文献类型：期刊文献

英文题名：Instantaneous expansion with a single fracture: A new directional rock-breaking technology for roof cutting

作者：Zhang, Quan[1,2];He, Manchao[1,2];Wang, Jiong[2];Guo, Shan[2];Guo, Zhibiao[2];Liu, Xiaoyu[2];Hu, Jinzhu[2,3];Ma, Zimin[4];Fan, Lanxiang[2];Guo, Pengfei[5]

机构：[1]China Univ Min & Technol, Sch Mines, Xuzhou 221116, Jiangsu, Peoples R China;[2]China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Beijing 100083, Peoples R China;[3]Florence Univ, Dept Earth Sci, I-50121 Florence, Italy;[4]Shandong Univ Technol, Sch Resources & Environm Engn, Zibo 255049, Shandong, Peoples R China;[5]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Zhejiang, Peoples R China

年份：2020

卷号：132

外文期刊名：INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES

收录：SCI-EXPANDED(收录号：WOS:000562702800008)、、EI(收录号：20202508847492)、Scopus(收录号：2-s2.0-85086497921)、WOS

基金：This work was financially supported by the National Key Research and Development Program of China (No. 2016YFC0600901) and the National Natural Science Foundation of China (No. 41941018 and No. 51904188) that are gratefully acknowledged.

语种：英文

外文关键词：Instantaneous expansion with a single fracture; Alternative explosives; Directional rock splitting; Crack propagation; Roof cutting; Shaped charge blasting

外文摘要：Directional roof-cutting with shaped charge blasting is dangerous and produces large vibrations. Accordingly, a new, nonexplosive method known as instantaneous expansion with a single fracture (IESF) has been developed and tested in the field. This method uses a slit-oriented pipe and a special slitting agent triggered by electric current without a detonator. It is capable of producing a single crack that propagates through the rock in a selected direction. The mechanism of directional roof-cutting using IESF is analyzed, and the conditions for directional crack initiation and propagation are presented. The new technique has been successfully applied to directional roof-cutting in an actual coal mine. It resulted in a larger crack rate, a smaller charge, reduced vibration, and an improved safety profile than shaped charge blasting. IESFs are a substitute for explosives and are expected to have broad application prospects in directional rock breaking.