Centrifuge shaking table test studies on mechanically biologically treated waste
Wenjie Chen1,2, Zhenying Zhang1,2, Hui Zhu1
1School of Engineering Science, Shandong Xiehe University, Jinan, China.
Summary
Mechanically biologically treated (MBT) waste dynamic properties were studied using centrifuge shaking tables. MBT waste shows dilatancy, a 1-7 Hz natural frequency range, and reduced pore pressure with depth, indicating stability for seismic landfill design.
Area of Science:
- Geotechnical Engineering
- Environmental Engineering
- Waste Management
Background:
- Mechanically biologically treated (MBT) waste requires understanding its dynamic properties for safe seismic landfill design.
- Assessing the seismic behavior of MBT waste is crucial for preventing landfill instability.
Purpose of the Study:
- To experimentally investigate the dynamic properties and seismic behavior of MBT waste.
- To determine the influence of different seismic waves and peak ground acceleration (PGA) on MBT waste.
Main Methods:
- Centrifuge shaking table tests were conducted on MBT waste specimens.
- Sinusoidal and Taft seismic waves were used to simulate earthquake conditions.
- Measurements included natural frequency, dynamic amplification factor, shear modulus, and excess pore water pressure (EPWP).
Main Results:
- MBT waste exhibited dilatancy under low confining pressure and a natural frequency range of 1-7 Hz.
- Dynamic amplification factor decreased with increasing PGA, while equivalent shear modulus decreased with higher PGA.
- EPWP ratio declined with burial depth, and liquefaction was not observed; EPWP increased with strain.
Conclusions:
- MBT waste demonstrates stable dynamic properties relevant for seismic landfill design.
- The study provides an empirical relationship between EPWP ratio and shear strain for MBT waste.
- Findings offer valuable data for the dynamic-stability analysis of MBT waste landfills.
