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Effect of elevated temperature on solid waste shear strength and landfill slope stability
Jianyong Shi1,2, Shi Shu1,2, Yingbo Ai1,2
1Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, People's Republic of China.
Landfill slope stability is impacted by rising internal temperatures. This study found higher temperatures decrease solid waste shear strength, reducing the safety factor, but lowering leachate levels can improve stability.
Area of Science:
- Geotechnical Engineering
- Environmental Engineering
- Waste Management
Background:
- Slope instability in landfills is exacerbated by elevated internal temperatures.
- Limited research exists on solid waste (SW) strength characteristics and landfill slope stability (SS) under varying thermal conditions.
Purpose of the Study:
- To investigate the influence of temperature on SW strength properties.
- To develop a method for calculating SS considering temperature effects in landfills.
Main Methods:
- Conducted triaxial tests on SW across a spectrum of temperatures.
- Proposed and applied the circular slide method (CSM) for temperature-influenced SS analysis.
Main Results:
- SW cohesion decreased linearly with temperature; the internal friction angle remained stable.
- Increased temperatures reduced SW shear strength, shifting the critical sliding arc.
- A temperature rise from 20°C to 50°C decreased the landfill slope safety factor by over 20%.
Conclusions:
- Temperature significantly degrades SW shear strength, impacting landfill slope stability.
- Reducing leachate levels can mitigate high-temperature zones and enhance slope safety.
- Optimized placement of cooling pipes on the landfill liner is recommended for thermal control; the CSM is suitable for landfill SS analysis.
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