1 Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, 730050, PR China
2 Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou, 730050, PR China
In this study, the acceleration time-history curve of blasting vibration is obtained at different explosion distances in different amount of explosion with MATLAB analysis software to determine the dynamic response of mining blasting vibration to surrounding reinforced concrete (RC) frame structures.
Moreover, this paper discusses the dynamic response of two RC structures with different numbers of stories that happen to blasting vibration waves generated by using different amount of explosion at different blasting distances.
Results show that the vibration response of the RC frame structures may be larger under the action of blasting vibration. The smaller the explosion source distance, the lower is the structure, and the larger is the story drift, that is, in general, with the same explosion charge and small explosion source, the deformation of lower structure is larger than the higher. The larger the explosion source distance, the smaller is the change range of floor displacement. A larger distance results in a weaker blasting vibration response.
Furthermore, the acceleration amplitudes of the top stories are almost equal in both structures with the same amount of explosion and the same explosion distance. It is suggested that the higher the structure , the greater is the influence of explosion source distance on the change rate of floor displacement and story drift . Therefore, allowable safety distance should be determined according to the mining conditions and structural height during structure design.
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