微破裂成核过程和应力(场)关系的实验研究  

EXPERIMENTAL STUDY BETWEEN CORE-FORMING PROCESS OF MICRO RUPTURE AND STRESS FIELD

作　　者：杨润海[1] 许昭永[1] 赵晋明[1] 王彬[1] 熊秉衡[2] 王正荣[2] 张永安[2] 余灿麟[2] 

机构地区：[1]云南省地震局 [2]云南工业大学激光研究所

出　　处：《地震研究》1998年第2期128-133,共6页Journal of Seismological Research

摘　　要：利用实时全息干涉计量摄影装置记录有机玻璃板微破裂过程中应力（场）的变化，讨论了微破裂的丛集过程及其与应力（场）的关系，宏观裂缝的分叉和延伸规律，大破裂与微破裂的关系。研究结果表明，大破裂发生前微破裂有丛集（成核）现象，微破裂的丛集与局部应力集中有关，大破裂（宏观裂缝）延伸方向是应力场高梯度变化方向，大破裂的发生位置与微破裂的丛集无明显关系。ariation of stress field in the process of microfracture of plexiglass is recorded by holography in real time. The relation between clustering process of microfracture and stress field, patterns of branching and extension of macro fissures, the relation of macro and microfracture have been discussed. The results show that the microfracture has clustering phenomenon before the macro fracture occurs; the clustering of microfracture is related with local stress concentration; the direction of macro rupture extension is the direction of variation of stress field in high gradient; the position of macro rupture occurrence has no clear relation with the clustering of microfracture.

关 键 词：微破裂集 成核过程 应力异常 实验研究 前震源 

分 类 号：P315.3[天文地球—地震学] P315.8[天文地球—固体地球物理学]