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Mining is an important economic activity in many parts of the world. However, extracting ore rocks produces huge quantities of potential toxic tailings (man-made soils) which can result in environmental and geotechnical problems if they are not properly managed. A novel method of tailings management; called cemented past backfill (CPB); was developed by mixing the tailings with water and binding materials (cement) to minimize the risks associated with traditional management. CPB enables to return a large amount of the mine tailings to the underground mine openings (stopes). However, it has been found that fresh CPB placed in a stope can be susceptible to several geotechnical problems, such as liquefaction under dynamic loading, which may cause injuries/fatalities and financial consequences. Many studies have evaluated the liquefaction behavior of natural soils and tailings (without cement) during seismic events using shaking table test techniques. There were few studies that evaluated CPB liquefaction during dynamic loading events using the triaxial test. However, there was no study that was performed to determine the liquefaction potential of CPB using shaking table test. Accordingly, this study aims to identify the behavior of early aged CPB (2.5 hrs. 4.0 hrs, and 10.0 hrs) during seismic loading using shaking table tests. The results of this research show that CPB samples cured to 2.5 hrs are susceptible to liquefaction under the studied seismic loading conditions, while CPB samples cured to 4.0 and 10.0 hrs were resistant to liquefaction. The findings in this research will contribute to more cost-effective design of CPB structures.
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