关键词: 非匀阻系数, 应力降, 不平度, 失稳型式

Abstract: The nonuniform-resistance effect of faulting surface is one of the important factors determining the instability mode and whether earthquake occurs or not.The experimental studies show that the sudden instability can take place along a wavy and rough sliding surface only as it is relatively flattened and smoothed after the asperities were cut and broken in the sliding process and unevenness and resistance nonuniformity of sliding surface can be indicated as a so-called nonuniform-resistance coefficient,which is a relative measurement of the displacement for uniformization,A new method for experimental determining the value of nonuniform-resistance coefficient is proposed by comparing the different unevennesses and stress drops between sawcut and fracture surfaces in rocks and the relatioins between the nonuniform-resistance coefficient and relative waviness for granodiorite,granite and quartzite are given in this paper,which may provide a basis for judging the possibility of earthquake along a fault.

Key words: Nonuniform-resistance coefficient, Stress drop, Unevenness, Instability mode