Blasting Damage and Energy Characteristics of Rock Mass under High <i>in-Situ</i> Stress

LIANG Rui; LI Shengrong; BAO Juan; ZHOU Wenhai

doi:10.11858/gywlxb.20220599

Volume 36 Issue 6

Dec 2022

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Chinese Journal of High Pressure Physics > 2022 > 36(6): 064202.

LIANG Rui, LI Shengrong, BAO Juan, ZHOU Wenhai. Blasting Damage and Energy Characteristics of Rock Mass under High in-Situ Stress[J]. Chinese Journal of High Pressure Physics, 2022, 36(6): 064202. doi: 10.11858/gywlxb.20220599

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LIANG Rui, LI Shengrong, BAO Juan, ZHOU Wenhai. Blasting Damage and Energy Characteristics of Rock Mass under High in-Situ Stress[J]. Chinese Journal of High Pressure Physics, 2022, 36(6): 064202. doi: 10.11858/gywlxb.20220599

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Blasting Damage and Energy Characteristics of Rock Mass under High in-Situ Stress

doi: 10.11858/gywlxb.20220599

1.
School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
2.
Key Laboratory of Western Disaster and Environmental Mechanics, Ministry of Education, School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, Gansu, China

Received Date: 30 May 2022
Rev Recd Date: 28 Jun 2022

Available Online: 15 Nov 2022

Issue Publish Date: 05 Dec 2022

Abstract

Abstract

In blasting excavation of deep rock mass engineering, the blasting effect is closely related to ground stress. Based on the rock mass-air fluid-solid coupling model, the blasting damage effect of rock mass under different in-situ stress and lateral pressure coefficient, and the variation rule of energy and peak particle velocity (PPV) threshold at inelastic boundary of rock mass were studied by combining theoretical analysis and LS-DYNA finite element numerical simulation. The results show that the damage range and crack propagation of rock mass are restrained by in-situ stress to a certain extent. The larger the in-situ stress is, the smaller the damage range and crack length will be. Under different ground stresses, the energy difference between the inelastic zone and the elastic zone decreases with the increase of the lateral pressure coefficient. When the lateral pressure coefficient is constant, the energy increases with the increase of ground stress. Under the condition of high in-situ stress, it is inaccurate to use the PPV threshold to determine the safety control of rock blasting.
- in-situ stress,
- peak particle velocity,
- fluid-structure interaction,
- blasting effect,
- damage area

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References(29)

References

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Blasting Damage and Energy Characteristics of Rock Mass under High in-Situ Stress

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