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

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...

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Autores principales:	Rajkumar Andrewwinner, Sembulichampalayam Sennimalai Chandrasekaran
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	landslide rainfall geophysical test failure mechanism numerical simulation and thresholds Agriculture S
Acceso en línea:	https://doaj.org/article/0e6d59e1672f4e3191704c4c1231231d
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spelling	oai:doaj.org-article:0e6d59e1672f4e3191704c4c1231231d2021-11-25T18:09:42ZInvestigation on the Failure Mechanism of Rainfall-Induced Long-Runout Landslide at Upputhode, Kerala State of India10.3390/land101112122073-445Xhttps://doaj.org/article/0e6d59e1672f4e3191704c4c1231231d2021-11-01T00:00:00Zhttps://www.mdpi.com/2073-445X/10/11/1212https://doaj.org/toc/2073-445XThe 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<sub>u</sub> = 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.Rajkumar AndrewwinnerSembulichampalayam Sennimalai ChandrasekaranMDPI AGarticlelandsliderainfallgeophysical testfailure mechanismnumerical simulation and thresholdsAgricultureSENLand, Vol 10, Iss 1212, p 1212 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	landslide rainfall geophysical test failure mechanism numerical simulation and thresholds Agriculture S
spellingShingle	landslide rainfall geophysical test failure mechanism numerical simulation and thresholds Agriculture S Rajkumar Andrewwinner Sembulichampalayam Sennimalai Chandrasekaran Investigation on the Failure Mechanism of Rainfall-Induced Long-Runout Landslide at Upputhode, Kerala State of India
description	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<sub>u</sub> = 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.
format	article
author	Rajkumar Andrewwinner Sembulichampalayam Sennimalai Chandrasekaran
author_facet	Rajkumar Andrewwinner Sembulichampalayam Sennimalai Chandrasekaran
author_sort	Rajkumar Andrewwinner
title	Investigation on the Failure Mechanism of Rainfall-Induced Long-Runout Landslide at Upputhode, Kerala State of India
title_short	Investigation on the Failure Mechanism of Rainfall-Induced Long-Runout Landslide at Upputhode, Kerala State of India
title_full	Investigation on the Failure Mechanism of Rainfall-Induced Long-Runout Landslide at Upputhode, Kerala State of India
title_fullStr	Investigation on the Failure Mechanism of Rainfall-Induced Long-Runout Landslide at Upputhode, Kerala State of India
title_full_unstemmed	Investigation on the Failure Mechanism of Rainfall-Induced Long-Runout Landslide at Upputhode, Kerala State of India
title_sort	investigation on the failure mechanism of rainfall-induced long-runout landslide at upputhode, kerala state of india
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/0e6d59e1672f4e3191704c4c1231231d
work_keys_str_mv	AT rajkumarandrewwinner investigationonthefailuremechanismofrainfallinducedlongrunoutlandslideatupputhodekeralastateofindia AT sembulichampalayamsennimalaichandrasekaran investigationonthefailuremechanismofrainfallinducedlongrunoutlandslideatupputhodekeralastateofindia
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Investigation on the Failure Mechanism of Rainfall-Induced Long-Runout Landslide at Upputhode, Kerala State of India

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