Effect of microwave irradiation on thermal damage behavior of granite:Uniaxial compression test and finite-discrete approach  

作　　者：Bowen Sun Shengqi Yang Shigui Du Wenling Tian Shibin Tang Heng Li Zhennan Zhu 

机构地区：[1]State Key Laboratory for Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,China University of Mining and Technology,Xuzhou,221116,China [2]Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province,School of Civil Engineering,Shaoxing University,Shaoxing,312000,China [3]School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou,221116,China [4]Institute of Rock Mechanics,Ningbo University,Ningbo,315211,China [5]School of Civil Engineering,Dalian University of Technology,Dalian,116024,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2025年第2期827-844,共18页岩石力学与岩土工程学报(英文)

基　　金：funded by the Postgraduate Research and Practice Innovation Program of Jiangsu Province(Grant No.KYCX23_2744);the Fundamental Research Funds for the Central Universities(Grant No.2023XSCX051);the Graduate Innovation Program of China University of Mining and Technology(Grant No.2023WLKXJ182).

摘　　要：Microwave-assisted rock-breaking technology,as a novel hybrid approach,is anticipated to facilitate the efficient excavation of complex rock formations.It is therefore crucial to understand the damage and failure mechanisms of rocks that have been subjected to irradiation.In this study,uniaxial compression experiments were conducted on granite specimens after 1.4 kW microwave irradiation for varying durations.Furthermore,a numerical method was proposed to solve electromagnetic-thermal-mechanical coupling problems by integrating finite and discrete elements.The results demonstrated a differential temperature distribution(high temperature in the middle and low-temperature areas at the ends)in the granite specimens under microwave irradiation,which resulted in a notable reduction in their physical and mechanical properties.As the duration of irradiation increased,the rate of heating and the extent of strength reduction both diminished,while the morphology and distribution of cracks at ultimate failure became increasingly complex.The numerical method effectively addresses the simulation challenges associated with the electromagnetic selective heating of granite containing multiple polar minerals under microwave irradiation.This approach accounted for the non-uniform thermal expansion of the minerals and provided a comprehensive model of damage progression under compression.

关 键 词：Microwave-assisted rock breaking GRANITE Electromagnetic-thermal-mechanical(ETM)coupling Finite-discrete approach Three-dimensional(3D)grain-based model(GBM) 

分 类 号：TU452[建筑科学—岩土工程]