Objective
The most common types of blasting damage are caused by ground vibration. The sudden acceleration of the rock by the detonation gas pressure acting on the drillhole 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.

Methods
The stability of slopes subject to ground vibration, which is induced by rock blasting, may be assessed by different approaches. In this paper, two approaches of the Pseudo-static Approach and Dynamic Analysis Approach are discussed. In both approaches, analysis of the dynamic response of slopes to the bedrock vibration in association with the calculation of the allowable vibration limits (i.e. critical peak particle velocity) and charge weight per delay is presented. Worked example is given to illustrate the use of the method.

Results and Conclusions
The allowable charge weights per delay for rock blasting which may impact on the stability of slopes can be estimated using simple approaches, either the Pseudo-static Approach or Dynamic Analysis. Both approaches can give a controllable safety limits for the works. The blasting works can be carried out safely with no damage or excessive movements to the slopes and other sensitive receivers if the allowable peak particle velocity and charge weights are followed, and the specified monitoring works are carried out.