The Compressive Behavior of Cemented Tailings Backfill under the Action of Different Curing Temperature and Age
Lizhuang Cui1, Yongyan Wang1, Zhuoqun Yu1, Yonggang Zhang2
1College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao, China
2Key Laboratory of Geotechnical and Underground Engineering, Ministry of Education and Department of Geotechnical Engineering, Tongji University, Shanghai, China
Keywords: cemented tailings backfill, curing temperature, curing age, unconfined compressive strength, microstructure
Abstract
During the backfilling mining process, the strength of backfilling body is continuously affected by the temperature. Unconfined compressive strength (UCS) tests were performed on cemented tailings backfill (CTB) samples cured at different temperatures. The results show that UCS increases linearly with the increase of curing temperature during the age of 3 to 7 days, while it shows an exponential relationship with the curing temperature during the age of 7 to 28 days and the growth rate gradually slows down. As the curing temperature and age increases, the microstructure becomes denser, meanwhile, UCS becomes more sensitive to variances in age, and the failure patterns of CTB samples change from crushing failure to tensile failure. The established formula can well describe the coupling effect of curing temperature and age on UCS, which can provide a certain reference for CTB strength design and mining.
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