Landfill Slope Stability Improvement Incorporating Reinforcements in Reclamation Process Applying Observational Method (original) (raw)
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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°.
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.
Waste management (New York, N.Y.), 2011
Limited space for accommodating the ever increasing mounds of municipal solid waste (MSW) demands the capacity of MSW landfill be maximized by building landfills to greater heights with steeper slopes. This situation has raised concerns regarding the stability of high MSW landfills. A hybrid method for quasi-three-dimensional slope stability analysis based on the finite element stress analysis was applied in a case study at a MSW landfill in north-east Spain. Potential slides can be assumed to be located within the waste mass due to the lack of weak foundation soils and geosynthetic membranes at the landfill base. The only triggering factor of deep-seated slope failure is the higher leachate level and the relatively high and steep slope in the front. The valley-shaped geometry and layered construction procedure at the site make three-dimensional slope stability analyses necessary for this landfill. In the finite element stress analysis, variations of leachate level during constructi...
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...
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...
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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.
Linnaeus Eco-Tech
In Germany, in the 1990 decade, new models of stability analysis in sanitary landfills hadbeen developed. These models were based in the study of reinforcement effect of the fibrespresent in the composition of the MSW. This reinforcement comes from materials as plastics,papers, cardboards, rubber, wood and textiles. The reinforcement in the MSW shear strengthcan be denominated as fibrous cohesion or pseudo-cohesion. For the inclusion of thisreinforcement it is necessary to classify the waste according to its morphology. Percentage ofmaterials with dimension I + dimension 2 will indicate the values to be used. For thisclassification the German technical recommendation GDA E 1-7 should be followed [I] .According to this recommendation, in stability analyses of sanitary landfills, the modelconsidering the reinforcement effect of the fibres should be used. It intends to bring a betterunderstand of the factors that had lead into failures in the past in landfills (back-analysis). Inadditi...
Stability Enhancement of Landfills on Sloping Ground Using Earthen Berms at the Toe
Proceedings of the 8th International Congress on Environmental Geotechnics Volume 2, 2018
This paper presents the results of a study undertaken to enhance the stability of a landfill on sloping ground of a hilly region. The base of the landfill has a significant elevation difference from one end to the other causing an overall inclination of the base with the horizontal. The study highlights the influence of the following factors on the base sliding stability along the geomembrane interface as: (a) leachate head; (b) pore water pressures in wet waste; (c) seismic forces and (d) smooth versus textured geomembrane (GM). Limit equilibrium methodology is adopted for analyses and three types of failure surfaces are analysed – circular, planar (single straight line) and planar (two straight lines). The study reveals that stability against sliding along liner is low, whenever (a) pore pressures/leachate head are high; (b) earthquake forces are large and (c) smooth GM are used. Usually planar failure surface (two straight lines) is observed as the critical surface.
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.
SEISMIC BEHAVIOUR OF GEOSYNTHETIC REINFORCED MUNICIPAL SOLID WASTE LANDFILLS
Municipal Solid Waste (MSW) is extremely heterogeneous and its properties involve significant uncertainties. MSW landfills are an integral part of waste management and disastrous consequences happen if seismic vulnerability of these landfills is ignored. Therefore, seismic response analysis of municipal solid waste (MSW) landfills is receiving considerable attention these days. This paper presents dynamic response analysis of MSW landfills constructed on different sub soils. One dimensional dynamic response analysis of these landfills has been carried out using the computer code SHAKE2000. Since the seismic response of any structure depends on amplitude of ground motion, the effect of this parameter on the behaviour of MSW landfills are studied. The landfill profiles adopted for this study consists of different components to a height of 30 m incorporated with geosynthetic layers as bottom and cover liners. The influence of geosynthetic reinforcements on the performance of these landfills due to dynamic loading is also explored. The results of the study indicate that the amplification of ground motion parameters decreased consistently with the usage of reinforcements. Rock and stiff sub soil strata showed significant reduction in peak ground acceleration and spectral acceleration values at the top of landfill with inclusion of reinforcements where as this reduction is not observed in soft sub soil conditions.