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《岩石力学与岩土工程学报(英文版)》 2018-05
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Blast-induced rock damage control in Fangchenggang nuclear power station, China

Yongqing Zeng;Haibo Li;Xiang Xia;Bo Liu;Hong Zuo;Jinlin Jiang;State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
In the process of blasting excavation, stress wave propagation and gas expansion can basically induce damage to surrounding rocks, which is detrimental to rock mass integrity and engineering safety. In this case, evaluation and control of blast-induced effects are essential to the safety of nearby buildings and integrity of bedrock in blasting field. In Fangchenggang nuclear power station of China, the drill-andblast method was employed for bedrock excavation. In order to reduce the blast-induced damage zone, the wave propagation and associated damage to rock mass should be carefully investigated. In this paper, the wave propagation regressively obtained from field monitoring data was presented based on empirical formula(e.g. Sadovsky formula). The relationship between the peak particle velocity(PPV) at a distance of 30 m away from the charge hole and charge per delay in blast design was derived. Meanwhile,the acoustic tests before and after blasting were conducted to determine the damage depth of rock mass.The charge per delay in blast design was then calibrated based on the blast-induced wave propagation regularity. The results showed that a satisfactory effect was achieved on blast-induced damage control of rock mass. This could be helpful to rock damage control in similar blasting projects.
【Fund】: supported by the Key Program of National Natural Science Foundation of China(Grant No.51439008);; National Natural Science Foundation of China(Grant Nos.41572307 and51779248);; National Natural Science Funds for Distinguished Young Scholar of China(Grant No.41525009)
【CateGory Index】: TU45;TM623
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