The Dynamic Response Patterns of Goafs at Different Distances under Blasting Load

DOI

10.2991/978-94-6463-658-1_79How to use a DOI?

Keywords

goaf; blasting load; different distances; numerical simulation; dynamic response

Abstract

In the early stages of China’s mining industry, due to underdeveloped legal regulations, small mining companies often neglected backfilling and support work after excavation, leading to the formation of numerous goafs (mined-out areas). These goafs are prone to instability under the influence of external factors. To prevent instability in the goafs of the Baiyin Nuoer lead-zinc mine and to study the effects of blasting at different distances, numerical simulations of the dynamic response of goafs under single-hole blasting were conducted using ANSYS/LS-DYNA software under consistent burial depth conditions. The analysis results showed that the vibration velocity of the roof was significantly higher than that of the middle and floor and decreased with increasing horizontal distance, although the rate of attenuation slowed. After slight upward displacement, the roof underwent downward displacement, forming residual displacement. It is recommended to assess the stability of the roof even when blasting outside the safety distance to prevent cumulative damage leading to collapse. The stress in the roof was much higher than in other parts, and effective stress gradually decreased with increasing horizontal distance. To ensure the stability of the roof, it is advised to calculate a safe blasting distance, ensuring that the maximum tensile stress in the roof is below the rock’s ultimate tensile strength.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Shuwang Liu
AU  - Honglu Fei
PY  - 2025
DA  - 2025/03/03
TI  - The Dynamic Response Patterns of Goafs at Different Distances under Blasting Load
BT  - Proceedings of the 2024 10th International Conference on Architectural, Civil and Hydraulic Engineering (ICACHE 2024)
PB  - Atlantis Press
SP  - 767
EP  - 774
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-658-1_79
DO  - 10.2991/978-94-6463-658-1_79
ID  - Liu2025
ER  -