Directional splitting mechanism of rock based on shaped charge jet

LIU Di; GU Yun; SUN Fei; LI Fei; CHEN Shunlu; LIU Qinjie

doi:10.11883/bzycj-2022-0496

Volume 43 Issue 8

Aug. 2023

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LIU Di, GU Yun, SUN Fei, LI Fei, CHEN Shunlu, LIU Qinjie. Directional splitting mechanism of rock based on shaped charge jet[J]. Explosion And Shock Waves, 2023, 43(8): 083303. doi: 10.11883/bzycj-2022-0496

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LIU Di, GU Yun, SUN Fei, LI Fei, CHEN Shunlu, LIU Qinjie. Directional splitting mechanism of rock based on shaped charge jet[J]. Explosion And Shock Waves, 2023, 43(8): 083303. doi: 10.11883/bzycj-2022-0496

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Directional splitting mechanism of rock based on shaped charge jet

doi: 10.11883/bzycj-2022-0496

LIU Di^1
,,
GU Yun¹,
SUN Fei^{1
,
,},
LI Fei¹,
CHEN Shunlu²,
LIU Qinjie¹

1.
Nuclear Industry Nanjing Construction Group Co., Ltd., Nanjing 211102, Jiangsu, China
2.
Junyuan Kebao Nanjing Engineering Technology Co., Ltd., Nanjing 211135, Jiangsu, China

Received Date: 2022-11-07
Rev Recd Date: 2023-03-11

Available Online: 2023-03-13

Publish Date: 2023-08-31

Abstract

Abstract

Based on the brittle fracture model of rock materials, from the perspective of improving the conversion efficiency of explosive energy to the fracture surface energy of rock materials, it is proposed to use pre-cutting and multi-point shaped charge jet impact on rocks for crack fracturing and propagation, achieving directional rock splitting. A shaped charge that can be used for rock splitting was designed, while the directional splitting mechanism of rock-like brittle materials under the impact of shaped charge jet is studied using numerical method, by which the impact splitting effects of different shapes of high-speed metal rods on rocks are calculated and compared. The formation of the shaped charge jet and the impact fracture process on the rock are analyzed by using numerical simulation, and the optimal shaped charge structure and explosion height for splitting are obtained. In the experiment, 2 shaped charges were used to successfully split the rock samples followed the design direction, and the peak stress on the rock surface obtained from the test were about 0.5−0.8 MPa. The results show that using this shaped charge can form a wedge-shaped metal rod with a length-to-diameter ratio of about 1∶3 at an explosion offset of 25 mm. The shaped charges are set at multiple points along the pre-cutting direction of the designed rock control interface, and at the same time, the wedge-shaped metal rod jets are formed after explosion, which impact the rock and produce a good directional splitting effect. This technology accurately introduces explosive energy into the control interface and converts it into rock fracture surface energy effectively, thereby improving the effective utilization rate of explosives, providing reference for the design of precise control blasting cutting devices for large-scale rock excavation and reducing blasting hazards.
- shaped charge,
- rock fracture surface energy,
- directional splitting,
- boundary control blasting

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References(20)

References

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