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《Engineering Blasting》 2012-01
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STUDY ON RESPONSE SPECTRUM OF BLASTING VIBRATION INDUCED BY UNDERGROUND POWERHOUSES EXCAVATION

CHEN Xing-ze,YANG Xing-guo,LI Hong-tao,GAO Xing-ji,CHAI Ming-hai(College of Water Resources and Hydropower,Sichuan University,Chengdu 610065,China)  
The response of a structure in the blasting earthquake is affected by the blasting vibration and its dynamic response characteristic,which was charactered by response spectrums of blasting vibration.According to monitoring data from excavation of underground powerhouse in Xiangjiaba Hydropower Station,response spectrum of blasting vibration with different forms of explosion source,which included arch blasting,bench blasting,protective layer blasting and presplitting blasting,were analyzed and compared with response spectrums of surface bench blasting and natural earthquake.The results showed that the period of blasting vibration response spectrum with evident amplification effect was 0.002~0.01s in excavation of underground powerhouse,whose value was smaller and range was narrower than surface bench blasting and natural earthquake.
【Fund】: 国家自然科学基金资助项目(51009104);; 教育部博士点新教师基金(200806101039);; 四川省科技支撑计划(2008SZ0232)
【CateGory Index】: TB41
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