Numerical modeling of the nonlinear mechanical behavior of multilayer geosynthetic system for piggyback landfill expansions
Section snippets
Introduction and background
Landfills are increasingly becoming technical-engineering constructions in which waste, various geosynthetics (GSYs), and natural materials (clay, sand, gravel) interact within the lining system (Tano and Olivier, 2014). In a piggyback landfill expansion (PBLE), where a new landfill is built over an older one, these interactions are particularly important because they control the shear stress at the interfaces between GSYs and their deformation and thereby determine the integrity of the lining
General description of model
The model is based on realistic conditions and consists of a mixed PBLE with an existing 20-m-high waste cell and a proposed, 20-m-high vertical extension. The entire PBLE sits on a 400-m-long section of in situ stiff clay.
Fig. 1 shows a schematic diagram of the model used in this study, which includes two types of materials: The first is municipal solid waste (MSW) contained in the landfill. The MSW is subdivided into old and new waste, corresponding to the existing cell and the new cell,
Materials, geosynthetics, and interface properties
The elasto-plastic Mohr-Coulomb (MC) constitutive model is used to model the soil, the waste material, and the interface behavior. The MC parameters are preferred over the parameters of complex constitutive models such as the creep model. The MC model was used in the majority of the studies mentioned above and is one of the most used in numerical modeling. Thus, the model parameters described in the following section refer to the MC model.
Methodology
The differentiation between the compressive and tensile characteristics of GSYs was investigated by a series of simulations in which the ratio between the tensile modulus (E_tract) and the compressive modulus (E_comp) was decreased. Each simulation is done on the GMB which is the main component of the lining system. To better compare the force, we use the peak friction angle because it leads to overall higher forces within the GMB. The parametric study was done with ten values of E_comp and a
Differentiation between compressive and tensile characteristics of geosynthetics
Fig. 12 shows the axial tensile and compressive forces calculated for the GMB for each of the ten moduli and for zero compressive strength at two backfilling levels (H = 20 m and 40 m). From this figure, the tensile forces are seen to be nonlinear in E_comp. Moreover, the lowest tensile forces (33.1 kN at H = 40 m) correspond to the two cases E_comp = E_tract and R_comp = 0; they are thus the least-safe cases. At H = 40 m, the difference between these cases and the others reaches 13.9% (≈33 kN
Summary and conclusions
Numerical modeling techniques are increasingly used to assess the performance of engineering works involving multilayered geosynthetic (GSY) systems. The present work applies comprehensive, state-of-the-art numerical modeling to study the interactions between multiple layers of GSYs. The results reveal the consequences of the conventional assumptions made regarding the mechanical behavior of both the interfaces and the GSY. These simplifying assumptions involve the strain-softening behavior at
Acknowledgments
Special thanks are due to J. Bruhier at Huesker France for the productive discussions and for providing us with technical data on their geogrid (GGR), geotextile (GTX), and geosynthetic clay liner (GCL) products. We also thank AfitexFrance (GTX), Fibertex France (GTX), Maccaferri France (GGR), and SKZ Germany (GTX, GCL) for the technical data sheets and the associated tensile tests. Finally, we are grateful to D. Croissant at IRSTEA Antony, France and to P. Mailler at IFTH, France for the
References (107)
- et al.
Pullout and shear tests on geogrid reinforced lightweight aggregate
Geotext. Geomembr.
(1998) - et al.
Evaluation of interface shear strength of composite liner system and stability analysis for a landfill lining system in Thailand
Geotext. Geomembr.
(2006) - et al.
Controlling strain in geosynthetic liner systems used in vertically expanded landfills
J. Rock Mech. Geotech. Eng.
(2009) - et al.
Investigation of mechanisms of bentonite extrusion from GCL and related effects on the shear strength of GCL/GM interfaces
Geotext. Geomembr.
(2010) Shear strength of geosynthetic composite systems for design of landfill liner and cover slopes
Geotext. Geomembr.
(2011)- et al.
Shear strength of geomembrane-soil interface under unsaturated conditions
Geotext. Geomembr.
(2006) - et al.
Validation of a numerical modelling technique for multilayered geosynthetic landfill lining systems
Geotext. Geomembr.
(2008) - et al.
Comparison of slope stability in two Brazilian municipal landfill
Waste Manag.
(2008) - et al.
Problem of friction posed by the use of geomembranes on dam slopes-examples and measurements
Geotext. Geomembr.
(1990) Mathematical model of geomembrane stress-strain curves with a yield peak
Geotext. Geomembr.
(1994)
Geomembrane-sand interface frictional properties as determined by inclined board and shear box tests
Geotext. Geomembr.
Landfill lining stability and integrity: the role of waste settlement
Geotext. Geomembr.
Stability and tension considerations regarding cover soils on geomembrane lined slopes
Geotext. Geomembr.
Behavior of geogrid reinforced sand and effect of reinforcement anchorage in large-scale plane strain compression
Geotext. Geomembr.
Soil–geosynthetic interaction: modelling and analysis
Geotext. Geomembr.
A design chart for estimation of horizontal displacement in municipal landfill
Waste Manag.
Analysis of geosynthetic lining systems (GLS) undergoing large deformations
Geotext. Geomembr.
Investigation on failure of a geosynthetic lined reservoir
Geotext. Geomembr.
Deformation of landfill from measurement of shear wave velocity and damping
Geotechnique
NF EN 12311–2 : Feuilles souples d'étanchéité - Détermination des propriétés en traction – Partie 2 : Feuilles d'étanchéité de toiture plastiques et élastomères
NF EN ISO 10319 : Géosynthétiques – Essai de traction des bandes larges
Seismic analysis of geosynthetic liner system
Hydrogeological and geotechnical properties of refuse using a large scale compression cell
Shear strength of municipal solid waste
J. Geotech. Geoenviron. Eng.
Cause and mechanism of failure of Kettleman Hills landfill B-19, phase IA
Stab. Perf. Slopes Embankments ASCE
Geomechanical properties of municipal solid waste in Dona Juana sanitary landfill
Seismic imaging of a leachate-recirculation landfill: spatial changes in dynamic properties of municipal solid waste
J. Hazard. Toxic Radioact. Waste ASCE
Stability of slopes in a sanitary landfill
Experimental analysis of waste compressibility
Geotech. Spec. Publ. ASCE
Old landfill expansion in the vertical expansion
Performance-based design for geosynthetic liner systems in landfills
Geotech. Eng. J. SEAGS AGSSEA
Reanalysis of a municipal landfill slope failure near Cincinnati, Ohio
U. S. A. Can. Geotech. J.
Factors Controlling the Waste/barrier Interaction with Specific Consideration to the Integrity of Steep-sided Landfill Lining Systems
Density and strength properties of Hong Kong refuse
Variability analysis of soil vs. geosynthetic interface friction characteristics by multiple direct shear testing
Geotechnical parameters of sanitary wastes
Interface shear strength variability and its use in reliability-based landfill stability analysis
Geosynth. Int.
Etude géotechnique dans le cadre d'un projet d'extension d'ISDND en Ile de France, Résultats des investigations de terrain et des essais de laboratoire
Shear Strength of Municipal Solid Waste -Interim Report – Year 1
Geomembrane-geotextile interface friction
J. Teknol. Berkelanjutan
Municipal solid waste slope failure – I: waste and foundation soil properties
J. Geotech. Geoenviron. Eng. ASCE
Progressive failure ol lined waste impoundments
J. Geotech. Geoenviron. Eng. ASCE
Modelling of waste barrier interaction
Analysis of a landfill directive compliant steepwall lining system
Analysis of Steep Sided Landfill Lining Systems
Geotechnical properties of solid waste
Geotech. Test. J. ASTM
Deformation and Stability of Intermediate Liner for Landfill Expansion and Controlling Measures
Cited by (18)
Seismic analysis of landfill using advanced numerical approach considering material and contact nonlinearity
2023, Engineering GeologyCitation Excerpt :The liner system was modeled by the contact pair. To take the displacement-softening behavior into account, peak and residual friction coefficients are set as 0.4 and 0.08 respectively (Table 1), which are generally used values for geosynthetic interfaces of liner systems (Bergado et al., 2006; Tano et al., 2016; Feng et al., 2019b; Rowe and Yu, 2019). The MSW was considered as porous media and the initial water level ratio was approximately set as 0.5 according to the field investigation results reported by He et al. (2018).
Numerical study of strain development in high-density polyethylene geomembrane liner system in landfills using a new constitutive model for municipal solid waste
2022, Geotextiles and GeomembranesCitation Excerpt :However, such testing is time consuming and expensive and thus cannot be used to investigate all of the factors affecting the development of tensile stains in a liner system. Numerical analysis has proven to be a useful tool for studying these factors (Villard et al., 1999; Filz et al., 2001; Jones and Dixon, 2005; Fowmes, 2007; Fowmes et al., 2008a, 2008b; Arab, 2011; Sia and Dixon, 2012; Zamara et al., 2014; Thiel et al., 2014; Wu, 2013, 2017; 2017; Tano et al., 2016, 2017; Yu and Rowe, 2018a, 2018b, 2020; Kavazanjian et al., 2018; Rowe and Yu, 2019). Numerical analyses have shown that the compressive (volume change) behavior of the waste body is a key factor in the development of tensile strains in a landfill liner system (Jones and Dixon, 2005; Thiel et al., 2014; Chouksey and Sivakumar Babu, 2015).
A constitutive model for geosynthetic interfaces considering nonlinear softening behavior
2022, Computers and GeotechnicsPerformance issues of barrier systems for landfills: A review
2021, Geotextiles and GeomembranesGeosynthetic reinforced piled embankment modeling using discrete and continuum approaches
2021, Geotextiles and GeomembranesDetermination of geomembrane – protective geotextile friction angle: An insight into the shear rate effect
2020, Geotextiles and Geomembranes