Waste containment barrier systems subject to seismic loading

Lin, Jiale

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https://hdl.handle.net/2142/120218 Copy

Description

Title

Waste containment barrier systems subject to seismic loading

Author(s)

Lin, Jiale

Issue Date

2023-03-24

Director of Research (if dissertation) or Advisor (if thesis)

Stark, Timothy D.

Doctoral Committee Chair(s)

Stark, Timothy D.

Committee Member(s)

• Mesri, Gholamreza
• Gardoni, Paolo
• Fowmes, Gary

Department of Study

Civil & Environmental Eng

Discipline

Civil Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

• Landfill
• Bottom liner system
• Progressive failure
• LD shear strength
• Residual shear strength

Abstract

A numerical method for evaluating the permanent displacements along geosynthetic interfaces in a bottom liner system for a municipal solid waste (MSW) landfill was developed using a large strain finite difference numerical software package marketed as FLAC 8.0 (Fast Lagrangian Analysis of Continuum from Itasca (2021)). The numerical method accounts for the interaction between different geosynthetic layers in the bottom liner system during construction, waste filling, waste decomposition and settlement to estimate the shear displacements induced along the critical geosynthetic interface in the static condition. The biodegradation behavior of the MSW was modeled using the Cam-clay soil constitutive model built-in to FLAC. Later, seismic time history was applied on the bottom of the landfill to estimate the extra displacement over the interface. Extensive laboratory geosynthetic interface shear testing was conducted to understand the behavior of typical bottom liner system interfaces, e.g., textured geomembrane/double-sided geosynthetic drainage composite (GMX/GDC) and textured geomembrane/non-woven geotextile (GMX/NGT), to develop the numerical model. Based upon the comparison of numerical results to experimental data, a beam element was developed to model the geomembrane. The beam element was attached to a general element in the model by interface elements to simulate static and seismic shear behavior of the geosynthetic interface, e.g., GMX/GDC. These beam-interface-general elements (BIGE) model allows for post-peak strength loss with increasing static and seismic shear displacement until a residual, i.e., constant minimum, shear strength is reached. The ability of the finite difference model to predict shear forces and shear displacements in BIGE model is demonstrated using a model of an MSW landfill subjected to a low-level earthquake. The numerical model is then used to conduct back analyses of the performance of a lined MSW landfill to predict the post-peak strength loss with increasing static and seismic shear displacement until a residual, i.e., constant minimum, shear strength, which would result in failure of the slope.

Graduation Semester

2023-05

Type of Resource

Thesis

Copyright and License Information

Copyright 2023 Jiale Lin

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