carried out to assess risk of large-scale geological hazards in mountainous areas and preliminarily evaluate the unstable slopes in the study area. While taking slope models in study area of Wanshan as examples, the safety factors under heavy rain condition are analyzed with FEM approaches. In this method, we only reduce the strength parameters of elements whose shear strain is beyond the limit value．The reduction process will continue until the global slope failure associated with the formation of whole sliding surface whose limit shear strains beyond the limit value．It is found that all of the safety factors in 12 slopes are below 1.05 which accorded with the results of AHP. It is proved that proposed method can be seen as a quantitative evaluation method for geological hazard identification of the soil unstable slope in southwest mountainous area.
- slope unit,
- analytic hierarchy process,
- strength reduction method,
- risk of landslide,
- identification

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Landslide hazard identification based on slope unit: A case study of shallow soil slope in Wanshan, Guizhou Province

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