关键词: 岩石力学实验, 断层滑动, 摩擦特性, 速度依赖性, 脱水作用

Abstract: The velocity dependence of friction along fault zone with montmorillonite gouge at different temperatures has been studied on a biaxial friction rig at high temperature.The results show that the frictional strength of fault zone increases with increasing temperature,while the velecity dependence is rather complex. At room temperature and 100℃,the friction shows weak velocity weakening at slip rate below 1.4um/s,but velocity strengthening above 1.4 um/s.At 200℃,velocity strengthening is observed at all slip rates.At 300℃,the friction still shows velocity strengthening at slip rate above 1.4um/s,but changes into velocity weakening at slip rate below 1.4um/s. When temperatures are above 400℃,great velocity weakening is observed at all slip rates. The analysis indicates that the changes in frictional behav-ior are closely related with the dehydration and relevant change in deformation mode of fault gouge.

Key words: Rock mechanical test, Fault slip, Frictional property, Vdocity dependence, Dehydration