Abstract
On 28th July 2018, a massive landslide occurred in a mountainous area in Northern Thailand. The landslide after ten days of heavy rainfall generated the movement of uphill mountain soil into the populated village. This study presents a comprehensive failure analysis of local rainfall-induced landslides based on topographical and geological information. Rainfall measurement data were gathered from two rainfall stations close to the study area. The rainfall records show that the total monthly rainfalls in 2018 were significantly higher than the average monthly rainfalls over the past decade. Site investigation started with an unmanned aerial photogrammetric survey to generate a digital elevation model. Then, dynamic probing test, microtremor survey, and electrical resistivity survey were carried out along undisturbed soils beside the failed slope to evaluate the thickness of the soft soil cover on top of the rock basement. During the site survey, residual soil samples were collected to determine engineering properties in the laboratory. Finally, a slope stability analysis was performed to assess the landslide hazard based on the results of aerial photogrammetric survey, field exploration, and laboratory tests. The slope stability analysis and rainfall records revealed that the Huay Khab landslide was mainly caused by an increase in the water content of residual soils due to the prolonged rainfall which led to a sharp decrease in the shear strength. This leads to the conclusion that the proposed landslide investigation program could be used to assess the potential of landslide failure due to prolonged rainfall on a local scale.
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Acknowledgement
This research was supported by National Research Council of Thailand (NRCT): NRCT5-RSA63001-05 and the Ratchadapisek Sompoch Endowment Fund (2021), Chulalongkorn University (764002-ENV). The first author (V. KOMOLVILAS) acknowledges Grants for Development of New Faculty Staff, Ratchadaphiseksomphot Endowment Fund, Chulalongkorn University, Thailand. The second author (W. TANAPALUNGKORN) acknowledges the C2F Fund for Postdoctoral Fellowship, Chulalongkorn University, Thailand. Authors would like to thank Professor Takashi Kyoya from Tohoku University for providing supporting numerical code. Special thanks to Miss Kamonrat Ngamcharoen and Mr. Kittikhun Kounyou for their help in collecting data during field trips.
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Komolvilas, V., Tanapalungkorn, W., Latcharote, P. et al. Failure analysis on a heavy rainfall-induced landslide in Huay Khab Mountain in Northern Thailand. J. Mt. Sci. 18, 2580–2596 (2021). https://doi.org/10.1007/s11629-021-6720-8
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DOI: https://doi.org/10.1007/s11629-021-6720-8