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Investigation of Numerical Method of the Vibration Response of Underground Structure

JIN Jing1,SHANG Xiao-jiang2,DING Hua1(1.Institute of Mechanics,Chinese Academy of Sciences,Beijing 100080,China;2.Institute of Structure,Chinese Academy of Building Research,Beijing 100013, China)  
With the help of rapidly developed computer technology,the numerical simulation has become an important research tool in simulating blasting processes in various medium and their near-field wave effects.Against one of the important application subjects of blasting technique in engineering,the vibration and response of underground structure under blasting load conditions were studied numerically.By analyzing an equivalent source model for the blasting vibrations of a fragmenting blasting,it may be seen that the model proposed in this paper reflects the main physical characteristics of the blasting vibrating processes,and it is simple and easy to implement in applications.By using the equivalent source model,vibration process of underground structure under blasting load conditions was realized in FEM for the purpose of numerical simulation.Transient disturbance and propagation characteristic,such as frequency characteristic and amplitude change rule were analyzed and compared with the experimental data.It explains the near-field explosion phenomenon and provides theoretical gist for experiments.The numerical simulation of in situ experiments verifies the validity of the method and provides good base for future work.
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