Influence of water coupling coefficient on the blasting effect of red sandstone specimens

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外文摘要：This study investigates the impact of different water coupling coefficients on the blasting effect of red sandstone.The analysis is based on the theories of detonation wave and elastic wave,focusing on the variation in wall pressure of the blasting holes.Using DDNP explosive as the explosive load,blasting tests were conducted on red sandstone specimens with four different water coupling coefficients:1.20,1.33,1.50,and 2.00.The study examines the morphologies of the rock specimens after blasting under these different water coupling coefficients.Additionally,the fractal dimensions of the surface cracks resulting from the blasting were calculated to provide a quantitative evaluation of the extent of rock damage.CT scanning and 3D reconstruction were performed on the post-blasting specimens to visually depict the extent of damage and fractures within the rock.Additionally,the volume fractal dimension and damage degree of the post-blasting specimens are calculated.The findings are then combined with numerical simulation to facilitate auxiliary analysis.The results demonstrate that an increase in the water coupling coefficient leads to a reduction in the peak pressure on the hole wall and the crushing zone,enabling more of the explosion energy to be utilized for crack propagation following the explosion.The specimens exhibited distinct failure patterns,resulting in corresponding changes in fractal dimensions.The simulated pore wall pressure-time curve validated the derived theoretical results,whereas the stress cloud map and explosion energy-time curve demonstrated the buffering effect of the water medium.As the water coupling coefficient increases,the buffering effect of the water medium becomes increasingly prominent.

外文关键词：

Water coupling coefficientRadial uncoupled chargeNumerical simulationFractal dimension

作者：

Yang Li、Renshu Yang、Yanbing Wang、Dairui Fu

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作者单位：

School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China

School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China

基金：

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities

项目编号：

2021YFC2902103519340012023JCCXLJ02

出版年：

2024

DOI：

10.1007/s40789-023-00620-6

国际煤炭科学技术学报(英文)

CSTPCD

ISSN：2095-8293

年,卷(期)：2024.11(1)