Attenuation law of PPV in high crustal stress tunnels under blasting load

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (23) : 260-266.

QIAO Guodong1，2,LIU Zegong1,2,GAO Kui1,FU Shigui1，2,ZHANG Jianyu1，2， LIU Huaju3

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Abstract

In this paper, the Huainan Pan San Mine overrun pre-cracking blasting disturbed gas synthesis lane was used as the engineering background. Numerical simulation software ANSYS/LS-DYNA was used to investigate the PPV attenuation pattern of the roadway envelope under different in-situ stresses. A combination of theoretical analysis and numerical simulation was used to provide an interpretation of the relationship between in-situ stress and PPV in terms of dynamic stress and vibration energy. The results show that the PPV decays exponentially with increasing blast core distance; the higher the in-situ stress, the smaller the PPV and the slower the decay rate at the same blast core distance; as the blast core distance increases, the suppression effect of in-situ stress on PPV decreases; due to the reflection superposition effect of blast stress waves, the PPV decay curve of the perimeter rock on the blast side of the tunnel fluctuates repeatedly, with a maximum peak at the free face. The PPV decay curve on the blast side still follows the rule that the higher the in-situ stress, the smaller the PPV. The results of the study are of great significance to the design optimization of deep high in-situ stress blasting operations and the research on the safety criteria of deep shaft blasting vibration and the dynamic response characteristics of structures.

Key words

in-situ stress / blasting safety / peak particle velocity (PPV) / vibration velocity attenuation

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QIAO Guodong1，2,LIU Zegong1,2,GAO Kui1,FU Shigui1，2,ZHANG Jianyu1，2， LIU Huaju3. Attenuation law of PPV in high crustal stress tunnels under blasting load[J]. Journal of Vibration and Shock, 2023, 42(23): 260-266

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