Citation

Wang Z, Li J, Wu H, Ma Z. China Saf. Sci. J. 2022; 32(8): 104-110.

Copyright

(Copyright © 2022, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2022.08.1682

PMID

unavailable

Abstract

In order to improve safety of open pit mines during blasting, a determination method of rock blast fracture area was proposed based on embedded test rod. Selection method of test rod material was determined based on propagation theory of explosion stress wave through structural plane and research results of existing explosion rupture gap area, and manufacturing steps and test procedures were provided. Then, blasting test was carried out on site, and range of blasting gap was obtained according to fracture range of test rods, and test results were verified by theoretical analysis method, numerical analysis, and on-site vibration velocity monitoring method. The results show that it is theoretically feasible to obtain fracture area of blasted rock by using embedded test rod, and the maximum horizontal radius of rock slope fracture zone under 10 kg blasting load is 2. 95 m. At the same time, the relative errors of three methods and results obtained by field test are less than 24. 8%, 18% and 4% respectively. © 2022 China Safety Science Journal. All rights reserved.

Language: zh