Study on the effect of blasting breaking rock under different stemming condition
Nan Yao,Cheng Tan,Yufei Li,Felix Oppong,Wei Jiang,Kunfeng Lin
Abstract
To study the blasting and rock-breaking effects of stemming materials and their mechanisms, the friction force tests on various stemming materials were conducted as well as field experiments involving blasting of concrete specimens under different stemming conditions. The internal blasting stress and fragmentation of the specimens after blasting were analyzed, and further discussions on rock blasting damage were conducted through numerical simulations. The results revealed that when stemming materials were used, the internal blasting stress within the rock was higher, and the size of rock fragments after blasting was smaller. Moreover, under stemming conditions, the distribution range of internal blasting stress widened, the stress peak increased, and the extent of rock damage and fragmentation area increased. The sealing performance of stemming materials was closely linked to their frictional resistance and sealing capability. Among the materials studied, polyurethane foam material demonstrated superior stemming effectiveness and convenient usage, making it a promising choice for engineering applications. These research findings provide valuable guidance for blasthole stemming in rock blasting scenarios.
Key Words
blasting stress; friction; numerical simulation; rock blasting; rock size; stemming material
Address
Nan Yao and Yufei Li — School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resource, Hubei, Wuhan 430081, China
Cheng Tan and Felix Oppong — School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
Wei Jiang — Baosteel Resources Group Co, Shanghai 201800, China
Kunfeng Lin — Wuhan Safety and Environmental Protection Research Institute of Sinosteel Group Co, Wuhan 430081, China
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