The open-pit mining slopes continue to become higher and steeper with the continuous exploitation of near-surface mineral resources. The blasting excavation exerts a significance influence on the slope stability. In fact, intact rock slopes do not exist and slope stability is controlled by the geological defects. In this paper, the stability of a rock slope imbedded with a fault is considered. The P-wave component of blasting seismic waves is focused on and the fault is simplified as a semi-infinite crack. In background of Daye iron mine, the peak particle velocity (PPV) threshold is determined based on the linear elastic fracture dynamics. The influence of frequency, Young's modulus, and Poisson's ratio is studied to modify the PPV threshold. Results show that (1) the PPV threshold decreases with the increasing Young's modulus and Poisson's ratio, but increases with the increasing frequency; (2) the initiation angle is immune to Young's modulus and the frequency, and only depends on the Poisson's ratio; (3) the PPV criterion is finally determined as 1.47 cm/s when the frequency f ≤ 10 Hz, 1.47 cm/s–3.30 cm/s when 10 Hz < f ≤ 50 Hz and 3.37 cm/s–6.59 cm/s when f > 50 Hz, which are far less than that of intact rock slopes; (4) The north slope is quite safe if the proposed PPV threshold is not violated due to the variation range of the initiation angle θ₀.

中文翻译：

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爆破P波作用下嵌有断层的岩石边坡的PPV准则

随着近地表矿物资源的不断开采，露天采矿边坡继续变得越来越高和越来越陡峭。爆破开挖对边坡的稳定性有重要影响。实际上，不存在完整的岩石边坡，边坡稳定性由地质缺陷控制。在本文中，考虑了嵌有断层的岩石边坡的稳定性。关注爆破地震波的P波分量，将断层简化为半无限裂纹。在大冶铁矿的背景中，基于线性弹性断裂动力学确定峰值粒子速度（PPV）阈值。研究了频率，杨氏模量和泊松比的影响以修改PPV阈值。结果表明：（1）PPV阈值随Young'的增加而降低。模数和泊松比，但随着频率增加而增加；（2）起始角不受杨氏模量和频率的影响，仅取决于泊松比；（3）当频率为PPV时，最终确定为1.47 cm / s˚F  ≤10赫兹，1.47厘米/秒-3.30厘米/秒时10赫兹<  ˚F  ≤50赫兹和3.37厘米/ S-6.59厘米/秒时˚F  > 50 Hz，这是比完整岩石的山坡的少得多; （4）北坡是相当安全的，如果所提出的PPV阈值不违反由于起始角度的变化范围θ ₀。