Non-linear Dynamic Analysis of Structures on Opencast Backfilled Mine Due to Blast Vibration
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.
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Abstract 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.
1 Introduction The activity of coal extraction is inevitable due to the rapid increase in population and its energy demand. Blasting is a very common activity in the coal industry for the removal of overburden. This, in particular, helps in efficient extraction of coal.
S. Kumar (B) · S. C. Dutta · S. D. Adhikary · M. A. Hussain Indian Institute of Technology (ISM), Dhanbad, India e-mail: [email protected] S. C. Dutta e-mail: [email protected] S. D. Adhikary e-mail: [email protected] M. A. Hussain e-mail: [email protected] © Springer Nature Singapore Pte Ltd. 2021 S. Dutta et al. (eds.), Advances in Structural Vibration, Lecture Notes in Mechanical Engineering, https://doi.org/10.1007/978-981-15-5862-7_9
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Explosives are loaded into the drilled holes and are further detonated. The detonation leads to the release of energy and a portion of the energy is converted into wave energy with compression waves, shear waves and Rayleigh waves transmitted in all the direction from blast source. Rayleigh wave receives the maximum percentage of energy and causes the most destruction as they travel along the surface. Vibration energy that travels beyond the zone of rock breakage causes damage to surface structure and annoyance to the resident in the vicinity of mine areas. Completion of excavation work without endangering the safety of the surrounding structures is of great concern to all. Ground vibration is mainly influenced by parameters like distance between the blast and observation points, geological characteristics properties of the rock mass and nature of explosives [1, 2]. Two very important parameters that characterize the blast-induced ground vibration is peak particle velocity (PPV) and frequency. The damage potential due to blast vibration is generally qualified in terms of only PPV [3–7]. Thus, forecasting the level of ground vibration at differe
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