文献类型：期刊文献

英文题名：Visualizing the blast-induced stress wave and blasting gas action effects using digital image correlation

作者：Yang, Renshu Ding, Chenxi Yang, Liyun Lei, Zhen Zhang, Zhaoran Wang, Yanbing

第一作者：Yang, Renshu

通信作者：Ding, CX[1]

机构：[1]China Univ Min & Technol Beijing, Sch Mech & Civil Engn, Beijing 100083, Peoples R China;[2]State Key Lab Geomech & Deep Underground Engn Bei, Beijing 100083, Peoples R China;[3]Guizhou Inst Technol, Inst Min Engn, Guiyang 550003, Guizhou, Peoples R China;[4]North China Univ Technol, Sch Civil Engn, Beijing 100144, Peoples R China

第一机构：China Univ Min & Technol Beijing, Sch Mech & Civil Engn, Beijing 100083, Peoples R China

通信机构：corresponding author), China Univ Min & Technol Beijing, Sch Mech & Civil Engn, Beijing 100083, Peoples R China.

年份：2018

卷号：112

起止页码：47-54

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

收录：;EI(收录号：20184305987800);Scopus(收录号：2-s2.0-85055285805);WOS:【SCI-EXPANDED(收录号:WOS:000452314500006)】；

基金：The authors would like to acknowledge the anonymous reviewers for their valuable and constructive comments. This research is supported by the National Key Research and Development Program of China (No. 2016YFC0600903) and the National Natural Science Foundation of China (No. 51664007).

语种：英文

外文关键词：Blasting stress wave; Blasting gas; Digital image correlation; Stress attenuation; Decouple charge

摘要：Rock blasting fragmentation is a result of the combined action of a blast-induced stress wave and the blasting gas. Incorporating high-speed camera technology, an experimental system of high-speed digital image correlation is established and is extended to blasting research. Using two-dimensional model experiments, the action effects of a blast-induced stress wave and blasting gas on the formation of the crush and fracture zones are studied, and the blasting attenuation law in the elastic vibration zone is also analyzed. The results show that the blast-induced stress wave and the blasting gas are respectively the main driving forces for the crush zone and fracture zone formation. The effect of the blasting gas reduces the crush zone size and increases the crack propagation length as well as the medium's stress peak. In the elastic vibration zone, the radial and circumferential stress of the medium are both first compressive and then tensile. The radial and circumferential stress are respectively dominated by compressive and tensile stress, and the radial stress decays more rapidly. With increased distance from the borehole, the medium's stress state gradually turns from mainly circumferential tensile to mainly radial compressive. In addition, in decoupled charge blasting, the stress attenuation index shows a trend of initially increasing and then decreasing with the increase of the decoupling coefficient Compared with the attenuation of the circumferential stress, the air filling in the decoupled charge blasting more significantly affects the radial stress attenuation.