Abstract
As a common disaster in deep-buried hard rock engineering projects, rock-bursts seriously threaten the safety of workers and facilities. Water infusion in rock mass before excavation is usually used for rock-burst prevention. To reveal the underlying mechanism of rock watering for rock-burst inhibition, a series of uniaxial compression tests were carried out on sandstone samples with different water contents. The effects of water content on energy evolution characteristics (i.e., energy partition and energy release) were analyzed during loading process. In addition, a new rock-burst proneness criterion in terms of the release rate of post-peak energy was proposed to effectively evaluate the rock-burst proneness of water-bearing sandstone. The rock-burst proneness of samples with various water contents was calculated and compared. The experimental results have shown that with the increase of water content, the pre-peak strain energy density, elastic energy density, and dissipated energy density are decreased to some extents, as well as the rock-burst proneness. The water-induced reductions of the pre-peak elastic energy and the energy release rate during the post-peak phase collectively result in the decrease of rock-burst proneness of water-bearing sandstone.
Highlights
-
Water content significantly affects the energy partition and release of sandstone samples during uniaxial compression.
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A new rock-burst criterion based on energy release rate is proposed to evaluate the rock-burst potential of water-bearing sandstone samples.
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The rock-burst proneness of sandstone sample is gradually decreased as water content rises.
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The water-induced reduction of the elastic energy storage at pre-peak and the energy release rate at post-peak collectively lead to the declining rock-burst proneness of water-bearing sandstone.
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Abbreviations
- σ c :
-
Peak stress
- ε c :
-
Peak strain
- σ r :
-
Residual stress
- ε r :
-
Residual strain
- σ bf :
-
Burst failure stress
- E 0 :
-
Young’s modulus
- E u :
-
Unloading modulus
- U o i :
-
Strain energy density under σi stress level
- U e i :
-
Elastic energy density under σi stress level
- U d i :
-
Dissipated energy density under σi stress level
- U o :
-
Pre-peak strain energy density
- U e :
-
Pre-peak elastic energy density
- U d :
-
Pre-peak dissipated energy density
- U a :
-
Post-peak input energy density
- U f :
-
Fracture energy density
- U r :
-
Residual elastic energy density
- \(U_{{{\text{ET}}}}^{{\text{e}}}\) :
-
Elastic energy density at the 0.8σc stress level
- \(U_{{{\text{ET}}}}^{{\text{d}}}\) :
-
Dissipated energy density at the 0.8σc stress level
- A CF :
-
Energy impact index
- \(A^{\prime}_{{{\text{CF}}}}\) :
-
Peak-strength energy impact index
- PES:
-
Elastic potential energy index
- A EF :
-
Residual elastic energy index
- W ET :
-
Strain energy storage index
- V ER :
-
Energy release rate
- T R :
-
Failure time
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Acknowledgements
The work is supported by the National Natural Science Foundation of China (52104111, 41772313), the Natural Science Foundation of Hunan Province (2021JJ30819, 2020JJ7059), National Key Research and Development Program of China (2022YFC2903901), and Open Fund of State Key Laboratory of Safety Technology of Metal Mines (kfkt2023-01). The authors are very grateful to the financial contribution and convey their appreciation for supporting this basic research.
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ZZ: conceptualization; supervision; funding acquisition; writing-review and editing. PW: methodology; writing-original draft. WC: writing-review and editing. XC: methodology; testing; visualization; writing-review and editing.
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Zhou, Z., Wang, P., Cai, X. et al. Influence of Water Content on Energy Partition and Release in Rock Failure: Implications for Water-Weakening on Rock-burst Proneness. Rock Mech Rock Eng 56, 6189–6205 (2023). https://doi.org/10.1007/s00603-023-03379-z
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DOI: https://doi.org/10.1007/s00603-023-03379-z