Geotechnical characterization and analysis of rainfall—induced 2009 landslide at Marappalam area of Nilgiris district, Tamil Nadu state, India

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

doi:10.1007/s10346-017-0839-2

Cited by 28 publications

(9 citation statements)

References 25 publications

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“…The soil of an area classified with low landslide predisposition regarding geo-environmental conditions can hide some characteristics that situate it at the stability limit or out. These characteristics can include tension cracking, spring lines mostly due to high swelling, and shrinkage capacities, as previously stated by [ 3 , 4 , 5 , 6 , 9 ].…”

Section: Resultsmentioning

confidence: 90%

“…A landslide is a complex geological process of denudation-erosion, which involves the displacement of soil or rock along a slope under the influence of gravity [ 1 , 2 ]. However, the study of rock and soil characteristics, faults, lineaments, and seismic events allows detecting warning signs, including small displacements of parts of the slope, tension cracking, and reactivation of spring lines [ 3 , 4 , 5 , 6 ]. Furthermore, soil geomechanical properties, such as water content, porosity, grain sizes, plasticity index, methylene blue value (MBV), soil angle of internal friction, and cohesion, can play a significant role when trying to understand and predict slope soil failure mechanisms [ 3 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Soil Geomechanical Properties and Geo-Environmental Factors on Landslide Predisposition at Mount Oku, Cameroon

Djukem

Braun

Wouatong

et al. 2020

IJERPH

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In this work, we explored a novel approach to integrate both geo-environmental and soil geomechanical parameters in a landslide susceptibility model. A total of 179 shallow to deep landslides were identified using Google Earth images and field observations. Moreover, soil geomechanical properties of 11 representative soil samples were analyzed. The relationship between soil properties was evaluated using the Pearson correlation coefficient and geotechnical diagrams. Membership values were assigned to each soil property class, using the fuzzy membership method. The information value method allowed computing the weight value of geo-environmental factor classes. From the soil geomechanical membership values and the geo-environmental factor weights, three landslide predisposition models were produced, two separate models and one combined model. The results of the soil testing allowed classifying the soils in the study area as highly plastic clays, with high water content, swelling, and shrinkage potential. Some geo-environmental factor classes revealed their landslide prediction ability by displaying high weight values. While the model with only soil properties tended to underrate unstable and stable areas, the model combining soil properties and geo-environmental factors allowed a more precise identification of stability conditions. The geo-environmental factors model and the model combining geo-environmental factors and soil properties displayed predictive powers of 80 and 93%, respectively. It can be concluded that the spatial analysis of soil geomechanical properties can play a major role in the detection of landslide prone areas, which is of great interest for site selection and planning with respect to sustainable development at Mount Oku.

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Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Effect of Soil Geomechanical Properties and Geo-Environmental Factors on Landslide Predisposition at Mount Oku, Cameroon

Djukem

Braun

Wouatong

et al. 2020

IJERPH

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show abstract

“…Equations (1) and (16) can be used to calculate the anti-shear stress value of a certain position in the sliding zone. Creep slip displacement of sliding zone soil was assumed to be linearly distributed from the back edge to the front edge.…”

Section: Stability Calculation Of Sliding Zone Soil Of Thrust-load-inmentioning

confidence: 99%

“…Regarding the formation mechanism of such landslides and considering the abovementioned characteristics of accumulation landslides, the current research focus is on the water-soil interaction mechanism after rainfall infiltration: (1) Water-soil mechanical reactions in the accumulation body caused by rainfall infiltration are mainly characterized by changes in hydrostatic and hydrodynamic pressure due to saturated seepage [9][10][11][12][13][14][15][16][17] and matric suction changes due to unsaturated seepage [18][19][20][21][22][23]. The changes in hydrostatic pressure are reflected by increases in pore water pressure in the rock-soil mass, which reduce the effective stress and shear strength on the potential sliding surface.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Weakening Law and Stability of Sliding Zone Soil in Thrust-Load-Induced Accumulation Landslides Triggered by Rainfall Infiltration

Zhou

Shen

Tang

et al. 2021

Water

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This study investigated the weakening model, law of mechanics parameters, and stability of the sliding zone soil associated with thrust-load-induced accumulation landslides triggered by rainfall infiltration. The spatial and morphological characteristics and rule of the sapping process were analyzed, considering the constitutive equation of the sliding zone soil, in order to establish a state curve equation for the weakening coefficient of sliding zone soil based on the “S”-shaped curve. Moreover, a formula for calculating slope stability with this failure mode was derived and applied to calculate the stability of a deformation body in Danbo reservoir, China. The results show that the sliding zone in this type of landslide exhibits steep upward and slow downward trends, and affected by rainfall infiltration, its failure develops gradually from the trailing edge to the front edge. In the constitutive equation, the weakening of soil mechanical parameters is manifested as the weakening of shear stiffness, while the “S”-shaped curve of the weakening coefficient reflects the spatial characteristics of the weakening process. The main factors affecting the accuracy of the slope stability calculation are the values of model parameters and assessment of the development characteristics and weakening stage of the sliding zone.

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“…Landslides induced by rainfall, posing a great threat to lives and infrastructures in mountain areas, have received increased attention in recent decades [1][2][3][4][5][6][7][8]. Thus, quantifying the triggering rainfall thresholds in a region will be of great importance in risk assessments and early warning of landslide hazards.…”

Section: Introductionmentioning

confidence: 99%

Rainfall thresholds of shallow landslides in Wuyuan County of Jiangxi Province, China

et al. 2020

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Rainfall is a critical factor inducing landslides, and thus the study of rainfall thresholds is of great significance for the prediction and prevention of landslides. In June 2017, infrastructures such as electric power pylons and roads were threatened by group-occurring landslides due to continuous heavy rainfall in Wuyuan County, Jiangxi Province of China. Based on the analysis of the rainfall data from March to September in this region, the lower (92.4 mm/d) and the upper (217.1 mm/d) empirical rainfall thresholds were determined. The soil water characteristic parameters of a typical landslide were determined by laboratory tests and back-analysis. Then, the factor of safety (FOS) versus time and the mechanical response of failure process with rainfall infiltration were examined. The results showed that during rainfall infiltration, the pore-water pressure increased, while the matrix suction and the stability decreased gradually. After the rain, the FOS increased slowly to a constant value, which was smaller than the initial. The physical rainfall threshold (200 mm/d), determined using 18 numerical simulation tests considering different rainfall intensities and amounts, was consistent with the empirical rainfall threshold. The methods developed in this work provide a useful tool for the prediction of landslides under extreme rainfall conditions.

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Geotechnical characterization and analysis of rainfall—induced 2009 landslide at Marappalam area of Nilgiris district, Tamil Nadu state, India

Cited by 28 publications

References 25 publications

Effect of Soil Geomechanical Properties and Geo-Environmental Factors on Landslide Predisposition at Mount Oku, Cameroon

Effect of Soil Geomechanical Properties and Geo-Environmental Factors on Landslide Predisposition at Mount Oku, Cameroon

Analysis of Weakening Law and Stability of Sliding Zone Soil in Thrust-Load-Induced Accumulation Landslides Triggered by Rainfall Infiltration

Rainfall thresholds of shallow landslides in Wuyuan County of Jiangxi Province, China

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