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摘要:
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炸药爆炸产生的爆生裂缝是由爆炸应力波和爆生气体共同作用的结果。文中运用炸药爆炸的应力波理论,计算初始裂纹的长度;然后按照岩石的脆断理论计算爆生裂缝的最终扩展长度,对预裂爆破中爆炸作用过程和裂缝的扩展机理进行分析。同时还讨论了预裂炮孔间距的设计方法,认为在炮孔间距设计时,应考虑原生裂缝的存在。
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Cracks produced in blasting, is the outcome of both blasting stress wave and blasting gas. In this paper, thestress wave theory of blasting is used to discuss cracking mechanism in pre-split blasting. Firstly the initial cracklength is calculated according to the stress wave theory: then, the ultimate cracking length caused by blasting is got bythe brittle fracture theory of rock. Also design method of blasthole spacing in pre-splitting blasting is discussed, andthe writers hold that primary fractures should be considered in process of hole-spacing design.
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参考文献:
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[1]A V Dyskin,A N Galybin.Fracture mechanism of pre-split blasting[A].7th International Symposiumon Structural Failureand Plas-ticity[C].Melbourne,Australia,2000.
[2]王文龙.钻眼爆破[M].北京:煤炭工业出版社,1984.178.
[3]Hoek E,Brown E T,著.岩石地下工程[M]连志升,等译北京:..冶金工业出版社,1986.107-125.
[4]哈努卡耶夫AV,著.矿岩爆破物理过程[M].刘殿中,译.冶金工业出版社,1980.
[5]Ding Dexin,Zhu Chengzhong.Estimating the amount of explosives for notched borehole blasting[J].Trans of N.M.S.China,1993,3(2).
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