Non-linear Dynamic Analysis of Structures on Opencast Backfilled Mine Due to Blast Vibration

摘要

The structures nearby mining area are generally subjected to blast-induced ground vibration. Thus, this is imperative to understand the behaviour of such structures through numerical analysis as an experimental study would be expensive and time consuming. Hence, this paper presents a three-dimensional non-linear finite element analysis of a two-storey reinforced concrete (RC) frame structures. Global responses in terms of storey displacements, drifts as well as local responses in terms of stress and strain of concrete at each floor level are extracted and discussed. It is observed from storey drift that there is an excessive deformation of structures and it exceeds the permissible limit. Moreover, through the analysis of strain data, it is observed that the structures already reach its plastic limit zone. Therefore, the structures will collapse due to normal gravity-based design of structures. Blast-resistant design and detailing criteria should be kept in mind when designing such structures in mine regions. In future, efforts will be driven to find out the safe permissible distance of residential structures in mining areas.