利用声发射震源机制解研究Ⅲ型剪切断层变形破坏特征  

STUDY ON DEFORMATION AND RUPTURE FEATURES OF MODEL III SHEAR FAULTS USING FOCAL MECHANISM SOLUTION OF ACOUSTIC EMISSION

作　　者：宋富喜[1,2] 马胜利[3] 

机构地区：[1]中国地质大学 [2]中国地震局地壳应力研究所北京100085 [3]中国地震局地质研究所地震动力学国家重点实验室

出　　处：《岩石力学与工程学报》2004年第23期4084-4089,共6页Chinese Journal of Rock Mechanics and Engineering

摘　　要：利用声发射技术,研究双向加载条件下含有 2 条交叉 III 型剪切断层的标本变形过程中的微破裂活动特征。总体上,微破裂活动有从标本的切穿区域向未切穿区域迁移及在断层间交替发生的趋势。破裂统计结果显示:标本变形前、后期与主压应力夹角较小和较大的断层分别起着控制作用,而整个标本的变形失稳是由断层相互作用导致的。The microfracture activity during the deformation of the sample containing two intersecting model III shear faults under biaxial' load is experimentally studied using acoustic emission technique. Generally, the microfractures tend to migrate from the cut side to the uncut side of the sample and occur alternately between the two faults. The statistics of focal mechanisms of microfractures shows that the faults with smaller and larger angles to the major principal stress dominate the deformation in the earlier and later stages, respectively. The interaction of the two faults controls the instability of the whole sample.

关 键 词：岩石力学 Ⅲ型剪切断层 声发射 震源机制 

分 类 号：TU459.3[建筑科学—岩土工程]