关键词: 爆炸力学 , 地下结构 , 爆破震动 , 等效模型 , 数值模拟 , 近场爆炸

Abstract: With the help of rapidly developed computer technology, the numerical simulation has be?come 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 numer-ically. 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 blast?ing 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 exper?imental data. It explains the near-field explosion phenomenon and provides theoretical gist for experi?ments ? The numerical simulation oi m situ experiments verifies the validity of the method and provides good base for future work.

Key words: explosion mechanics , underground structure , olasting vibration , equivalent source model , numerical simulation , near-field explosion