Effect of microwave heating on rock damage and energy evolution

IF 3 3区工程技术 Q2 ENGINEERING, GEOLOGICAL Canadian Geotechnical Journal Pub Date : 2024-09-05 DOI:10.1139/cgj-2024-0071

Tan Li, Wei Wang, Guangbo Chen, Qinghai Li

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Abstract

Canadian Geotechnical Journal, Ahead of Print.
Rock fragmentation efficiency can be increased by microwave heating. The mechanical properties and energy evolution characteristics of coarse sandstone specimens under different microwave heating conditions are compared in this paper. The effects of microwave heating time and power on coarse sandstone specimens of peak stress, elastic modulus, brittleness index, damage variable, and impact energy index are analyzed. The results indicate that the microwave heating power and microwave heating time are inversely proportional to peak stress and elastic modulus and directly proportional to peak strain. With the increase of microwave heating power and microwave heating time, the brittleness index and damage variable of rock specimens increase, the impact energy index decreases. The microwave heating power and microwave heating time increase the rock brittleness index. The energy absorption rate of rock specimens decreases with the increase of microwave heating time. The impact energy index is inversely proportional to microwave heating power and microwave heating time. High-power and long-time microwave heating can reduce the possibility of rockbursts and the intensity of potential dynamic disasters. The research conclusion can provide the theoretical and technical basis for breaking rock by microwave heating.

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微波加热对岩石损伤和能量演化的影响

加拿大岩土工程学报》，提前印刷。微波加热可提高岩石破碎效率。本文比较了不同微波加热条件下粗砂岩试样的力学性能和能量演化特征。分析了微波加热时间和功率对粗砂岩试样峰值应力、弹性模量、脆性指数、损伤变量和冲击能指数的影响。结果表明，微波加热功率和微波加热时间与峰值应力和弹性模量成反比，与峰值应变成正比。随着微波加热功率和微波加热时间的增加，岩石试样的脆性指数和损伤变量增大，冲击能指数减小。微波加热功率和微波加热时间会增加岩石的脆性指数。岩石试样的能量吸收率随微波加热时间的增加而降低。冲击能指数与微波加热功率和微波加热时间成反比。大功率、长时间的微波加热可以降低岩爆的可能性和潜在动力灾害的强度。研究结论可为微波加热破岩提供理论和技术依据。

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来源期刊

Canadian Geotechnical Journal 地学-地球科学综合

CiteScore

7.20

自引率

5.60%

发文量

163

审稿时长

7.5 months

期刊介绍： The Canadian Geotechnical Journal features articles, notes, reviews, and discussions related to new developments in geotechnical and geoenvironmental engineering, and applied sciences. The topics of papers written by researchers and engineers/scientists active in industry include soil and rock mechanics, material properties and fundamental behaviour, site characterization, foundations, excavations, tunnels, dams and embankments, slopes, landslides, geological and rock engineering, ground improvement, hydrogeology and contaminant hydrogeology, geochemistry, waste management, geosynthetics, offshore engineering, ice, frozen ground and northern engineering, risk and reliability applications, and physical and numerical modelling. Contributions that have practical relevance are preferred, including case records. Purely theoretical contributions are not generally published unless they are on a topic of special interest (like unsaturated soil mechanics or cold regions geotechnics) or they have direct practical value.