Abstract
The most common types of blasting damage are caused by ground vibration. The sudden acceleration of the rock by the detonation energy acting on the drill-hole generates an intense stress wave of both transverse and longitudinal wave motions in the surrounding rock. Key issues associated with the process of excavation and tunnelling include blast and, to a lesser extent, other construction vibration affecting the integrity of surface structures and slopes stability. The stability of slopes subject to ground vibration, which is induced by rock blasting, may be assessed by different approaches. In this paper, pseudo-static and dynamic analysis approaches are discussed. In both approaches, analysis of the dynamics response of slopes to the bedrock vibration in association with the calculation of the allowable vibration limits (ie. critical peak particle velocity (PPV)) and charge weight per delay is presented. A worked example is given to illustrate the use of the method. The allowable charge weights per delay for rock blasting that may impact on the stability of slopes can be estimated using simple approaches, either the pseudo-static or dynamic analysis. Both approaches can give a controllable safety limits for the works. Thus, the blasting works can be carried out safely with no damage or excessive ground movements to the slopes and other sensitive receivers if the allowable PPV and charge weights are followed, and the specified monitoring works are carried out.
Published Version
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