Abstract: The spatial and imporal evolution of acoustic emission, fault displacement and strain duringdeformation of compressional and extensional en-echelon faults has been studied experimentallyunder biaxial compression. The results show that two types of en-echelon faults have similar de-formation process,i.e. the deformation is predominated by fracturing and linking of jogs in thefirst stage and by sliding along faults in the second stage.However,in the compressional jog,high strain energy can be accumulated and intense release of strian and acoustic emission can beproduced,and the jog has a permanent resistance to the sliding of faults, But in the extensionaljog,rapid release of strain and strong acoustic emission event can not be produced,and the joghas almost no resistance to the sliding of faults in the second stage.The instability events causedby linkage of both jogs have obvious precursors,and the occurrence of precursors for instabilityoccured during the sliding depends on if there is strain transfer between different parts of faults.

Key words: en-echelon faults, Rock mechanical test, Acoustic emission, Fault displacement, Strain field

摘要： 在双轴压缩条件下对挤压型和拉张型雁列式断层变形破坏过程中声发射、断层位移及应变场的时空演化进行了实验研究。研究表明,两类雁列式断层具有类似的变形破坏过程,即前期以雁列区的破裂贯通为主,后期以沿断层的滑动为主。但挤压型雁列区内可积累较高的应变能,有较强的应变释放和声发射活动,雁列区对滑动始终起着阻碍作用;而拉张型雁列区内难以产生快速的应变释放和较强的声发射活动,雁列区对后期的滑动也无明显的阻碍作用。两类雁列区贯通所引起的失稳均有明显的前兆,而在随后滑动过程中失稳前兆的出现,取决于断层不同部位或段落之间是否有应变传递。

关键词: 雁列断层, 岩石大学实验, 声发射, 断层位移, 应变场