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<p>Landfills serve as artificial geological structures for the disposal of municipal solid waste (MSW). They can not only result in geotechnical disasters due to the combined effects of groundwater level and earthquake, but also contribute to the contamination of groundwater and soil. To reduce the risk of geomembrane tearing and prevent leaks, geotextiles are often used as protective layers for geomembranes. However, this may simultaneously increase the risk of sliding in the landfill. To address this issue, centrifuge shaking table tests were conducted on two types of composite liner systems (with and without geotextile) under three different earthquake magnitudes and groundwater levels at 50<i>g</i>. Acceleration response, pore water pressure, deformation, and geomembrane tension were measured during the tests. Additionally, correlation analysis and k-means clustering algorithms were employed to classify the different conditions. The critical curves and risk level contour maps for landfills with two types of liner systems under the combined effects were obtained. The acceleration response is influenced by both water level and seismic magnitude. The frequency spectrum of the landfill is affected by both the type of liner and groundwater level. Deformation occurs even at low-magnitude earthquakes under no groundwater level conditions with geotextile. In cases with geotextiles, the peak pore water pressure at each point is approximately 1.3 times higher than that without geotextiles. The critical risk level separating safe conditions and hazardous conditions in landfills is 0.5. The experimental results provide a basis for establishing earthquake damage standards for landfills with different liner systems and water levels.</p>

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Centrifuge modeling test on response of landfill with composite liner under combined effects of water level and earthquake

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Haoyu Lin,
  • Haijian Xie,
  • Junchao Li,
  • Yegan Yan,
  • Jianqun Jiang,
  • Yunmin Chen

摘要

Landfills serve as artificial geological structures for the disposal of municipal solid waste (MSW). They can not only result in geotechnical disasters due to the combined effects of groundwater level and earthquake, but also contribute to the contamination of groundwater and soil. To reduce the risk of geomembrane tearing and prevent leaks, geotextiles are often used as protective layers for geomembranes. However, this may simultaneously increase the risk of sliding in the landfill. To address this issue, centrifuge shaking table tests were conducted on two types of composite liner systems (with and without geotextile) under three different earthquake magnitudes and groundwater levels at 50g. Acceleration response, pore water pressure, deformation, and geomembrane tension were measured during the tests. Additionally, correlation analysis and k-means clustering algorithms were employed to classify the different conditions. The critical curves and risk level contour maps for landfills with two types of liner systems under the combined effects were obtained. The acceleration response is influenced by both water level and seismic magnitude. The frequency spectrum of the landfill is affected by both the type of liner and groundwater level. Deformation occurs even at low-magnitude earthquakes under no groundwater level conditions with geotextile. In cases with geotextiles, the peak pore water pressure at each point is approximately 1.3 times higher than that without geotextiles. The critical risk level separating safe conditions and hazardous conditions in landfills is 0.5. The experimental results provide a basis for establishing earthquake damage standards for landfills with different liner systems and water levels.