Discrete Element Simulation of Blasting Damage Characteristics of Granite under Different Decoupling Coefficients

YUAN Zengsen; XU Zhenyang; PAN Bo; LI Guangshang

doi:10.11858/gywlxb.20210804

Volume 36 Issue 1

Jan 2022

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Chinese Journal of High Pressure Physics > 2022 > 36(1): 015301.

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YUAN Zengsen, XU Zhenyang, PAN Bo, LI Guangshang. Discrete Element Simulation of Blasting Damage Characteristics of Granite under Different Decoupling Coefficients[J]. Chinese Journal of High Pressure Physics, 2022, 36(1): 015301. doi: 10.11858/gywlxb.20210804

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Discrete Element Simulation of Blasting Damage Characteristics of Granite under Different Decoupling Coefficients

doi: 10.11858/gywlxb.20210804

1.
School of Mining Engineering, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China
2.
School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received Date: 28 May 2021
Rev Recd Date: 23 Jun 2021

Abstract

Abstract

In order to study the effect of charge decoupling coefficients on the extent of granite blasting damage, a particle flow code (PFC) blasting simulation method with mixed “dynamic” and “quasi-static” loads is proposed based on the joint action of blast shock wave and detonation gas, and then the numerical simulation of granite blasting process under six decoupling coefficients was carried out. The results show that the extent of granite blasting damage increases and then decreases as the decoupling coefficients increases; the number of blasting induced cracks under coupled charge is 9367, which increases to 24975 when the decoupling coefficient is 1.2, and then decreases to 292 when the decoupling coefficient is 2.0. Comparing to the damage pattern under coupled charge, the extension distance of blasting induced crack is obviously shorter when the decoupling coefficient is 1.4, which indicates that the quasi-static pressure of blast gas plays an important role in crack extension. According to the number of blasting cracks, the prediction model of rock blasting damage under different decoupling coefficients greater than or equal to 1.2 was established, and the fitting degree reaches 0.9808. The prediction model presented in this paper is of certain reference significance for practical blasting design.
- granite,
- decoupling coefficient,
- explosion damage,
- crack,
- particle flow code

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Discrete Element Simulation of Blasting Damage Characteristics of Granite under Different Decoupling Coefficients

doi: 10.11858/gywlxb.20210804

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Discrete Element Simulation of Blasting Damage Characteristics of Granite under Different Decoupling Coefficients

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