台阶爆破的能量控制和区块性能优化

IF 7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Ming Tao , Yuanquan Xu , Rui Zhao , Yulong Liu , Chengqing Wu
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引用次数: 0

摘要

本研究采用数字图像相关(DIC)方法,对不同趾部负担的类岩模型爆破试验进行了研究,并分析了爆破引起的裂缝演变。此外,还对爆破后的碎片进行了图像处理,以定量研究爆破性能。建立了一个三维数值模型,并根据实验结果进行了验证。数值研究了爆破孔倾角(70°、80° 和 90°)和短延迟对碎片尺寸分布(FSD)的影响。为验证数值结果,还进行了现场试验。实验结果表明,碎片的总体尺寸随着趾部负担的增加而显著增大。爆炸能量利用率从 3.56 % 到 13.16 % 不等,呈先增后减的趋势。数值结果表明,与垂直爆破相比,当爆破孔倾角为 70°时,碎片分布更均匀,岩石破碎率显著提高。与趾部负担相比,短时延迟对混凝土破碎的影响微乎其微。现场测试结果表明,在台阶爆破中利用倾斜爆破孔可以获得更窄的 FSD 范围和稳定的坑壁。该研究为优化台车爆破参数提供了理论指导,对提高露天矿爆破能量利用率和生产效率具有重要的现实意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Energy control and block performance optimization of bench blasting

In this study, rock-like model blast tests with varying toe burdens are conducted and the evolution of blast-induced fractures is analyzed using the digital image correlation (DIC) method. In addition, post-blast fragmentations are image-processed to quantitatively investigate the blasting performance. A three-dimensional numerical model is developed and validated against the experimental results. The effects of blasthole inclination (70°, 80°, and 90°) and short delays on fragment size distribution (FSD) are numerically investigated. Field trials are conducted to verify the numerical results. The experimental results reveal that the overall fragment size increases significantly in proportion to the toe burden. The explosion energy utilization rates range from 3.56 % to 13.16 %, with a tendency to initially increase and subsequently decrease. The numerical results demonstrate that fragments are more evenly distributed with a blasthole inclination of 70°, resulting in a remarkable improvement in rock fragmentation compared to a vertical blasthole. Compared to the toe burden, the influence of short delays on concrete fragmentation is insignificant. The field test results indicate that a narrower FSD range and stable pit walls are achieved by utilizing inclined blastholes in bench blasting. This study provides theoretical guidance for optimizing bench blasting parameters, which has practical significance for improving explosive energy utilization and production efficiency in open-pit mines.

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来源期刊
CiteScore
14.00
自引率
5.60%
发文量
196
审稿时长
18 weeks
期刊介绍: The International Journal of Rock Mechanics and Mining Sciences focuses on original research, new developments, site measurements, and case studies within the fields of rock mechanics and rock engineering. Serving as an international platform, it showcases high-quality papers addressing rock mechanics and the application of its principles and techniques in mining and civil engineering projects situated on or within rock masses. These projects encompass a wide range, including slopes, open-pit mines, quarries, shafts, tunnels, caverns, underground mines, metro systems, dams, hydro-electric stations, geothermal energy, petroleum engineering, and radioactive waste disposal. The journal welcomes submissions on various topics, with particular interest in theoretical advancements, analytical and numerical methods, rock testing, site investigation, and case studies.
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