Numerical and experimental analyses of rock failure mechanisms due to microwave treatment

查看全文 作　　者：Haitham [1]M.Ahmed;Adel [2]Ahmadihosseini;Ferri [2]Hassani;Mohammed [1]A.Hefni;[1]HussinA.M.Ahmed;Hussein [1]A.Saleem;Essam [3]B.Moustafa;Agus [2]P.Sasmito 机构地区：[1]Mining Engineering Department,King Abdulaziz University,Jeddah,21589,Saudi Arabia;[2]Department of Mining and Materials Engineering,McGill University,Montreal,QC,H3A0E8,Canada;[3]Mechanical Engineering Department,King Abdulaziz University,Jeddah,21589,Saudi Arabia 出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》索引2023年第15卷第10期,共13页 基　　金：The authors extend their appreciation to the Deputyship for Research&Innovation,Ministry of Education in Saudi Arabia,for funding this research work through the project number(IFPRC036-135-2020)and King Abdulaziz University,DSR,Jeddah,Saudi Arabia. 摘　　要：Despite the extensive studies conducted on the effectiveness of microwave treatment as a novel rock preconditioning method,there is yet to find reliable data on the rock failure mechanisms due to microwave heating.In addition,there is no significant discussion on the energy efficiency of the method as one of the important factors among the mining and geotechnical engineers in the industry.This study presents a novel experimental method to evaluate two main rock failure mechanisms due to microwave treatment without applying any mechanical forces,i.e.distributed and concentrated heating.The result shows that the existence of a small and concentrated fraction of a strong microwave absorbing mineral will change the failure mechanism from the distributed heating to the concentrated heating,which can increase the weakening over microwave efficiency(WOME)by more than 10 folds.This observation is further investigated using the developed coupled numerical model.It is shown that at the same input energy,the existence of microwave absorbing minerals can cause major heat concentration inside the rock and increase the maximum temperature by up to three times. 关 键 词：Microwave treatment Numerical modeling Failure mechanism Energy efficiency Rock pre-conditioning