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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 12    December 2020

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Strength and deformation behaviors of cemented tailings backfill under triaxial compression
XU Wen-bin(徐文彬)1, 2, LIU Bin(刘斌)1, WU Wei-lü(吴蔚律)1

1. School of Energy and Mining Engineering, China University of Mining and Technology (Beijing),
Beijing 100083, China;
2. School of Resources and Environment Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China

Abstract:It is of great significance for safety reason to obtain the triaxial compressive properties of cemented tailings backfill(CTB). The influence of cement content, curing age and confining pressure on strength and deformation properties of CTB was examined and discussed. Results indicate that the triaxial compressive and deformation behavior of CTB is strongly affected by the cement content, curing age and confining pressure. The increase in cement content, curing age and confining pressure leads to a change in stress-strain behavior and an increase in the axial strain at failure and post-peak strength loss. The cohesion of CTB rises as the curing age and cement content increase. However, the enhancement in internal friction angle is trivial and negligible. It should be noted that the failure pattern of CTB samples in triaxial compression is mainly along a shear plane, the confining pressure restrains the lateral expansion and the bulging failure pattern is dominantly detected in CTB samples as curing age length and cement content increase. The results will help to better understand the triaxial mechanical and deformation behavior of CTB.

 

Key words: cemented tailings backfill; triaxial compressive strength; volumetric strain; elastic modulus; cohesion; friction angle

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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