文献类型：期刊文献

英文题名：Energy regulation mechanism and medium-filling effect of energy-focusing blast

作者：Guo, Pengfei[1,2];Zhang, Xingyu[3];Ye, Kengkeng[4];Wang, Xu[1];Huang, Man[1];Hu, Jinzhu[1];He, Manchao[5]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[2]China Univ Min & Technol, Sch Mines, Xuzhou 221116, Peoples R China;[3]AGH Univ Krakow, Fac Geodata Sci Geodesy & Environm Engn, PL-30059 Krakow, Poland;[4]Wencheng Cty Transportat Bur, Wenzhou 325000, Peoples R China;[5]China Univ Min & Technol Beijing, State Key Lab Tunnel Engn, Beijing 100083, Peoples R China

年份：2025

卷号：35

期号：5

起止页码：767

外文期刊名：INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:001506757600001)、、EI(收录号：20251918372842)、Scopus(收录号：2-s2.0-105004305486)、WOS

基金：This work was supported by the National Natural Science Foundation of China (No. 51904188) , the China Postdoctoral Science Foundation Funded Project (No. 2024M763564) , and the Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province (No. ZJRMG-2022-03) , which are gratefully acknowledged.

语种：英文

外文关键词：Directional blast; Medium influence; Energy utilization; Fracture mechanism

外文摘要：The energy-focusing blast is an innovative and ingenious method to achieve directional fracturing. Understanding its energy regulation mechanism is critical to enhancing its practical effectiveness. This study investigates the energy regulation mechanism and explores the medium-filling effects within the energy-focusing blast by employing theoretical analysis, numerical simulations, and model tests. The findings by theoretical and numerical analysis first reveal that two stages of the fracturing and tensile stage govern the directionally crack propagation, in which the explosion energy in the non-energyfocusing direction is suppressed, compressing the borehole wall, while redirected energy produces tensile stress in the energy-focusing direction, driving the formation of directional cracks. The choice of filling medium significantly affects directional cracking due to its impact on energy distribution and regulation, and key properties such as wave impedance and compressibility of the filling medium are critical. Experimental comparisons using air, sand, and water as filling media further disclose the distinct effects of the medium on energy regulation and directional crack growth of the energy-focusing blast. The maximum shaped-energy coefficients for air, sand, and water are 1.30, 4.41, and 6.12 in the energy-focusing direction, respectively. Meanwhile, the stress attenuation rate of air, sand, and water increases in that order. The higher wave impedance and lower compressibility of water support efficient and uniform energy propagation, which subtly enhances the tensile actions in the focusing direction and intensifies the overall stress impact of the energy-focusing blast. In addition, the stresses in the non-energyfocusing directions decrease as the angle from the energy-focusing direction increases, while the stresses are relatively uniform for both air and water but noticeably uneven for sand; meanwhile, the fractal dimensions of blasting cracks in the case of air, water, and sand are 1.076, 1.068, and 1.112, respectively. Sand as a filling medium leads to increased crack irregularities due to its granularity and heterogeneity. The water medium strikes an optimal balance by promoting the blasting energy transition and optimizing the energy distribution, maintaining the least flatness of the directional crack during energy-focusing blasts. (c) 2025 Published by Elsevier B.V. on behalf of China University of Mining & Technology. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).