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http://dx.doi.org/10.7474/TUS.2018.28.6.692

A Study on the Effect of Artificial Cutting Slot on the Fragmentation and Vibration Propagation in the Full-scaled Concrete Block Blasting  

Oh, Se-Wook (Department of Mineral Resources & Energy Engineering, Chonbuk National University)
Min, Gyeong-Jo (Department of Mineral Resources & Energy Engineering, Chonbuk National University)
Park, Se-Woong (Department of Mineral Resources & Energy Engineering, Chonbuk National University)
Park, Hoon (KOREA CACOH Corporation)
Noh, You-Song (KOREA CACOH Corporation)
Suk, Chul-Gi (KOREA CACOH Corporation)
Cho, Sang-Ho (Department of Mineral Resources & Energy Engineering, Chonbuk National University)
Publication Information
Tunnel and Underground Space / v.28, no.6, 2018 , pp. 692-705 More about this Journal
Abstract
Ground vibration is one of the remarkable issues in tunnel blasting. In recent studies, to improve the fragmentation with reduction of ground vibration in tunnel blasting, a vibration-controlled blasting method with artificial cutting slot near the center-cut holes has been suggested. This study examines the effect of the different arrangement of artificial cut-slot on the vibration reduction and fragmentation by performing the full-scaled concrete block blast experiments and the numerical simulations with 3D-DFPA. The results show that the existence of artificial slot contributes to the improvement of vibration reduction, blast fragmentation and the efficiency of the cutting slot blast. It can be explained that the artificial slot play a free surface role and should decrease the burden between the cut holes. Crater volumes of the blasted concrete blocks were measured by 3-dimensional digital image analysis and compared with the ideal standard crater volume which can be calculated by theoretical standard blast design method. As a result, the ratio of burden and hole diameter which should achieve the standard crater in the cut-hole blasting were suggested.
Keywords
Tunnel blasting; Center-cut blasting; Blasting vibration reduction; Artificial slot free surface; Full-scaled blasting experiment;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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