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

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

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...

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Veröffentlicht in:矿业科学技术学报（英文版） 2015 (6), p.1041-1046
Hauptverfasser: Long Risheng, Sun Shaoni, Lian Zisheng, Liao Yaoyao, Qin Xiaofeng
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container_issue 6
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container_title 矿业科学技术学报（英文版）
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creator Long Risheng
Sun Shaoni
Lian Zisheng
Liao Yaoyao
Qin Xiaofeng
description 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, lar-ger 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.
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title A new technology for hard-rock tunneling based on drilling and hydraulic impact breaking
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