Comparison of microwave- and thermal-assisted rock fragmentation methods at different temperatures and loading rates

IF 11.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology Pub Date : 2024-06-01 DOI:10.1016/j.ijmst.2024.06.009

Wei Yao , Shuai Wang , Bangbiao Wu , Ying Xu , Kaiwen Xia

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引用次数: 0

Abstract

Understanding the effects of microwave irradiation and thermal treatment on the dynamic compression and fragmentation properties of rocks is essential to quantify energy consumption in rock engineering. In this study, Fangshan granite (FG) specimens were exposed to microwave irradiation and heat treatment. The damage of FG specimens induced by these two methods was compared using X-ray CT scanning and ultrasonic wave method. The temperatures of FG after microwave irradiation and thermal treatment were effectively evaluated using a newly proposed technique. A novelty method for precisely determining the geometric features of fragments is developed to estimate the fragmentation energy. Thus, the dynamic uniaxial compressive strength (UCS), the dynamic fragmentation characteristics, and the fragmentation energy of FG after these two pretreatment methods can be reasonably compared. The noticeable distinction of loading rate effect on the dynamic UCS of FG between these two pretreatment methods is first observed. A relationship is established between the dynamic UCS and the damage induced by microwave irradiation and heat treatment. Moreover, fragmentation energy fan analysis is introduced to accurately compare the fragmentation properties of FG after two pretreatment methods in dynamic compression tests.

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不同温度和装载率下微波和热辅助岩石破碎方法的比较

了解微波辐照和热处理对岩石动态压缩和破碎特性的影响对于量化岩石工程中的能耗至关重要。本研究对房山花岗岩（FG）试样进行了微波辐照和热处理。使用 X 射线 CT 扫描和超声波方法比较了这两种方法对房山花岗岩试样造成的破坏。利用一种新提出的技术，有效评估了微波辐照和热处理后 FG 的温度。开发了一种精确测定碎片几何特征的新方法来估算碎片能量。因此，可以合理地比较两种预处理方法后 FG 的动态单轴抗压强度（UCS）、动态碎裂特征和碎裂能。首先观察到两种预处理方法的加载速率对 FG 动态单轴抗压强度影响的明显区别。建立了动态 UCS 与微波辐照和热处理引起的损伤之间的关系。此外，还引入了碎裂能量扇形分析法，以准确比较两种预处理方法后 FG 在动态压缩试验中的碎裂特性。

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来源期刊

International Journal of Mining Science and Technology Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

19.10

自引率

11.90%

发文量

2541

审稿时长

44 days

期刊介绍： The International Journal of Mining Science and Technology, founded in 1990 as the Journal of China University of Mining and Technology, is a monthly English-language journal. It publishes original research papers and high-quality reviews that explore the latest advancements in theories, methodologies, and applications within the realm of mining sciences and technologies. The journal serves as an international exchange forum for readers and authors worldwide involved in mining sciences and technologies. All papers undergo a peer-review process and meticulous editing by specialists and authorities, with the entire submission-to-publication process conducted electronically.