岩石节理动摩擦过程中的声发射和产热特性研究  

Investigation on acoustic emission and heat production characteristics on joint surfaces due to dynamic friction

作　　者：单俊芳[1] 徐松林[1] 张磊[1] 陈丽娜 王鹏飞[1] SHAN Jun-fang;XU Song-lin;ZHANG Lei;CHEN Li-na;WANG Peng-fei(CAS Key Laboratory for Mechanical Behavior and Design of Materials,Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,Anhui,China)

机构地区：[1]中国科学技术大学中国科学院材料力学行为和设计重点实验室

出　　处：《实验力学》2020年第1期41-57,共17页Journal of Experimental Mechanics

基　　金：国家自然科学基金(11672286,11602267,11472264,11872361);中石油与中科院重大战略合作项目(2015A-4812);安徽省自然科学基金(1708085MA05)资助

摘　　要：节理岩体摩擦普遍存在于地震孕震、板块滑动等自然现象中。目前研究的重点主要集中于大位移下滑动摩擦特性的揭示,很鲜少有人对摩擦滑移初期阶段的相关特性进行研究。本文基于改进的分离式霍普金森压杆装置(SHPB)建立了多点声发射和红外测温等实验装置,研究了5种角度节理表面在摩擦滑动初期的声发射和产热特性。结果表明,与节理摩擦滑移相关的信息位于声发射信号的高频域中,对于所研究的花岗岩样品,其频率范围为78.1~312.5kHz,低于该频率范围的信号源于撞击界面的扰动;与节理摩擦滑移相关的产热信息位于红外测温信号的低频域中,5种节理面摩擦滑移产热对应的温升明显较低。为了揭示这些测量信号的内在规律,基于数值方法建立了合理的分析模型。计算结果表明,随着节理角度的增大,节理面越易滑移,节理表面温升幅值越大,但都低于0.1℃,与实验结果相一致。Dynamic friction slip of rock joint is prevalent in seismic wave propagation and plate sliding. At present, great attention has been paid to revealing the sliding friction characteristics under large displacement, but the related characteristics at initial stage of friction-slip are seldom studied. The measurement techniques including the multi-point acoustic emission method and the infrared temperature method are established based on the modified split Hopkinson pressure device(SHPB), and the characteristics of acoustic emission and heat production at initial stage of friction sliding on the joint surfaces with five joint angles are investigated. The results show that wave profiles corresponding to the wave-induced micro slip is located at the higher frequency domain of the acoustic emission signals, e.g., frequencies ranging from 78.1 kHz to 312.5 kHz for granite specimens. While the signal measured at the lower frequency domain originates from the disturbances impacting the interface. Wave profiles corresponding to the heat radiation information is located at the lower frequency domain in the temperature signals, and the measured amplitudes of elevated temperature of five joint surfaces are obviously lower. To reveal the intrinsic rules of these measured signals, a reasonable analysis model based on the numerical method is established. The numerical results show that with increasing the joint angle, the joint surface slides more easily, and the amplitude of elevated temperature on the joint surface increases, which is always lower than 0.1℃. The calculations are in good agreement with the experimental results.

关 键 词：节理岩体 摩擦滑动 声发射 红外测温 数值计算 

分 类 号：O347.4[理学—固体力学]