Influence of Blasting-Induced Vibration on Slopes’ Stability

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Influence of Blasting-Induced Vibration on Slopes’ Stability Introduction Slope stability is the potential of slopes to withstand and undergo movement. The balance of shear stress and shear strength determines the stability. A previously stable slope may be initially affected by preparatory factors, making the slope conditionally unstable. Triggering factors of a slope failure can be climatic events can then make a slope actively unstable, leading to mass movements. Mass movements can be caused by increases in shear stress, such as loading, lateral pressure, and transient forces. Alternatively, shear strength may be decreased by weathering, changes in pore water pressure, and organic material. This paper presents a review of different parameters of slope’s stability under blasting-induced vibration. Similarity of blasting vibrations to earthquake motions has produced a predictable transfer of analytical techniques from earthquake engineering. This transfer allows quantifying the influence of blasting waves on the rock mass of the slope and on soil slopes. In this paper, the effects of waves’ frequency and Rayleigh’s surface waves are discussed as well as the slope characteristics such as its rock mass. Transfer of Analytical Techniques from Earthquake Engineering The similarity between blasting vibrations and earthquake motions is known. A simple example is the use of blasting-induced vibrations in experiments built to predict earthquake response of a building structure. According to Dowding (1988) two levels of analysis can be considered. The first level of analysis (pseudo-static) involves the addition to the sliding mass of an inertial force that is equivalent to the anticipated acceleration times the mass. The next level considers the slope as a rigid block that slides in response to the base motion. Both these traditional analytical techniques have

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