Effect of cohesion and fill amplification on seismic stability of municipal solid waste landfills using limit equilibrium method

Savoikar, Purnanand; Choudhury, Deepankar

doi:10.1177/0734242x09348531

Cited by 21 publications

(6 citation statements)

References 14 publications

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“…14, 18 and 20), the minimum value of yield acceleration is obtained using the same optimization techniques as employed for obtaining the minimum factor of safety. In above analysis, a period of lateral shaking equal to 0.3 s is assumed, since for most of the geotechnical structures T = 0.3 s closely describes the practical state (Prakash 1981).…”

Section: Resultsmentioning

confidence: 99%

Seismic yield accelerations of MSW landfills by pseudo-dynamic approach

Choudhury

Savoikar

2010

Nat Hazards

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Estimation of seismic yield acceleration for the municipal solid waste landfills is the basic step for design to mitigate the hazard of earthquake on landfills. For most of the landfills constructed in the seismic zones, influence of the vertical component of seismic acceleration is often neglected assuming that it is not in phase with the horizontal seismic acceleration and hence does not affect the design parameters largely. Conventional pseudostatic analysis using limit equilibrium method does not consider the variation of seismic inertial forces with time and also effect of vertically propagating shear and primary waves, which can have serious effect on the design values. To overcome the limitations of existing methodology, in the present study, pseudo-dynamic approach, which takes into account the effects of time, primary and secondary waves, frequency of excitation, is applied for the first time for dynamic analysis of landfills for three different typical practical geometries of landfills. Chosen sets of landfills resemble some of the existing landfill geometries. Design equations and charts are developed for factor of safety against base sliding and seismic yield acceleration for these three typical landfill geometries. The results are compared with the similar results obtained by using conventional pseudo-static analysis, and the influence of vertical seismic acceleration on factor of safety against base sliding and yield acceleration is reported.

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Section: Resultsmentioning

confidence: 99%

Seismic yield accelerations of MSW landfills by pseudo-dynamic approach

Choudhury

Savoikar

2010

Nat Hazards

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“…The method was first applied in the seismic analysis of dams and embankments, then introduced to the seismic analysis of cover system (Koerner and Hwu 1991;Soong and Koerner 1996;Ling and Leshchinsky 1997;Feng et al 2012) and landfills (Feng et al 2010;Chen Y.M et al 2008;Choudhury et al 2010;Qian et al 2010). However, the analysis method for landfills is based on a 2D model rather than a more realistic.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Seismic Stability Analysis and Permanent Displacement of MSW Landfills

Feng

Li²

2014

Geoenvironmental Engineering

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A three-dimensional pseudo-static analysis method is developed to conduct seismic stability analysis for potential failures of a landfill along the liner system. In this calculated model, assuming that the horizontal coefficient k h and vertical coefficient k v are the same and known everywhere, the factor of safety and yield acceleration can be calculated based on the developed equations. Effects of the most significant parameters considered are investigated in this 3D model. Finally, the permanent displacement based on the calculated yield acceleration is obtained using the Newmark method. From the analysis results, it can be concluded that simply ignoring the size of a landfill will lead to overestimating the factor of safety and permanent displacement of landfills. Therefore, a 3D analysis considering the geometrical configuration of landfills will be more suitable for its seismic stability evaluation.

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“…In such cases, expansion of the capacity of existing landfills by constructing an engineered berm or retaining wall at the toe of the landfill provides an attractive solution. Savoikar and Choudhury (2009) analysed the seismic stability of typical side-hill type landfills using a two-wedge model with both pseudo-static and pseudo-dynamic approaches. The advantages include optimal use of the landfill area, high waste volume per unit area, low cost, less public opposition and easier obtaining of permits (Qian et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Seismic stability analysis of expanded MSW landfills using pseudo-static limit equilibrium method

Choudhury

Savoikar

2010

Waste Manag Res

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Capacity expansion of existing landfills is the most economical alternative to constructing new landfills where cost of land is prohibitive. From the safety point of view, the stability analyses of existing landfills expanded either vertically and/or laterally are required for different stages of construction, operation and during closure of a landfill. In the present study, a pseudo-static limit equilibrium seismic stability analysis was performed for a typical side-hill type municipal solid waste (MSW) landfill expanded using an engineered berm. Seismic stability analyses were performed for the two critical cases, namely when the failure surface passes below the berm (under berm) and when the failure surface passes over the back slope of the berm (over berm). Close-form solutions were developed for the upper bound and lower bound factor of safety and the yield acceleration of such slopes under both failure conditions. From parametric analyses it was observed that as the height of the berm increased, the factor of safety for both the over-berm failure and the under-berm failure conditions also increased. The average factor of safety and yield acceleration coefficient were found and the under-berm failure condition became critical for a back slope steeper than 1.7H : 1V. The average factor of safety decreased as both horizontal and vertical seismic accelerations increased. Comparisons between the present results and those in the literature for the static case showed good agreement and the present results of the pseudo-static seismic case were found to be of particular importance.

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Effect of cohesion and fill amplification on seismic stability of municipal solid waste landfills using limit equilibrium method

Cited by 21 publications

References 14 publications

Seismic yield accelerations of MSW landfills by pseudo-dynamic approach

Seismic yield accelerations of MSW landfills by pseudo-dynamic approach

Three-Dimensional Seismic Stability Analysis and Permanent Displacement of MSW Landfills

Seismic stability analysis of expanded MSW landfills using pseudo-static limit equilibrium method

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