Damage patterns of surrounding rock under high-stress conditions in smooth blasting

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (6) : 104-112.

SHOCK AND EXPLOSION

Damage patterns of surrounding rock under high-stress conditions in smooth blasting

HUANG Yonghui1，ZHAN Yufei1，ZHANG Hongbo*1，LI Qinglin2，RUAN Xun3

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Abstract

In the process of deep tunnel excavation, where extremely high in-situ stress is present, a numerical simulation method based on ANSYS/LS-DYNA software was used to study the effect of in-situ stress on surrounding rock damage caused by smooth blasting. A 3D simulation was conducted using the Structured Mesh-Finite Element-Particle Flow Coupling Algorithm (S-FEM-SPH). The study investigates the damage patterns of surrounding rock under bi-directional equivalent in-situ stress conditions ranging from 0 MPa to 40 MPa. The results indicate that the damage to the surrounding rock at the sidewalls and roof can be categorized into two phases based on the change in the distance from the blast center: a horizontal linear phase and a descending phase characterized by an inverse "S" curve. In the descending phase of the inverse "S" curve, the surrounding rock at the middle distance from the blast center shows a greater rate of damage reduction as the distance decreases. In-situ stress affects the damage to the surrounding rock at both the sidewalls and the roof, with the impact on the sidewalls being more significant than that on the roof, especially when the in-situ stress exceeds 20 MPa. By comparing the changes in effective plastic strain and the depth of surrounding rock damage at the sidewalls and roof with varying in-situ stress, the study confirms the validity of the finding that the depth of surrounding rock damage decreases initially and then increases with the rise in in-situ stress.

Key words

Numerical Simulation / Smooth Blasting / Extremely High In-situ Stress / Surrounding Rock Damage / S-FEM-SPH Algorithm

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HUANG Yonghui1, ZHAN Yufei1, ZHANG Hongbo1, LI Qinglin2, RUAN Xun3. Damage patterns of surrounding rock under high-stress conditions in smooth blasting[J]. Journal of Vibration and Shock, 2025, 44(6): 104-112

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