Abstract
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.
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