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Liquid-gas responses during rainfall test in MSW landfill
Chao Liu1, Jianyong Shi2, Yingbo Ai2
1College of Civil Engineering, Yancheng Institute of Technology, Yancheng 224051, China; Geotechnical Engineering Research Institute, Hohai University, Nanjing 210024, China; Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210024, China.
Rainfall infiltration in landfills increases water content and pore gas pressure, impacting slope stability. Reduced gas permeability in shallow waste exacerbates pressure buildup in deeper layers.
Area of Science:
- Environmental Engineering
- Geotechnical Engineering
- Hydrogeology
Background:
- Rainfall infiltration into landfills is common.
- Liquid-gas interactions within waste are complex and affect slope stability.
Purpose of the Study:
- To investigate simultaneous responses of volumetric water content and pore gas pressure to rainfall infiltration.
- To understand coupled hydro-gas behavior in landfills.
Main Methods:
- Conducted a simulated rainfall test at the Changzhou landfill.
- Monitored volumetric water content and pore gas pressure.
Main Results:
- Prolonged rainfall increased water content and pore gas pressure, then stabilized.
- Water content changes decreased with depth; pore gas pressure changes increased with depth.
- Increased water content in shallow waste reduced gas permeability, raising pore gas pressure in deeper layers.
Conclusions:
- Findings highlight the novelty of capturing simultaneous liquid-gas phase responses.
- Provides insights into coupled hydro-gas behavior during landfill rainfall infiltration.
- Informs landfill slope stability assessments under hydrologic stress.
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