Air-Decking Technique in Bench Blasting

作     者：ZHU Hong-bing LU Wen-bo WU Liang 

作者机构：Key Laboratory of Water Resource and Hydropower Engineering Science Wuhan University Wuhan Hubei 430072 China 

出 版 物：《Journal of China University of Mining and Technology》 (中国矿业大学学报（英文版）)

年 卷 期：2006年第16卷第2期

页      码：184-188页

摘      要：The mechanism and the design parameters of blasting with air-decking are studied. The theory of detonation waves is used to investigate the processes of the one-dimensional plane detonation wave within a borehole. The interac- tion of the rarefaction wave with an interface and reflection on a rigid wall is also analyzed. The same courses of the shock wave are also investigated. This decides the distribution of the pressure of the explosion products changing with time along the borehole. Based on the above theoretical analysis, two conditions should be met for a reasonable range of values of the air-decking ratio in blasting rock. First, the rarefaction wave from the contact interface between detonation products and air reaches the bottom earlier than that of the reflected shock wave from the end of the stemming. Second, the reflected shock wave reaches the contact interface between the detonation products and air earlier than that of the reflected rarefaction wave from the bottom of the borehole. Finally, the reasonable value of the air-decking ratio must be decided theoretically in air-decking blasting. For different explosives, the reasonable range of air-decking ratio varies from 0.15 to 0.4. This result is well consistent with what was obtained by previous researchers.

主 题 词：台阶式爆破 爆震波 采矿 爆破设计 

学科分类：0808[工学-自动化类] 08[工学] 0820[工学-航空航天类] 0817[工学-轻工类] 0818[工学-交通运输类] 0807[工学-电子信息类] 0815[工学-矿业类] 0827[工学-食品科学与工程类] 0813[工学-化工与制药类] 0802[工学-机械学] 0703[理学-化学类] 0814[工学-地质类] 0702[理学-物理学类] 0801[工学-力学类] 

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