Study on the Blast Vibration Produced by Mining Activity and Safety Criteria

摘要

Drilling and blasting is performed in mines almost everyday. Ground vibrations from mine blasting may cause an environmental impact such as instability of tunnel walls or damage on adjacent structures and facilities as well as neighbor's complaints. Complaints associated with blasting have often become a target of public grievances. Efforts have been made to establish the rational safety criteria. It seems that differing cultures have often differing thresholds of the toleration of vibration, and that technical data or rational grounds for establishing the limits are hardly provided. A peak particle velocity criterion, which was suggested for urbane subway construction, has often been widely used in Korea. There is a growing tendency to adopt vibration criteria varying with respect to the frequency of the vibrations for the evaluation of the effects of blast loading on the structure. Efforts have been made to establish more rational criteria This study has been performed to provide guidelines for blasting works at mines and for establishing a more rational acceptance level of ground vibration. Collection of large amounts of scaled distance data was made to determine attenuation relationships for use in the guideline. Field measurements were carried out at underground and surface mines. The characteristics of mine blasts were analyzed using the collected blasting records. Guidelines for blast design and for acceptance level were suggested.