| Autor: |
Gou, Yonggang, Shi, Lizhen, Huo, Xiaofeng, Yu, Zhi, Chen, Yumin |
| Předmět: |
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| Zdroj: |
Rock Mechanics & Rock Engineering; Dec2024, Vol. 57 Issue 12, p10283-10306, 24p |
| Abstrakt: |
Evaluation of ground motion induced by underground blasting is a growing concern due to increased mining of large underground deposits. A numerical analysis is first conducted on the wave propagation characteristics, taking into account geological conditions and ground topography, and it is compared to that resulting from open-pit blasts. Then systemic experiments are conducted at two ore blocks in an underground mine. Predictions are made for peak particle velocity (PPV), frequency, and their combination for ground motions, which are then compared to inside rock vibrations induced by the same ore block blasts. Due to traditional inadequate prediction, the response spectral analysis and the normalized pseudo velocity response spectra (NPVRS) are employed to create a novel approach for illustrating ground motions. The results of numerical calculation and experimental analysis allow for the following conclusions: the wave propagation induced by underground blasting along the ground surface is more complex than that from open-pit blasts; the effect of charge weight on ground vibration decreases with a power factor (n) in the scaling attenuation equation lower than 1/3, as opposed to the typically acceptance of n being 1/2 for open-pit blasts and 1/3 for inside rock vibration induced by underground blasting; the frequency significantly drops from inside rock to ground surface; the NPVRS is a reasonable indicator for quantifying ground motions at specific positions with connecting structural responses, the relative displacement in the concerning frequency range of 5–20 Hz is linearly proportional to ground peak amplitudes. Highlights: A systematic experimental work on surface ground motion induced by underground blasting Comparison of inside rock and ground vibration from underground blasting Decreasing effect of charge weight on ground vibration induced by underground blasting Normalized pseudo velocity response spectra (NPVRS) can be simplified as the same at a specific position for effectively predicting ground vibrations [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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