Municipal Solid Waste Slope Stability Modeling: A Probabilistic Approach

Jahanfar, Ali; Gharabaghi, Bahram; McBean, Edward A.; Dubey, Brajesh

doi:10.1061/(asce)gt.1943-5606.0001704

Cited by 25 publications

(13 citation statements)

References 38 publications

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“…Jahanfar et al [4] stated that factors affecting the slope stability of the landfill are pore-water pressure, slope geometry, waste shear strength and disposal methods used during disposal operations. The landfill slope geometry changes when the wastes settle from time to time had a significant impact on the waste geotechnical properties and slope stability [5].…”

Section: Factors Affecting Landfill Slope Stabilitymentioning

confidence: 99%

Slope Stability of Landfill with Waste Degradation

Ismail¹,

Taib²,

Rahman³

et al. 2019

IJITEE

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Nowadays, a large amount of municipal solid waste (MSW) is generated due to the rapid urbanisation in developing countries leads to the demand for larger and higher capacity landfills. Bioreactor landfill technology has been introduced to accelerate the stability of landfill and to solve the issue of limited landfill area. However, the accelerated degradation of the refuse in bioreactor landfills also considerably changes the geotechnical characteristics of the waste in the landfill and thereby increases the concern for waste stability. Hence, this study aims to analyse the stability of both conventional and bioreactor landfill slope with the effects of waste degradation. Finite element method has been used in the slope stability analysis and the stability is presented by the factor of safety. The objectives of this study are i) to determine and assess the main parameter which influences the stability of the waste slope, ii) to determine the effects of waste degradation to the waste properties and iii) to obtain the factor of safety of the landfill slope using numerical analysis by finite element method. From the literature review, it is found that slope stability of a landfill mainly depends on the geotechnical properties of waste, such as moisture content, unit weight, shear strength parameters and hydraulic conductivity of waste. After the degradation process, engineering properties of field refuse are affected which includes the increased pore-water pressure and unit weight, decreased strength and lower hydraulic conductivity. Based on the analysis of conventional landfill slope stability by using Plaxis software, slope ratio of 1:3, 1:4 and 1:5 calculated safe with 1.69, 2.3 and 2.8 whereas the analysis of bioreactor landfill slope stability calculated safe only for slope ratio of 1:4 and 1:5 with 1.60 and 1.97. Moreover, the factor of safety for steeper slopes is lower and vice versa. From the parametric analysis, it is found that the full height of slope and unit weight of waste input affect the result analysis. This study is significant to evaluate the landfill slope stability with the effects of waste degradation and to ensure both conventional and bioreactor landfill slope stability for long periods.

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Section: Factors Affecting Landfill Slope Stabilitymentioning

confidence: 99%

Slope Stability of Landfill with Waste Degradation

Ismail¹,

Taib²,

Rahman³

et al. 2019

IJITEE

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show abstract

“…It is worth noting that due to the uncertainty of the geotechnical properties of the waste, there are difficulties and challenges in selecting the appropriate values for using in landfill design. These problems are due to the heterogeneity of the accumulated waste, the time-dependent behaviour, the problems related to the lack of standard sampling methods, and in situ and laboratory tests, and the strain incompatibility between the waste and its underlying materials (De Stefano et al, 2016; Fowmes et al, 2006; Gharabaghi et al, 2008; Jahanfar et al, 2017a). Indeed, MSW is a system of heterogeneous materials that, even when in a specific landfill, its phases and components are highly variable and exhibit variability in both vertical and horizontal directions.…”

Section: Introductionmentioning

confidence: 99%

“…They used the combination of the finite element numerical method and response surface metamodelling approach in their study. Jahanfar et al (2017a) present a novel probabilistic approach for slope stability analysis by back-calculation, assigning probability distributions to waste material properties. Reddy et al (2018) proposed a coupled hydro-bio-mechanical model to predict MSW behaviour in bioreactor landfills while simultaneously investigating the effect of MSW behaviour on the geosynthetic interface shear response in the composite liner system.…”

Section: Introductionmentioning

confidence: 99%

Effects of anisotropy in correlation structure on reliability-based slope stability analysis of a landfill

2020

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In this study, a reliability-based analysis of slope stability in a landfill considering the spatial variability of shear strength (c and φ) and unit weight ( γ) of municipal solid waste was performed using the random finite difference method. The effect of the anisotropic correlation (AC) structure of random variables including c, φ, and γ on mean and coefficient of variation (CoV) of safety factor values was investigated using Monte Carlo simulation. Also, probability of failure was determined through probability distribution fitting to a series of safety factor data. The results showed that the AC of the random variables has a significant effect on the stochastic safety factor of landfill slope. In general, the mean of the stochastic safety factor decreases with increasing horizontal and vertical correlation lengths (CLs). Also, the CoV of the safety factor increased with increase in horizontal or vertical CLs or both. Moreover, it was found that failure probability increases with an increase in the horizontal and vertical CLs and assuming isotropic structure for the correlation of random variables leads to the underestimation of failure probability. Overall, the results indicate that assuming an AC structure results in different failure mechanisms in the landfill slope, which are different from the deterministic cases.

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“…É também comum a formação de bolsões de lixiviado ou biogás com elevadas pressões neutras (Benvenuto e Cipriano, 2010;Colomer-Mendoza, 2013). Esta heterogeneidade de propriedades e o estado dos RSU nos maciços de aterros sanitários dificulta a análise de estabilidade (Jahanfar et al, 2017b).…”

Section: Introductionunclassified

“…Dentre os métodos utilizados nas análises de confiabilidade, destacam-se a FORM e o Monte Carlo, por possibilitarem baixa complexidade de interface computacional e serem muito utilizados em softwares de análise de estabilidade geotécnica, tais como apresentados em recentes trabalhos da literatura (Sia e Dixon, 2012;Petrovic et al, 2016;Jahanfar et al, 2017aJahanfar et al, , 2017bReddy et al, 2018). Esses métodos permitem a obtenção do índice de confiabilidade, o qual se relaciona com a probabilidade de ruptura de uma estrutura, possibilitando sua comparação com níveis de referência aceitáveis para projeto (Vardanega e Bolton, 2016;Beck, 2019).…”

Section: Introductionunclassified

Abordagem probabilística em análises de estabilidade de aterros sanitários: caso da ruptura do aterro sanitário de São João

Daciolo¹,

Correia²,

Boscov³

et al. 2020

Congresso Brasileiro De Mecânica Dos Solos E Engenharia Geotécnica

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RESUMO: Aterros sanitários são obras complexas e interdisciplinares que propiciam uma forma de disposição final ambientalmente adequada para os resíduos sólidos urbanos (RSU). Muitos casos de ruptura de aterros sanitários têm sido observados no Brasil e no mundo, decorrentes de falhas construtivas, acúmulo de pressões neutras e, principalmente, falhas nos projetos. Os RSU apresentam uma grande variabilidade em suas propriedades decorrentes de sua composição, estágio de degradação e metodologias de ensaios. Ademais, as metodologias de análises probabilísticas de estabilidade de taludes, baseadas no índice de confiabilidade, têm sido observadas em trabalhos recentes da literatura, sobretudo devido à melhor adequação em questões que envolvam grande variabilidade e dispersão dos parâmetros, bem como a influência da variabilidade espacial nos parâmetros dos resíduos. Nesta pesquisa, utilizando o comportamento estatístico dos parâmetros de resistência dos RSU, foi possível analisar a evolução dos fatores de segurança e probabilidades de falha com base na análise de ruptura da seção crítica do aterro sanitário Sítio São João. Foi possível verificar a sensibilidade do uso dos parâmetros estatísticos adotados e o alteamento no fator de segurança da estrutura. A partir dos métodos probabilísticos foi também possível obter a previsão da probabilidade de ruptura da estrutura.

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Municipal Solid Waste Slope Stability Modeling: A Probabilistic Approach

Cited by 25 publications

References 38 publications

Slope Stability of Landfill with Waste Degradation

Slope Stability of Landfill with Waste Degradation

Effects of anisotropy in correlation structure on reliability-based slope stability analysis of a landfill

Abordagem probabilística em análises de estabilidade de aterros sanitários: caso da ruptura do aterro sanitário de São João

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