Abstract: The spatial and temporal evolution of acoustic emission, fault displacement and strain duringdeformation of complex en-echelon faults composed of compressional and extensional en-echelonfaults has been studied experimentally under biaxial compression.The results show that the deformation process and the evolution of physical field on complex en-echelon faults are not a simplecombination of that of two types of en-echelon faults,but contain interaction between them.Aninteresting phenomenon is that acoustic emission events with high energy occur mostly alongmain fault near extensional jog with lower stress level,not along fault near compressional jogwith higher stress level,but the time of such events is obviously controlled by the deformationprocess of compressional jog.

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由挤压型和拉张型雁列式断层组合而成的复杂雁列断层系变形过程中声发射、断层位移及应变的时空演化进行了实验研究,结果表明,复杂雁列式断层系的变形过程及相应的物理场演化并非是两种雁列式断层的简单叠加,而是包含着它们之间的相互作用。能量较强的声发射事件成核部位主要集中在应力水平较低的张性雁列区附近的主于断层上,而不是应力水平较高的压性雁列区,但这种事件发生的时间则明显受控于压性雁列区的变形过程。

关键词: 雁列断层, 岩石力学实验, 声发射, 断层位移, 应变场