A new technology for hard-rock tunneling based on drilling and hydraulic impact breaking

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• 作者：Risheng Long^a ; ^b ; ^c ; ^{etomi@163.com" class="auth_mail" title="E-mail the corresponding author} ; Shaoni Sun^d ; Zisheng Lian^a ; ^b ; Yaoyao Liao^a ; ^b ; Xiaofeng Qin^a
• 关键词：Hydraulic impact breaking ; Hard rock tunneling ; Breaking mechanism ; Numerical simulation ; Technology research
• 刊名：International Journal of Mining Science and Technology
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：25
• 期：6
• 页码：1053-1058
• 全文大小：1682 K

文摘

In order to realize the safety, high efficiency and rapidity of hard rock tunneling, we propose the drilling & hydraulic impact hard-rock tunneling (DHIHT) technology and method. Based on the LS-DYNA explicit module and APDL programming, the key parameters of DHIHT, including drilling spacing and drilling radius, were investigated. The simulation results show that: the drilling spacing should not exceed 0.20 m-larger distances weaken the actual breaking effect; the best drilling radius is about 0.035 m, larger or smaller distances would both decrease the effect of drilling-hole free surfaces. The field impact breaking experiments were conducted in Baitaizi township granite quarry, Jinzhou, Liaoning province, China. The experiment results indicate that DHIHT is a feasible method for hard-rock tunneling, but its efficiency still needs to be further optimized and improved.