Effect of hydrostatic pressure on fracture of rock subjected to plasma impact

FU Rongyao; SUN Yaohong; XU Xuzhe; YAN Ping

doi:10.11883/bzycj-2017-0057

Volume 38 Issue 5

Jul. 2018

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FU Rongyao, SUN Yaohong, XU Xuzhe, YAN Ping. Effect of hydrostatic pressure on fracture of rock subjected to plasma impact[J]. Explosion And Shock Waves, 2018, 38(5): 1051-1056. doi: 10.11883/bzycj-2017-0057

Citation:

FU Rongyao, SUN Yaohong, XU Xuzhe, YAN Ping. Effect of hydrostatic pressure on fracture of rock subjected to plasma impact[J]. Explosion And Shock Waves, 2018, 38(5): 1051-1056. doi: 10.11883/bzycj-2017-0057

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Effect of hydrostatic pressure on fracture of rock subjected to plasma impact

doi: 10.11883/bzycj-2017-0057

FU Rongyao^{1, 2, 3
,},
SUN Yaohong^{1, 2, 3},
XU Xuzhe^{2, 3},
YAN Ping^{1, 2, 3}

1.
University of Chinese Academy of Sciences, Beijing 100049, China
2.
Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
3.
Key Laboratory of Power Electronics and Electric Drive, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received Date: 2017-02-22
Rev Recd Date: 2017-04-24
Publish Date: 2018-09-25

Abstract

Abstract

In order to understand the fracture law of rock by shock wave in deep water, an electric pulse fracturing device with hydrostatic pressure up to 35 MPa was established, which can simulate the confining pressure of 3 000 m underground. The experiments of plasma impact fracturing under different hydrostatic pressures were carried out. The maximum operating parameter of the fracturing device is 20 kV/40 kJ. Six sandstones were fractured by electric pulse under the hydrostatic pressure which ranges from 0 to 25 MPa. The experimental results show that the length and width of fracture decrease significantly with the increase of hydrostatic pressure under the same energy. So the destroy range of shock wave decreases and the porosity and permeability decline with the increase of confining pressure. The hydrostatic pressure has obvious influence on the formation, distribution and growth of the crack after impact fracture. Compared with the cracks formed by atmospheric pressure, cracks are concentrated in the electrode. The number of cracks is more but the length is shorter and there are different degrees of bending, even annular cracks occur in the local area.
- plasma,
- hydrostatic pressure,
- shock wave,
- pulse discharge,
- rock fracture

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References(14)

References

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