TY - JOUR
T1 - Energy dissipation and 3d fracturing of Backfill-encased-rock under triaxial compression
AU - Yu, Xin
AU - Song, Weidong
AU - Tan, Yuye
AU - Kemeny, John
AU - Wang, Jie
N1 - Funding Information:
This work was funded by the National Natural Science Foundation of China [52004019, 51974012], the China Postdoctoral Science Foundation [2021M690-361], the Fundamental Research Funds for the Central Universities [FRF-BD-20-03A], and the China Scholarship Council [201906460047].
Publisher Copyright:
© 2022
PY - 2022/7/25
Y1 - 2022/7/25
N2 - 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.
AB - 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.
KW - Backfill-encased-rock composite
KW - CT scan
KW - Energy dissipation
KW - Fracture
KW - Triaxial compression
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U2 - 10.1016/j.conbuildmat.2022.127877
DO - 10.1016/j.conbuildmat.2022.127877
M3 - Article
AN - SCOPUS:85133926630
SN - 0950-0618
VL - 341
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 127877
ER -