Evolution of saturated hydraulic conductivity with compression and degradation for municipal solid waste

Han, Ke; Hu, Jie; Xu, Xiangde; Wang, Wen Fang; Chen, Yunmin; Zhan, Liang Tong

doi:10.1016/j.wasman.2017.04.015

Cited by 38 publications

(11 citation statements)

References 26 publications

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“…Some scholars used laboratory experiments to study the changes in the water retention curve of wastes with different densities, degradation ages, and settlement processes [2,[4][5][6], and proposed some single domain models [7,8]. Many reports are published on the use of indoor tests [9][10][11][12] and field tests [13][14][15] on the saturated hydraulic conductivity of waste, but the existing technologies and methods are limited in terms of measuring the unsaturated hydraulic conductivity [16,17]. Thus, the data describing the WRC and K θ of MSW are limited [2,9,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Many reports are published on the use of indoor tests [9][10][11][12] and field tests [13][14][15] on the saturated hydraulic conductivity of waste, but the existing technologies and methods are limited in terms of measuring the unsaturated hydraulic conductivity [16,17]. Thus, the data describing the WRC and K θ of MSW are limited [2,9,[18][19][20]. Moreover, using a single domain model to describe the hydraulic characteristics wastes for predicting the water migration inside landfills often has a specific error in engineering practice because of the broad pore characteristics of wastes.…”

Section: Introductionmentioning

confidence: 99%

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Determination of Unsaturated Hydraulic Properties of Seepage Flow Process in Municipal Solid Waste

Chai

Liu

et al. 2021

Water

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The unsaturated hydraulic characteristics of waste soil are an essential basis for predicting and evaluating leachate migration and distribution in landfills. The saturated water content and permeability coefficient were measured, and a multi-step drainage monitoring experiment was conducted indoors at different dry densities, particle sizes, and degradation ages. Single and dual permeability models were adopted to determine the unsaturated hydraulic characteristic parameters of waste. Results show that dry density and particle size are the key factors affecting the saturated water content and permeability of waste. A single degradation age has little effect on it. Respectively, the saturated water content has a linear relationship with dry density, and permeability has an exponential relationship with dry density under limited experimental data. The overflow numerical inversion method can accurately obtain the unsaturated hydraulic characteristic parameters of wastes and summarizes the values of the unsaturated hydraulic characteristic parameters of wastes with different attributes in the literature and the results of this study. The dual-permeability model performed significantly better than the single-permeability model for water movement, suggesting that a dual-domain description is required for water flow in landfills.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of Unsaturated Hydraulic Properties of Seepage Flow Process in Municipal Solid Waste

Chai

Liu

et al. 2021

Water

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“…6. This is because MSW is a particulate material and a large proportion of the components have a high void ratio and high compressibility, and compaction processes will reduce pore size and change the geometry and continuity of pores, resulting in a decreasing area of flow [31,32]. In addition, permeability is dependent largely on the pore structure of waste in landfills [33].…”

Section: Parameters For Seepage and The Stability Analysismentioning

confidence: 99%

Soil Water Characteristic Curve Test of Waste under Different Compaction Densities and Analysis of the Multi-Factors that Affect the Instability of Landfill Slopes

Dang¹,

Chai²,

Xu³

et al. 2022

Pol. J. Environ. Stud.

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The soil water characteristic curves (SWCC) of municipal solid waste (MSW) samples with different compaction densities from the Jiangcungou landfill in Xi'an are tested in a laboratory. In addition, the Jiangcungou landfill was used to analyze the effect of different slope ratios, rainfall amounts and patterns, compaction degrees, and the leachate drainage system on stability of the landfill based on the saturated-unsaturated seepage theory and the Morgenstern-Price method. The results are summarized as follows. First, the SWCC of MSW samples with different compaction densities and the same components gradually converged with an increase in matric suction, and it nearly converged to one point when the matric suction was approximately 10 4 kPa. The volumetric water content of the converge point was the greatest in the deep layer, followed by the middle and shallow layers. Second, for the MSW samples with the same compositions, in the range of dry densities tested, MSW samples with a large compaction density tended to have a small α, a saturated water content of θ s and n v , and little differences in the residual water content, θ r . Third, for the compaction, drainage system, slope, and rainfall, the value of R (i.e., range) was 0.49, 0.22, 0.19, and 0.12, respectively, in the orthogonal test. Thus, the order of impact on the landfill is as follows: the compaction, drainage system, slope, and rainfall intensity.

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“…In terms of numerical analysis, the seepage of landfill is considered as saturatedunsaturated seepage [22][23][24][25][26][27][28][29][30][31][32]. Considering the heterogeneous characteristic of waste, Wang et al [33] analyzed the transport process of leachate of landfill by developing a saturated-unsaturated mathematical model.…”

Section: Introductionmentioning

confidence: 99%

Seepage Model of Heterogeneous Municipal Solid Waste Landfill and Application under Process of Waste Accumulation

Yang,

Ren,

Chang

et al. 2023

Water

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The distribution of leachate directly impacts the safety and stability of the landfill, so it is important to research the distribution of seepage characteristics and migration patterns of leachate. The study aims to investigate the impact of heterogeneous permeability distribution and clogging of the drainage layer on leachate transportation in landfills. To achieve this, a heterogeneous transient seepage model was developed. Results showed that when considering the heterogeneous permeability of the waste in the buried depth direction, the maximum perched water level was higher, which is not conducive to the safety and stability of the landfill. Taking Xi’an Jiangcungou Landfill as a research object, the maximum perched water level of each waste layer was higher compared to the homogeneous condition when considering the landfill process and heterogeneous permeability. The differential value ranged from 0.08 m to 1.88 m. Furthermore, the calculation results obtained from the heterogeneous seepage model were found to be in good agreement with both actual field data and referenced survey data, thus confirming the reliability of the model. These research findings not only offer technical support but also provide a solid theoretical foundation for leachate level control and safety and stability assessments.

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Evolution of saturated hydraulic conductivity with compression and degradation for municipal solid waste

Cited by 38 publications

References 26 publications

Determination of Unsaturated Hydraulic Properties of Seepage Flow Process in Municipal Solid Waste

Determination of Unsaturated Hydraulic Properties of Seepage Flow Process in Municipal Solid Waste

Soil Water Characteristic Curve Test of Waste under Different Compaction Densities and Analysis of the Multi-Factors that Affect the Instability of Landfill Slopes

Seepage Model of Heterogeneous Municipal Solid Waste Landfill and Application under Process of Waste Accumulation

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