文献类型：期刊文献

英文题名：Study of decoupled charge blasting based on high-speed digital image correlation method

作者：Yang, Renshu Ding, Chenxi Yang, Liyun Lei, Zhen Zheng, Changda

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

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：2019

卷号：83

起止页码：51-59

外文期刊名：TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY

收录：;EI(收录号：20184005908710);Scopus(收录号：2-s2.0-85054238674);WOS:【SCI-EXPANDED(收录号:WOS:000454963800005)】；

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：Digital image correlation; Blasting; Decoupled charge; Decoupling coefficient; Filling medium; Stress attenuation index

摘要：Incorporating high-speed camera technology, an experimental system of high-speed digital image correlation is established and extended to blasting research. Based on the model experiment, the effects of the filling medium and the decoupling coefficient on stress evolution in decoupled charge blasting are studied. Different filling media are found to have a significant effect on the transmission of blasting energy. Compared with coupled charge blasting, decoupled charge blasting with air as the filling medium reduces the blasting stress peak in the specimens; while within a certain decoupling coefficient range, the decoupled charge blasting with plasticine as the filling medium increases the blasting stress peak in specimens. The blasting stress-attenuation index in specimens exhibits the trend of an initial increase and then a decrease with increasing decoupling coefficient, where the decoupling coefficient corresponding to the maximum stress attenuation index is determined by the filling medium. In addition, the numerical simulation results show that, in decoupled charge blasting, the filling medium greatly reduces the pressure at the borehole wall. With increasing decoupling coefficient, the pressure at the borehole wall attenuates with a mild degree of attenuation.