Dynamic response and energy dissipating characteristics of shale under cyclic impact loadings

WANG Yu; ZHAI Cheng; TANG Wei; SHI Kelong

doi:10.11883/bzycj-2022-0248

Volume 43 Issue 6

Jun. 2023

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WANG Yu, ZHAI Cheng, TANG Wei, SHI Kelong. Dynamic response and energy dissipating characteristics of shale under cyclic impact loadings[J]. Explosion And Shock Waves, 2023, 43(6): 063102. doi: 10.11883/bzycj-2022-0248

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WANG Yu, ZHAI Cheng, TANG Wei, SHI Kelong. Dynamic response and energy dissipating characteristics of shale under cyclic impact loadings[J]. Explosion And Shock Waves, 2023, 43(6): 063102. doi: 10.11883/bzycj-2022-0248

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Dynamic response and energy dissipating characteristics of shale under cyclic impact loadings

doi: 10.11883/bzycj-2022-0248

WANG Yu^{1, 2
,},
ZHAI Cheng^{1, 2
,
,},
TANG Wei^{1, 2},
SHI Kelong^{1, 2}

1.
School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
2.
National Engineering Research Center for Coal Gas Control, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China

Received Date: 2022-06-07
Rev Recd Date: 2022-09-13

Available Online: 2022-09-14

Publish Date: 2023-06-05

Abstract

Abstract

The formation of complex fracture networks in the shale subjected to cyclic impact loading is an important scientific problem for water-free fracturing technologies of shale reservoirs, such as explosive fracturing and high-energy gas fracturing. Two cyclic impact experiments based on a split Hopkinson pressure bar (SHPB) system were conducted on the freshly exposed black mud shale taken from the Wufeng Formation-Longmaxi Formation in Changning County, Sichuan Province, to investigate the kinetic response and damage evolution characteristics of the shale under different cyclic impact gas pressure and different cyclic impact gas pressure gradients, respectively, and to reveal the energy evolution law of the cyclic impact shale using different impact gas pressure gradients under the condition of controlling the constant total incident energy. The main conclusions are as follows. With the increase in impact pressure, the number of impacts required to rupture the specimen decreases, and the fragmentation and peak stress increase. The specimen undergoes cyclic impact showing the mechanical response characteristics of compaction first and then gradual damage. The damage degree of the shale specimens during cyclic impact was calculated by a dynamic damage model based on the Weibull distribution, and the results show that the damage of the specimen gradually changes from slow deterioration to sudden damage by increasing the cyclic impact pressure. Different cyclic impact experiments with different impact gas pressure gradients were conducted. The results show that under the condition of constant total incident energy, different cyclic incident energy gradients could produce different damage effects, and the energy absorption ratio of the negative or positive gas pressure gradient of cycle impact is greater than that of the zero ones. The absolute value of the pressure gradient shows a positive correlation with the energy absorption ratio. It indicates that under the condition of constant total impact energy, increasing the absolute value of the cyclic impact gradient can produce a better damage effect. The findings of the shale cyclic impact experiments can provide theoretical support for the technological design of multi-stage pulsed high-energy-gas-fracturing.
- shale,
- SHPB experiment,
- cyclic dynamic loading,
- damage evolution

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References(32)

References

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