Finite Element and Reliability Analyses for Slope Stability of Subansiri Lower Hydroelectric Project: A Case Study

Rathod, Ganesh W.; Rao, K. Seshagiri

doi:10.1007/s10706-011-9465-2

Cited by 16 publications

(6 citation statements)

References 20 publications

(21 reference statements)

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“…Typically, numerical simulations are used to study such complexity, making it possible to take into account all governing factors. Numerous instances of the successful use of numerical tools to study the behavior of the slope have been documented (Pal et al 2012, Rathod andRao 2012). Three methods exist to perform 3D slope stability analyses: the Finite Element Method, the Limit Analysis Method, and the Limit Equilibrium Method.…”

Section: Introductionmentioning

confidence: 99%

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Static and seismic stability investigation of a bamboo grid reinforced slope with different stepped reinforcing arrangements

Samal,

Sahoo,

Badavath

2024

Eng. Res. Express

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Bamboo is primarily used as a soil reinforcement material to build roadways and stabilize slopes and river banks. The current study aims to examine how bamboo grid reinforcing slopes behave in the form of various stepped reinforcing arrangements. The static and seismic characteristics of a slope reinforced with a bamboo grid were examined through 3D numerical analyses employing the finite element program MIDAS GTS NX (340) 2023 v1.1. In this study, the Strength Reduction Method (SRM), a crucial technique in finite element analysis, is utilized to compute the factor of safety and displacement in static stability analysis. Seismic stability analysis is conducted using non-linear time history analysis, examining the changes in critical slope parameters in response to seismic excitation.Three distinct arrangements of bamboo grids were employed to enhance slope stability. Static stability analysis, considering the factor of safety and deformation, was conducted for various bamboo grid-reinforced slope arrangements. Additionally, a comprehensive seismic analysis was performed specifically for the type 2 bamboo grid reinforcement arrangement, using the seismic record from the 1971 San Fernando Down earthquake. The safety factor increases by 52.10%, 68.67%, and 62.65% for type 1, 2, and 3 arrangements, respectively, compared to the unreinforced slope. Consequently, the type 2 bamboo grid-reinforced slope arrangement exhibits superior stability in terms of the safety factor. The lateral displacement of the type 2 arrangement is minimal compared to other types. Furthermore, a bamboo grid-reinforced slope with a vertical spacing of 1.5 m demonstrates less deformation than slopes with different vertical spacings. The seismic stability of the slope body surpasses other sections of the bamboo grid-reinforced slope.

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Section: Introductionmentioning

confidence: 99%

“…However, it was discovered that the vulnerability increased significantly in wet conditions. Rathod and Rao (2012) gave a comprehensive numerical analysis of the slopes' failure in the lower Subanshiri hydroelectric generating project. For roadcutting slopes, Singh et al (2008) were observed doing comparable work in the Uttarakhand region.…”

Section: Introductionmentioning

confidence: 99%

Static and seismic stability investigation of a bamboo grid reinforced slope with different stepped reinforcing arrangements

Samal,

Sahoo,

Badavath

2024

Eng. Res. Express

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“…Landslide characterisation is described through various means, e.g. landslide mechanisms and occurrence force (Leroueil 2001;Take et al 2004;Huang et al 2022), failure mode analysis/simulation (Liu et al 2015;Sidle and Bogaard 2016;Han et al 2019a), sensitivity/reliability analysis (Rathod and Rao 2012;Nguyen and Likitlersuang 2019;Huang et al 2020), and the design of effective countermeasure and their field optimisation (Popescu and Sasahara 2009;Han et al 2019b;Chen et al 2021). In addition to the physical science investigation, socio-economic analysis of the landslide issues helps to infer the vulnerability of the people living on dangerous slopes and effectively promotes the disaster risk governance (Antronico et al 2020;Vij et al 2020;Alam and Ray-Bennett 2021;Huang et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Assessing the effectiveness of landslide slope stability by analysing structural mitigation measures and community risk perception

et al. 2023

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Rainfall-induced landslides seriously threaten hilly environments, leading local authorities to implement various mitigation measures to decrease disaster risk. However, there is a significant gap in the current literature regarding evaluating their effectiveness and the associated community risk perception. To address this gap, we used an interdisciplinary and innovative approach to analyse the slope stability of landslides, evaluate the effectiveness of existing structural mitigation measures, and assess the risk perception of those living in danger zones. Our case study focused on the Kutupalong Rohingya Camp (KRC) in Cox’s Bazar, Bangladesh, which is home to over one million Rohingya refugees from Myanmar. Although various structural and non-structural countermeasures were implemented in the KRC to mitigate the impact of landslides, many of them failed to prevent landslides from occurring. We utilised a variety of methods from the physical sciences, including the infinite slope, limit equilibrium (LEM), and finite element (FEM) approaches, to calculate the factor of safety (FoS) for specific slopes. Additionally, in the social sciences domain, we conducted a questionnaire survey of approximately 400 Rohingya participants to assess the community’s perception of the interventions and the degree of disaster risk. Our findings indicated that slopes with a gradient greater than 40° were unstable (FoS < 1), which was present throughout the entire KRC area. The effectiveness of the LEM and FEM methods was evaluated for four dominant slope angles (40°, 45°, 50°, and 55°) under varying loads (0, 50, and 100 kN/m2). The slopes were found to be stable for lower slope angles but unstable for higher slope angles (> 50°) and increased overburden loads (50–100 kN/m2). Different mitigation measures were tested on the identified unstable slopes to assess their effectiveness, but the results showed that the countermeasures only provided marginal protection against landslides. Survey results revealed that at least 70% of respondents believed that concrete retaining walls are more effective in reducing landslide occurrence compared to other measures. Additionally, about 60% of the respondents questioned the reliability of the existing structural mitigation measures. The study also found that the cohesion and friction angle of lower sandstone and the cohesion of upper soil layers are important factors to consider when designing and implementing slope protection countermeasures in the KRC area.

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“…In addition to the time-dependent deformation characteristics of rock and soil, the deformation of slope is also affected by excavation disturbance, reservoir water and rainfall during construction. G. W. Rathod and K. S. Rao [3] discussed the stability of rock slope of India Subansiri Lower hydropower station based on limit equilibrium and finite element analysis. H. J.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Deformation Velocity and Stress Field of Rock Mass During Construction of Power System Engineering

Zhang,

Jin,

Lin

et al. 2023

Advances in Transdisciplinary Engineering

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Based on the comprehensive analysis of the basic parameters of the reservoir dam, the engineering hydrogeological conditions and the internal relationship between the time and space deformation of the valley and the reservoir dam after impoundment, a three-dimensional model of about 500 m on the left and right banks of transverse river direction is established for dynamic simulation. The deformation and stress evolution of the high slopes of rock and soil on both sides of the dam area of a large power project are simulated by using finite element method and finite difference method, and the development law of deformation, stress distribution and the change characteristics of internal unbalanced force are analyzed, as well as the deformation speed of the high slopes on both sides of the river in the direction of facing the airport and the speed of valley deformation. The research results can provide reference for the stress distribution, valley deformation law and safety monitoring of rock mass on both banks in design and research of dam engineering.

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Finite Element and Reliability Analyses for Slope Stability of Subansiri Lower Hydroelectric Project: A Case Study

Cited by 16 publications

References 20 publications

Static and seismic stability investigation of a bamboo grid reinforced slope with different stepped reinforcing arrangements

Static and seismic stability investigation of a bamboo grid reinforced slope with different stepped reinforcing arrangements

Assessing the effectiveness of landslide slope stability by analysing structural mitigation measures and community risk perception

Analysis of Deformation Velocity and Stress Field of Rock Mass During Construction of Power System Engineering

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