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Random Property of Ground Vertical Vibration Velocity Induced by Near Ground Explosion Seismic Effect

LIN Da chao 1,ZHANG QI 1,2 ,BAI Chun hua 1 (1.National Key Lab of Prevention and Control of Explosion Disaster,Beijing 100081,China; 2.School of Mechatronic Engineering,Beijing Institute of Technology,Beijing 100081,China)  
A general method to describe the ground velocity induced by explosion seismic is introduced,which resolves the velocity into a product of a determined amplitude attenuation function and a random response function.A brief analysis is presented on the measurements of the random velocity fluctuation caused by the near ground explosion seismic effect.The analyses of the experimental results show that the log log power spectrum of the random velocity fluctuation follows the linear relation with the spectral exponent between 2.51~2.85 within the frequency range 10~700Hz approximately,and then an evolutionary power spectrum equation of the non stationary ground vibration velocity is yielded.Otherwise,the theoretical modeling results of the ground vertical velocity are obtained,which agree with the experimental results statistically.
【Fund】: 国家自然科学基金项目 !(19972 0 13)
【CateGory Index】: TB123
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