花岗岩粗糙表面动摩擦形态演化  

Rough Surface Morphology of Granite Subjected to Dynamic Friction

作　　者：张磊[1] 王文帅 苗春贺 单俊芳[1] 王鹏飞[1] 徐松林[1,2] ZHANG Lei;WANG Wenshuai;MIAO Chunhe;SHAN Junfang;WANG Pengfei;XU Songlin(CAS Key Laboratory for Mechanical Behavior and Design of Materials,University of Science and Technology of China,Hefei 230027,Anhui,China;The United Laboratory of High-Pressure Physics and Earthquake Science,CEA Key Laboratory of Earthquake Prediction(Institute of Earthquake Science),China Earthquake Administration,Beijing 100036,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,安徽合肥230027 [2]中国地震局地震预测研究所高压物理与地震科技联合实验室,北京100036

出　　处：《高压物理学报》2021年第3期23-33,共11页Chinese Journal of High Pressure Physics

基　　金：高压物理与地震科技联合实验室开放基金(2019HPPES01);国家自然科学基金(11672286,11872361);中石油与中科院重大战略合作项目(2015A-4812)。

摘　　要：冲击过程中岩石界面动摩擦特性对于地震滑移等现象的研究有重要意义。基于分离式霍普金森压杆(SHPB)杆束技术对含倾斜界面的花岗岩进行冲击实验,分别采用光学显微镜和台阶仪,观测较大视场(毫米尺度)和较小视场(亚毫米尺度)下花岗岩界面粗糙形态。结果表明:微动滑移条件下,表面仍非常粗糙,没有大的凸起,但是对于局部初始较平滑的表面,冲击后由于表面的摩擦作用变得粗糙,很难观察到大位移滑移时的光滑滑移面。采用斜条型有限子群表示,结合微界面相对滑移磨损扩散的控制方程,建立岩石界面粗糙形态动力学演化的描述方法。初步结果验证了此方法的可行性,但需要结合深入的实验观测进行完善。研究结果对界面动摩擦演化过程及其机制的认识具有良好的参考意义。Dynamic friction characteristics of rock surface during impact are of great significance to investigations of seismic slip and other phenomena.Series of experiments on rock samples with inclined joint were conducted by the split Hopkinson pressure bar(SHPB)bundles device.Changes of surface roughness of granite were observed by optical microscope for large field of view(i.e.,millimeter scale)and step instrument for small field of view(i.e.,submillimeter scale).Under the condition of micro slip,the surface was still very rough,but there was no larger bulge;however,the local initially smooth surface became rough due to the friction effect of the surface.Thus it was difficult to observe the smooth sliding surface that appears during large displacement slip.Based on the governing equation of sliding friction and diffusion of micro surface,the description method of dynamic evolution of surface rough morphology was established by using inclined strip finite subgroup representation.The preliminary results show that this method was feasible,but it needs to be improved with more profound experimental observation.The results have a good reference significance for the understanding of the evolution process and mechanism of dynamic friction.

关 键 词：动摩擦 粗糙表面 分离式霍普金森压杆 有限群表示 

分 类 号：O341[理学—固体力学]