Directional pre-splitting of roadway roof based on the theory of bilateral cumulative tensile explosion

HE Manchao; GUO Pengfei; ZHANG Xiaohu; WANG Jiong

doi:10.11883/bzycj-2016-0359

Volume 38 Issue 4

May 2018

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HE Manchao, GUO Pengfei, ZHANG Xiaohu, WANG Jiong. Directional pre-splitting of roadway roof based on the theory of bilateral cumulative tensile explosion[J]. Explosion And Shock Waves, 2018, 38(4): 795-803. doi: 10.11883/bzycj-2016-0359

Citation:

HE Manchao, GUO Pengfei, ZHANG Xiaohu, WANG Jiong. Directional pre-splitting of roadway roof based on the theory of bilateral cumulative tensile explosion[J]. Explosion And Shock Waves, 2018, 38(4): 795-803. doi: 10.11883/bzycj-2016-0359

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Directional pre-splitting of roadway roof based on the theory of bilateral cumulative tensile explosion

doi: 10.11883/bzycj-2016-0359

HE Manchao^{1, 2},
GUO Pengfei^{1, 2
,
,},
ZHANG Xiaohu^{1, 2},
WANG Jiong¹

1.
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, China
2.
Institute of Geotechnical Engineering, China University of Mining and Technology, Beijing 100083, China

Received Date: 2016-11-29
Rev Recd Date: 2017-03-13
Publish Date: 2018-07-25

Abstract

Abstract

To obtain the optimal pre-splitting hole spacing in a retained gob-side entry formed by roof cutting and pressure releasing, we investigated the directional pre-splitting of the roadway roof under bilateral cumulative tensile explosion using the LS-DYNA software and field test. The numerical results showed that the effective tension stress was generated after the stress wave superposition when the hole spacing was 400 mm; that when the hole spacing was 500 mm, the effective tension stress was also higher than the tensile strength of the hole wall rock, thus forming the cracks in the hole wall rock along the direction of cumulative energy and expanding the cracks between the adjacent holes; and that when the hole spacing was 600 mm, the cracks between the adjacent holes failed to form because the hole spacing was too large to generate the effective tension stress. The field tests showed that continuous cracks were formed from the hole bottom to porthole in the blasting-free holes when the hole spacing was 400 or 500 mm and the crack length reached 2.4 m, forming a continuous cutting surface and effectively restraining the displacement of roof and floor and the roof pressure along the roadway in the gob-side entry. Out study concluded that the interval blasting with a 500 mm hole spacing was the optimal design in the three tests under different hole-spacing conditions.
- bilateral cumulative tensile explosion,
- roof cut and pressure releasing,
- directional pre-splitting,
- hole spacing,
- dynamic analysis

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References

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