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井巷掏槽爆破中空孔效应的理论与试验分析
引用本文:刘优平,周正义,黎剑华.井巷掏槽爆破中空孔效应的理论与试验分析[J].金属矿山,2007(2):12-14.
作者姓名:刘优平  周正义  黎剑华
作者单位:南昌工程学院
摘    要:通过对含空孔掏槽爆破作用的机理分析以及对掏槽爆破中空孔的作用进行研究,从理论上得出了空孔的应力集中效应,应力集中效应随空孔直径的增加而增加;并且空孔大有利于反射拉伸波的破岩之结论.提出了用槽腔面积、循环进尺以及单位槽腔体积形成时间3个指标来评价掏槽爆破的经济技术效果,并用这些指标对不同空孔孔径的掏槽方式进行了现场对比试验分析与评价,结果表明:适当加大空孔孔径是提高巷道爆破掘进循环进尺行之有效的方法.

关 键 词:掏槽爆破  空孔效应  试验研究  井巷  掏槽爆破  空孔效应  理论与试验分析  Blasting  Tunnel  Effect  Hole  Empty  Experimental  Study  方法  爆破掘进  巷道  结果  掏槽方式  孔径  指标对  技术效果  经济  评价
收稿时间:2006-12-10
修稿时间:12 10 2006 12:00AM

Theoretical and Experimental Study on Empty Hole Effect in Tunnel Cut Blasting
Liu Youping,Zhou Zhengyi,Li Jianhua.Theoretical and Experimental Study on Empty Hole Effect in Tunnel Cut Blasting[J].Metal Mine,2007(2):12-14.
Authors:Liu Youping  Zhou Zhengyi  Li Jianhua
Institution:Nanchang Institute of Technology
Abstract:From the study of the mechanism of cut blasting with empty hole and the function of the empty hole, it is concluded theoretically that the empty hole has stress concentration effect which increases with the increase in the empty hole diameter, and the larger diameter empty hole is beneficial to the rock fragmentation by reflective stretching wave. It is proposed to use the indexes of the cut cavity area, advance per attack and forming time for unit cavity volume to assess the economic and technical performances of cut blasting. The results of making an on-site test analysis and assessment show that the proper enlargement of the empty hole diameter is an effective means to raise the advance of drifting cycle.
Keywords:Cut blasting  Empty hole effect  Experimental research
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