岩石破裂中的电声效应  

ELECTRO- ACOUSTIC EFFECT IN ROCK FRACTURING

作　　者：郭自强[1,2,3] 郭子祺 钱书清[1,2,3] 李世愚 刘晓红[1,2,3] 罗祥麟[1,2,3] 

机构地区：[1]中国科技大学北京研究生院 [2]中国地震局地球物理研究所 [3]北京航空技术研究中心

出　　处：《地球物理学报》1999年第1期74-83,共10页Chinese Journal of Geophysics

基　　金：国家自然科学基金;地震科学联合基金

摘　　要：利用１６通道高速数据采集系统及三分量声发射换能器对多种岩石样品在单轴压缩及双剪破裂过程中产生的电磁辐射（ＥＭ）和声发射（ＡＥ）及其相互关系进行了实验研究．结果表明，岩样尺寸和岩石矿物成分对电磁辐射的产生及其特性都有较大影响．ＥＭ与ＡＥ的关系具有多样性，既有伴随ＡＥ出现的ＥＭ，还有不伴随ＡＥ出现的ＥＭ．这表明除微破裂产生的电磁辐射外，可能存在产生电磁辐射的非破裂机制．Electromagnetic (EM) and acoustic emissions ( AE) and their relations during the process of fracturing of various rock samples have been studied. The samples werefractured under either uniaxial compression or under double shearing. The data wererecorded using a high-speed recording system with 1 6 frequency channels andthree-component acoustic transducers. Our result shows that the emissions andproperties of EM and AE were affected strongly by the sizes and mineral compositions of rock samples. The relationships between EM and AE emissions were various; for example, some EM emissions were accompanied by AE, but some werenot.Our result suggests that in addition to micro fracturing, there may exist somenonfracturing mechanism responsible for electromagnetic emissions .

关 键 词：岩石破裂 电声效应 震电关系 地震前兆 

分 类 号：P315.7[天文地球—地震学] P584[天文地球—固体地球物理学]