Rainfall-Induced Landslides: Case Study of the Marappalam Landslide, Nilgiris District, Tamil Nadu, India

Senthilkumar, V.; Chandrasekaran, S. S.; Maji, V. B.

doi:10.1061/(asce)gm.1943-5622.0001218

Cited by 41 publications

(14 citation statements)

References 35 publications

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“…Landslide. Numerous research studies indicated that shortterm heavy rainfall and long-term preceding rainfall are two important processes for shallow accumulation landslides [31][32][33][34]. Wieczorek [35] described that colluvium landslides induced by rainstorms with relatively low intensity (less than 10 mm/h) preceded by long antecedent rainfall.…”

Section: Failure Mechanism Of the G1002 Electricity Pylonmentioning

confidence: 99%

Failure Mechanism and Mitigation Measures of the G1002 Electricity Pylon Landslide at the Jinping I Hydropower Station

Luo

Zhong

Yang

2020

Advances in Civil Engineering

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On August 29 and 30, 2012, local extreme rainfalls struck the construction area of the Jinping I Hydropower Station, Xichang, China, and triggered many geohazards. The upper region of the left valley slope 200 m downstream of the dam failed and slid, exposing the D-pile of the G1002 electricity pylon and threatening the entire power transmission line. Therefore, guaranteeing the stability of the residual soil masses in the rear area of the main scarp and the safety of the G1002 electricity pylon became a primary emergency task. Geological field surveys, topographical mapping, study of the failure mechanisms, and stability evaluations were carried out from October 12, 2012, to November 7, 2013. It is revealed that the failure mechanism of the G1002 electricity pylon landslide is flood-induced tractive sliding along the interlayer between the colluvium and the bedrock, significantly influenced by heavy precipitation and frequent blasting activities during the dam construction. The residual soil masses around the G1002 electricity pylon foundation are unstable under rainfall conditions. In order to ensure the stability of the residual soil masses and pylon foundation, a mitigation measure of the anchor cables combined with lattice frame beams was proposed and applied in practice. This paper provides insights into the problems associated with the selection of the locations of electricity pylons in ravine regions as well as mitigation strategies for similar landslides.

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Section: Failure Mechanism Of the G1002 Electricity Pylonmentioning

confidence: 99%

Failure Mechanism and Mitigation Measures of the G1002 Electricity Pylon Landslide at the Jinping I Hydropower Station

Luo

Zhong

Yang

2020

Advances in Civil Engineering

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“…Looking back into history of rainfall-induced landslides in India, there are a number of cases out of which some catastrophic landslides are slope failure along Mandakini valley in Okhimath (1998), Malpa rockfall (1998), Agastyamuni (2005), Balia Nala landslide in Nainital (2014), Kedarnath (2013), Malin landslide (2014), Shillong (2019), Kalimpong (2015), Marapallam, Nilgiris (2009), etc. [2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Out of these methods, FEM and FDM give more accurate results as stress distributions and displacement of slope are also addressed in these methods which is not facilitated by LEM; but still LEM is the widely used method for slope stability analysis due to its simplicity and feasibility. Different software were used for analyzing slope stability which are transient rainfall infiltration and grid-based regional slope stability (TRIGRS), Geostudio (SEEP/W and SLOPE/W programs) [6, 11-13, 15-17, 19] Rock Science RS 2 [14,20], PLAXIS [21], FLAC (Fast Lagrangian Analysis of Continua) [5,7,9], etc. Out of all these software, SEEP/W and SLOPE/W programs of Geostudio 2018 R2 are used for seepage and slope stability analysis, respectively, as a transient rainfall infiltration analysis with corresponding factor of safety evaluation makes it easier to continuously analyze the slope stability from soil in unsaturated state to saturated state with its flexibility regarding geometry.…”

Section: Introductionmentioning

confidence: 99%

Rainfall Triggered Slope Instability Analysis with Changing Climate

2022

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Slope instability triggered by rainfall is common in tropical countries like India, where the soil of hill slopes are generally in unsaturated condition, having higher strength than in the saturated condition due to matric suction. This study aims to investigate the change in pore water pressure (PWP) with rainfall infiltration into the slope and the corresponding effect of the slope stability on different hill slopes from different regions of India. By applying rainfall on the surface of slope as a flux boundary condition, a transient seepage analysis is performed using SEEP/W, and the corresponding results in the form of PWP distribution within the slope are used as input for SLOPE/ W program of Geostudio 2018 R2, to check the stability of slope. This study involves the use of CMIP5 (Coupled model intercomparision project phase 5) simulations for rainfall data of different regions for the duration of 2015-2050, 2051-2075 and 2076-2100; which is completely based on non-stationary approach (i.e., the statistics of extremes changes with time) rather than the conventional methods of extracting rainfall data that are based on stationary approach. The stability of different slopes is checked for 95 percentile rainfall intensity as well as for maximum rainfall intensity for a period of 2015-2100, and the analysis is performed for 5 days for which the duration of rainfall is considered to be 24 h. It is concluded that due to climate change, slopes which may be marginally stable under historical and present rainfall events can fail under projected precipitation estimates, and this can be understood by the results of Haflong slope stability analysis as the 30°slope, which is marginally stable under maximum rainfall intensity for the period 2015-2050 having factor of safety (FOS) value 1.0013, will fail under the maximum rainfall intensity for the period 2051-2075 and 2076-2100 having FOS value 0.9935 and 0.9989, respectively. A continuous decrease in FOS with increasing rainfall intensity is observed for all the study areas under consideration.

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“…On the other hand, several methods such as the finite element method and finite difference method have been used for the coupled seepage-deformation analysis. For instance, Khan et al (2017) applied the finite element method in PLAXIS (Brinkgreve and Broere, 2010), while Senthilkumar et al (2018) used finite difference method in FLAC (Itasca, 2016). The ABAQUS (Dassault Systèmes, 2017), which is a general-purpose finite element modelling software, has been used in slope stability study as well.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of coupled seepage-deformation subjected to rainfall infiltration in unsaturated slope

Joe

Ali

Jusoh

2020

WJE

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Purpose This study aims to propose another alternative numerical modelling tool, i.e. ABAQUS, to simulate a fully coupled seepage-deformation analysis in unsaturated slope subjected to rainfall infiltration. Design/methodology/approach The effect of rainfall infiltration on the response of pore water pressure and factor of safety has been analysed and discussed. The results of this study have also been validated based on the results of field monitoring and previous numerical modelling. Findings The results from ABAQUS show a better agreement with those from field monitoring compared to other numerical modelling tools. Originality/value The procedures adopted in this study can be adopted and used as a guide to model similar slope problems in ABAQUS.

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Rainfall-Induced Landslides: Case Study of the Marappalam Landslide, Nilgiris District, Tamil Nadu, India

Cited by 41 publications

References 35 publications

Failure Mechanism and Mitigation Measures of the G1002 Electricity Pylon Landslide at the Jinping I Hydropower Station

Failure Mechanism and Mitigation Measures of the G1002 Electricity Pylon Landslide at the Jinping I Hydropower Station

Rainfall Triggered Slope Instability Analysis with Changing Climate

Numerical modelling of coupled seepage-deformation subjected to rainfall infiltration in unsaturated slope

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