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Spatial acoustic emission evolution of red sandstone during multi-stage triaxial deformation

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Abstract

Multi-stage triaxial compression tests for cylindrical red sandstone specimens (diameter of 50 mm, height of 100 mm) were carried out with a rock mechanics testing system and spatial acoustic emission (AE) locations were obtained by adopting an AE monitoring system. Based on spatial AE distribution evolution of red sandstone during multi-stage triaxial deformation, the relation between spatial AE events and triaxial deformation of red sandstone was analyzed. The results show that before peak strength, the spatial AE events are not active and distribute stochastically in the specimen, while after peak strength, the spatial AE events are very active and focus on a local region beyond final microscopic failure plane. During multi-stage triaxial deformation with five different confining pressures, the spatial AE distribution evolution in the red sandstone was obtained. The obtained spatial AE locations of red sandstone at the final confining pressure agree very well with the ultimate failure experimental mode. Finally, the influence of confining pressure on the spatial AE evolution characteristics of red sandstone during triaxial deformation was discussed. The AE behavior of red sandstone during multi-stage triaxial deformation is interpreted in the light of the Kaiser effect, which has a significant meaning for predicting the unstable failure of engineering rock mass.

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Authors and Affiliations

  1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221008, China

    Sheng-qi Yang  (杨圣奇), Hong-mei Ni  (倪红梅) & Sen Wen  (温森)

Authors
  1. Sheng-qi Yang  (杨圣奇)
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  2. Hong-mei Ni  (倪红梅)
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  3. Sen Wen  (温森)
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Corresponding author

Correspondence to Sheng-qi Yang  (杨圣奇).

Additional information

Foundation item: Project(2014CB046905) supported by the National Basic Research Program of China; Project(2014YC10) supported by the Fundamental Research Funds for the Central Universities, China

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Yang, Sq., Ni, Hm. & Wen, S. Spatial acoustic emission evolution of red sandstone during multi-stage triaxial deformation. J. Cent. South Univ. 21, 3316–3326 (2014). https://doi.org/10.1007/s11771-014-2305-9

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  • DOI: https://doi.org/10.1007/s11771-014-2305-9

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