Energy dissipation and 3d fracturing of Backfill-encased-rock under triaxial compression

Xin Yu, Weidong Song, Yuye Tan, John Kemeny, Jie Wang

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

The cooperation of the backfill with rock is an essential project for underground mine, especially in the room-and-pillar filling mining method. This paper discussed the relationship between the strain energy, volume fraction (VF), confining pressure, failure mode of the Backfill-encased-rock (BR) through triaxial compression test, acoustic emission (AE), and microscopic tomography (CT). The findings show the positive correlation between total strain energy, elastic energy, and two factors (VF and confinement). The internal crack progress of BR is complicated and can be divided into two parts: conjugate shear in the top 38 mm and axial splitting in the lower part. Under 0.3 MPa, less shear and more tension occurred causing the dissipated energy at peak to decrease as VF increased. The outcome could be a useful reference for future rock-backfill structure optimization in mining design.

Original languageEnglish (US)
Article number127877
JournalConstruction and Building Materials
Volume341
DOIs
StatePublished - Jul 25 2022
Externally publishedYes

Keywords

  • Backfill-encased-rock composite
  • CT scan
  • Energy dissipation
  • Fracture
  • Triaxial compression

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • General Materials Science

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