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One-Dimensional Consolidation Parameters Of Cemented Paste Backfills

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Yilmaz, Erol, Belem, Tikou et Benzaazoua, Mostafa (2012). One-Dimensional Consolidation Parameters Of Cemented Paste Backfills. Gospodarka Surowcami Mineralnymi - Mineral Resources Management , 28 (4). p. 29-45. doi:10.2478/v10269-012-0030-2 Repéré dans Depositum à https://depositum.uqat.ca/id/eprint/1009

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Résumé

Each year, mine and mill operations generate enormous amounts oftwo waste types – fine-grained tailings and coarse-grained waste rocks. Fine-grained tailings are either discharged in slurry form to surface tailings dams or delivered in cementitious form to underground mine stopes as backfilling, while coarse-grained rocks are typically stored by depositing as a dry material in large dumps. The engineering design of surface tailings dams or underground mine stopes is often controlled by the high compressibility and low shear strength characteristics of fine-grained tailings. Cemented paste backfill CPB indicating saturated, fine-grained backfills can undergo major consolidation settlement during early curing stages. Thus, a better understanding ofthe rate and magnitude ofboth differential and total settlement ofCPB cured under stress is essential for a proper backfill geotechnical design. The consolidation parameters of CPB can be determined from an improved lab setup called CUAPS (curing under applied pressure system). This setup is capable of simulating the CPB placement and curing conditions, and measuring the consolidation parameters of CPB cured under effective stresses ranging between 0.5 and 400 kPa. In this study, a series of one-dimensional consolidation tests were conducted on CPB samples allowing for examination of the effects of binder type and rate as well as curing time on the compression properties (e.g., coefficient of consolidation cv, compression index Cc, and recompression index Cr) and the final geotechnical index properties (e.g., void ratio ef, water content wf, and degree ofsaturation Sf). Results showed that as the binder content increases, the initial resistance to consolidation increases. The cv value decreases over the course of time due to evolution of the CPB microstructure generated by the hydration process.

Type de document: Article
Informations complémentaires: Licence d'utilisation : CC-BY-NC-ND
Mots-clés libres: Tailings; coefficient of consolidation; compression index; binder content; curing age
Divisions: Mines et eaux souterraines
Date de dépôt: 01 avr. 2020 16:46
Dernière modification: 28 mai 2020 18:08
URI: https://depositum.uqat.ca/id/eprint/1009

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