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Stability assessment of soil slopes subject to blasting vibrations based on time history analyses

机译：基于时程分析的爆破振动对土质边坡稳定性的评估

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Technical guidelines on using a pseudo-static method to analytically assess the stability of soil slopes subject to the effects of blasting vibrations have been implemented since the early 1990s in Hong Kong. This method, which simplifies the blasting action into an equivalent static blasting force, does not consider the dynamic nature of transient blasting waves or the frequency content that affects the soil dynamic responses. This paper presents a study of the recent technical developments of the subject and recommends a time history analysis for slope stability assessment to account for the effects of blasting vibrations. The proposed method makes use of the representative time histories of blasting vibrations of bedrock derived from the actual site monitoring data and a numerical site response analysis to assess the dynamic stability of soil slopes. It allows a refinement of the limiting peak particle velocity of slopes in a rational and practical manner. The potential of using time history analyses as an alternative, less conservative approach via the consideration of blasting frequency and energy contents is demonstrated. This advanced numerical method can be also applied elsewhere with recorded blasting monitoring.
机译：自1990年代初以来，香港已实施了使用伪静态方法来分析受爆破振动影响的土质边坡稳定性的技术准则。该方法将爆破作用简化为等效的静态爆破力，但没有考虑瞬变爆破波的动力特性或影响土壤动力响应的频率含量。本文介绍了该主题的最新技术发展，并建议进行时程分析以进行边坡稳定性评估，以考虑爆破振动的影响。所提出的方法利用了根据实际现场监测数据得出的基岩爆破振动的代表性时间历史和现场数值响应分析来评估土坡的动态稳定性。它允许以合理和实用的方式细化斜坡的极限峰值粒子速度。通过考虑爆破频率和能量含量，证明了使用时程分析作为替代，不太保守的方法的潜力。这种先进的数值方法还可以应用于记录爆破监测的其他地方。

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