A hybrid method for quasi-three-dimensional slope stability analysis in a municipal solid waste landfill (original) (raw)
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Slope Stability of Landfill with Waste Degradation
International Journal of Innovative Technology and Exploring Engineering, 2019
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...
Landfills are currently the world most-used available technique for solid waste final management. Following the most recent environmental regulations on solid waste management, it is necessary to perform a stability analysis of the waste-slopes in order to obtain the environmental authorization prior to the opening of the facility. These analyses have usually been performed considering a homogeneous distribution of geotechnical and hydrogeological parameters, such as cohesion, wet content or permeability. This poster shows the first results obtained when considering both homogeneous and hetereogeneous parameter distribution on the slope-stability of a municipal landfill using a commonly used 2D slope stability model. Several classical methodologies (Bishop method, Janbu method or Morgestern-Price method) have been applied to obtain the slope stability security factors under different scenarios. The modelling has been applied to several solid waste landfills of Valencia Region in Spain.Results shown here are those obtained on the waste landfill of Aspe (Alicante.
Factors Affecting Stability and Slope Failure of Landfill Sites: A Review
Landfill is still the most cost-effective method of solid waste disposal. Every kind of pretreatment and incineration process is applied to the wastes, as a result, non-processable wastes are formed such as ash, non-recyclable wastes, etc. Therefore, the landfill method is still considered to be inevitable. It is essential to prevent slope failure during the entire landfill process such as site construction, waste acceptance, laying-compaction, intermediate cover and final cover. For this, it is important that the planning of the sanitary landfill facility is made by considering the engineering criteria of the project and then the operation. In some landfill facilities, slope failure is experienced at various scales due to mistakes made during these stages. In this study, taking into account the slope failure in the past, cause-effect relationships and mistakes will be analyzed, and determinations about solution alternatives will be made about solution alternatives.
Influence of the Design on Slope Stability in Solid Waste Landfills
Earth sciences, 2013
This paper presents, firstly, the influence of the geometry of a slope in the safety factor (SF). In order to do this, the SF is compared among three types of slopes: with berms every 7 m high and a dam at the toe, without berms and with a dam at the toe, and without berms nor dams. It was observed that, for the same inclination, the berms do not significantly influence the stability. However, the construction of an earth dam at the base increases safety, especially with little height and slope in waste with poor mechanical properties. On the other hand, a set of diagrams to learn, quickly and easily, the safety factor of a landfill slope has been developed. Thus, this set of diagrams allows calculations from the SF height (from 17 to 80 m) and slope inclination (from 45° to 14°) with values of effective cohesion of the waste (C'o) from 1 to 3 t/m 2 and effective friction angle (Φ') of 10° to 25°.
Analysis and Modelling of Slope Failures in Municipal Solid Waste Dumps and Landfills: A Review
Nature Environment and Pollution Technology, 2021
The essential issues solved by geoenvironmental engineers relate to the assurance of uncontaminated regions of the subsurface just as the remediation of locales of the subsurface that have been sullied by releasing waste materials, spilling over the ground and underground stockpiling tanks and penetration of pesticides. In city areas, garbage and waste materials are generally dumped into landfills. A landfill site, which is otherwise called a trash dump, is used for the disposal of waste materials by burial. A safe landfill is a deliberately built sorrow in the ground into which wastes are put. The principal objective is to stay away from any water driven association between the wastes and the surrounding environment especially groundwater. This paper discusses landfill, in terms of its construction, stability and failure. The analysis and modelling of the landfill failure occurred in different countries like Poland, Turkey, Israel, the Philippines, China and Sri Lanka which are dis...
Applied Sciences
This paper concerns a case study presenting one of the biggest landfills in Poland that required application of complex engineering works to extend the deposing capacity of the structure. The shear strength parameters of the subsoil and waste material used for analyses were based on geotechnical investigation and were then applied in slope stability analyses of the landfill. For the purpose of safety management of the new development and reclamation plan for the landfill, an observational method was applied to increase the geotechnical safety of the structure. The slope reinforcement methods mainly included the geogrid, geocomposite, and berms construction. However, much of the uncertainty associated with the stability of the geogrid-reinforced slope is related to the time-dependent deformation of geosynthetic materials. For the purpose of changes in the geogrid parameters with time, the samples were excavated from the landfill slope after 20 years of exploitation and analyzed in th...
REVIEW ON STABILITY ISSUES OF LANDFILL WASTE SLOPE
Stability of landfill waste mass slope is very complex topic to study as compare to conventional soil slope. Various past research and theories have been reviewed for present study to understand the various aspects of stability issues of landfill waste slope. There are many factors which affect stability of slope such as heterogeneity of landfill waste, leachate recirculation in waste mass etc. Present study also reviewed different methods of slope stability analysis, which were used in past studies of stability analysis of landfill waste slopes.
Reanalysis of the Kettleman Hills Landfill Slope Stability Failure
2013
The paper presents results of the Kettleman Hills landfill slope stability failure reanalysis in two – dimensional and three dimensional models. The analysis was per fo med using the computer codes FLAC (v.5.0) and FLAC3D (v.40), respectively, which are Finite Difference Method co des. The investigation was based on Shear Strength Reduction Technique (SSR). The approach taken considered the problem as one of statics . The failure was caused by waste mass movement along the slip surface located in the geos ynthetic layer, which was characterised by relatively low st rength properties as compared with values of these paramet ers for the waste layer as well as for the subgrade. Obtained v alues for the factor of safety differ from each other and depend on the kind of analysis conducted. These results are caused by the possibility of performing the real geometry of the landfill in 3D modelling issues.
Stability Analyses of Municipal Solid Waste Landfills with Decomposition
Geotechnical and Geological Engineering, 2009
A bioreactor landfill is operated to enhance refuse decomposition, gas production, and waste stabilization. Some of the potential advantages of bioreactor include rapid stabilization of waste, increased landfill gas generation, gain in landfill space, enhanced leachate treatment, and reduced post closure maintenance period. Due to the accelerated decomposition and settlement of solid waste, bioreactor landfills are gaining popularity as an alternative to the conventional Subtitle D landfills. However, the addition of leachate to accelerate the decomposition changes the physical and engineering characteristic of waste and therefore affects the geotechnical characteristics of waste mass. The changes in the physical and mechanical characteristics of solid waste with time and decomposition are expected to affect the shear strength of waste mass. The objective of this paper is to analyze the stability of solid waste slopes within the bioreactor landfills, as a function of time and decomposition. The finite element program PLAXIS is used for numerical modeling of bioreactor landfills. Stability analysis of bioreactor landfills was also performed using limit equilibrium program STABL. Finally the results from finite element program PLAXIS and limit equilibrium program STABL are compared. GSTABL predicted a factor of safety of more than 1 in all the cases analyzed, whereas PLAXIS predicted a factor of safety of less than 1 at advanced stages for a slope of 2:1. However, the interface failures between solid waste and landfill liners have not been considered in this paper.
Review of the waste slope stability design of a landfill site in gauteng
E3S Web of Conferences
The objective of this paper is to review the slope stability analysis conducted during the initial design stages of a new landfill cell that forms part of a landfill site expansion in Gauteng. The SLOPE/W slope stability software, from the Geostudio integrated software suite, was used to carry out the analysis. Initial trials revealed a significant waste slope instability, which, when further investigated, was attributed to the weak sliding interface between the smooth geomembrane and clay, the 8 m deep basin, the 46 m estimated waste height leaning on a small embankment on the northern side of the cell and the cell basin sloped in the direction of the waste sliding mass. Satisfactory results and eventually slope stability was achieved through a comprehensive optimization process which entailed modelling and running iterations of various trials of a combination of stabilizing berms, geogrids and cutting back the waste slope.