Stability Analysis and Control Measures of a Sanitary Landfill with High Leachate Level

Feng, Shi‐Jin; Chang, Ji-Yun; Zhang, Xiaolei; Shi, Hao; Wu, Shao-Jie

doi:10.1061/(asce)gt.1943-5606.0002635

Cited by 8 publications

(4 citation statements)

References 38 publications

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“…In addition, these theoretical models do not consider the influence of the water level on slope stability due to (1) rainfall [14]; (2) a large amount of leachate generation [15,16]; and (3) leachate recirculation in the bioreactor landfill [17,18], resulting in the elevation of pore pressure in the slope and the accumulation of a large amount of leachate inside the waste body. Similarly, this is also a defect of the traditional slope limit equilibrium analysis method in the application of landfill stability analysis [19].…”

Section: Introductionmentioning

confidence: 99%

Limit Equilibrium Analysis of Landfill Instability Based on Actual Failure Surface

Li,

Chen,

Lin

2023

Applied Sciences

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Slope stability is one of the key engineering problems in the whole lifetime of landfills. In this paper, combined with the wedge limit equilibrium analysis, a landfill stability analysis method based on the actual failure surface is proposed, and the model is verified according to the data of centrifuge model tests. It is found that this method can more accurately calculate the factor of safety (FS) of the slope of the landfill and evaluate the stability of the slope. Finally, sensitivity analysis was conducted to evaluate the effects of the actual failure surface angle, water level, soil parameters, and the presence or absence of a dam on the factor of safety.

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Section: Introductionmentioning

confidence: 99%

Limit Equilibrium Analysis of Landfill Instability Based on Actual Failure Surface

Li,

Chen,

Lin

2023

Applied Sciences

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“…Published experimental data on the smooth geomembrane/geotextile interfacial strength indicate that the maximum normal stress that could be applied using a ring shear apparatus was 480 kPa [13]. However, the normal stress acting on the bottom lining system of the majority of municipal solid waste landfills has exceeded 480 kPa [14][15][16][17][18][19][20][21][22][23][24][25][26]. This normal stress has even exceeded 2 MPa in some leachate ponds [27,28].…”

Section: Introductionmentioning

confidence: 99%

Strength Characteristics of a Smooth HDPE Geomembrane/Nonwoven Geotextile Interface Based on a Novel Ring Shear Apparatus

et al. 2023

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This paper aims to investigate the interfacial strength characteristics, particularly the residual strength, of a high-density polyethylene smooth geomembrane (GMB-S)/nonwoven geotextile (NW GTX) interface using a novel ring shear apparatus under high normal stresses and two specimen conditions. A total of eight normal stresses (from 50 kPa to 2308 kPa) and two specimen conditions (dry and submerged at ambient temperature) are considered in this study. The reliability of using the novel ring shear apparatus to study the strength characteristics of the GMB-S/NW GTX interface was demonstrated by conducting a series of direct shear experiments with a maximum shear displacement of 40 mm and ring shear experiments with a shear displacement of 10 m. The peak strength, post-peak strength development, and residual strength determination method of the GMB-S/NW GTX interface are explained. Three exponential equations suitable for characterizing the relationship between the post-peak friction angle and the residual friction angle of the GMB-S/NW GTX interface are established. This relationship can be used with the relevant apparatus (i.e., an apparatus with deficiencies in executing large shear displacement) in determining the residual friction angle of the high-density polyethylene smooth geomembrane/nonwoven geotextile interface.

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“…On one hand, a high leachate level will cause high water pressure at the upper boundary of the bottom liner system, which promotes the migration of leachate pollutants and ensuing pollution into underground water and soil [3,4]. On the other hand, a high leachate level will increase the pore water pressure of the landfilled MSW, which reduces the shear strength of the MSW and so affects the stability of the landfills [5][6][7][8]. In addition, a high leachate level may impede the migration and collection of the landfill gas and induce the occurrence of gas accumulation in the MSW, further increasing the pore water pressure of the MSW [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Laboratory Model Tests of Leachate Drawdown Using Vertical Drainage Wells with Vacuum Pumping in Municipal Solid Waste Landfills with High Leachate Levels

Ni³

et al. 2022

Sustainability

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Municipal solid waste (MSW) landfills in China generally have high leachate mounds, which potentially induce severe geotechnical and environmental issues. In this study, laboratory model tests were carried out to preliminarily investigate the performance of vertical drainage wells accompanied with vacuum pumping (VDW-VP) on leachate drawdown in MSW landfills with high leachate levels. Leachate drawdown tests through VDW-VP under conditions with and without gas injection were performed. Different vacuum pressures (0~−9.5 kPa) were imposed during the tests. Results indicated that the leachate pumping processes for both the two conditions were characterized by a stage of continuous effluent followed by a stage of discontinuous effluent, corresponding to the periods before and after the leachate level in the vertical well dropped to the bottom, respectively. During the stage of continuous effluent, as the vacuum pressure increased, the effluent rate decreased and the leachate level in the vertical well needed a longer time to reach the bottom. During the stage of discontinuous effluent, the leachate level in the MSW gradually approached that in the vertical well. A higher vacuum pressure rendered a larger cumulative leachate pumping volume for the condition with a gas injection, but this was not the case for the condition without a gas injection. In addition, some local pore water pressures were observed to suddenly increase and drop under the condition with the gas injection, attributed to the migration of entrapped gas zones. The increase in vacuum pressure might promote the migration of entrapped gas zones and hence increase the cumulative leachate pumping volume.

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Stability Analysis and Control Measures of a Sanitary Landfill with High Leachate Level

Cited by 8 publications

References 38 publications

Limit Equilibrium Analysis of Landfill Instability Based on Actual Failure Surface

Limit Equilibrium Analysis of Landfill Instability Based on Actual Failure Surface

Strength Characteristics of a Smooth HDPE Geomembrane/Nonwoven Geotextile Interface Based on a Novel Ring Shear Apparatus

Laboratory Model Tests of Leachate Drawdown Using Vertical Drainage Wells with Vacuum Pumping in Municipal Solid Waste Landfills with High Leachate Levels

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