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Investigation on the Failure Mechanism of Rainfall-Induced Long-Runout Landslide at Upputhode, Kerala State of India

Author

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  • Rajkumar Andrewwinner

    (Department of Structural and Geotechnical Engineering, School of Civil Engineering, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India)

  • Sembulichampalayam Sennimalai Chandrasekaran

    (Centre for Disaster Mitigation and Management (CDMM), Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India)

Abstract

The main objective of the study is to estimate the shear resistance mobilized on the slope surface under large deformation and to identify the failure mechanism of the landslide through the simulation model. The field investigations were carried out using Geophysical tests, and the laboratory tests were conducted to identify the engineering properties of the soil with weathering characteristics of the parent rock. The residual shear strength parameters from Torsional ring shear tests were used in LS-RAPID numerical simulation software to study the mechanism of the landslide. The critical pore water pressure ratio (r u = 0.32) required for the initiation of a landslide was obtained. The increase in pore water pressure reduces the soil matric suction and thereby results in the reduction of the shear strength of the soil. The progressive failure mechanism and the three landslide processes (initiation, run out and deposition) are investigated. The velocity of the moving landslide mass in the role of demolishing the building is studied and helps in finding suitable remedial measures for the nearby building. The empirical rainfall threshold based on the antecedent rainfall was developed and revealed that either a high daily rainfall intensity of 142 mm without any antecedent rainfall, or an antecedent rainfall of 151 mm for a cumulative period of 5 days with even continuous normal rainfall can initiate landslide.

Suggested Citation

  • Rajkumar Andrewwinner & Sembulichampalayam Sennimalai Chandrasekaran, 2021. "Investigation on the Failure Mechanism of Rainfall-Induced Long-Runout Landslide at Upputhode, Kerala State of India," Land, MDPI, vol. 10(11), pages 1-25, November.
    • Handle: RePEc:gam:jlands:v:10:y:2021:i:11:p:1212-:d:674789
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    References listed on IDEAS

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    1. A. Sengupta & S. Gupta & K. Anbarasu, 2010. "Rainfall thresholds for the initiation of landslide at Lanta Khola in north Sikkim, India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 52(1), pages 31-42, January.
    2. Terry Jeggle & Marco Boggero, 2018. "Post-Disaster Needs Assessment," World Bank Publications - Reports 30945, The World Bank Group.
    3. K. Sajinkumar & R. Castedo & P. Sundarajan & V. Rani, 2015. "Study of a partially failed landslide and delineation of piping phenomena by vertical electrical sounding (VES) in the Wayanad Plateau, Kerala, India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 75(1), pages 755-778, January.
    4. K. Sajinkumar & S. Anbazhagan, 2015. "Geomorphic appraisal of landslides on the windward slope of Western Ghats, southern India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 75(1), pages 953-973, January.
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    1. Fabio Luino & Jerome De Graff & Marcella Biddoccu & Francesco Faccini & Michele Freppaz & Anna Roccati & Fabrizio Ungaro & Michele D’Amico & Laura Turconi, 2022. "The Role of Soil Type in Triggering Shallow Landslides in the Alps (Lombardy, Northern Italy)," Land, MDPI, vol. 11(8), pages 1-26, July.

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