摘要
以构造地震孕震机制之三即交汇断层粘滑发震为模拟对象,利用双轴加载实验系统和红外热像仪对自然界经常出现的断层组合模式——不同交汇角度的组合断层的物理模型进行了室内加载实验,利用红外热像仪和声发射仪分别测定了加载过程中试样表面的红外辐射及断层活动的声发射时间序列。结果表明:(1) 声发射及红外辐射的时间序列特征受加载过程中试样的力学行为所控制,并表现出阶段性变化特点;(2) 声发射与红外辐射特征与断层几何结构有密切关系,当主应力与主断层成45°角时,红外辐射异常区主要沿主断层发育;(3) 垂直交汇的断层与斜交断层的声发射及红外辐射特征有明显差异,交汇角度(1°～90°)越大,交汇点处的红外辐射异常越明显。
The friction sliding of intersected faults is the third mechanism of tectonic earthquake. By use of biaxial loading system,thermal infrared (TIR) imaging system and acoustic emission (AE) devices, the TIR radiation and AE features of three kinds of intersected faults at different intersection angle were experimentally studied in the process of bi-sheared friction sliding. It is revealed that (1) the temporal sequential features of the AE and TIR radiation in the process of loading are controlled by fault behavior,and they show staged characteristics,(2) the features of AE and TIR radiation are tightly related to the geometrical structure of the intersected faults,and the abnormal TIR spots usually occur along the chief fault in condition that the principal stress is 45°in angle to the direction of the chief fault,and (3) the features of AE and TIR radiation from vertically intersected and slanting intersected faults are different,and the higher the intersection angle is,the stronger the TIR radiation is at the location of intersection point.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第3期401-407,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
全国优秀博士学位论文专项基金(200046)
北京市自然科学基金重点项目(8001003)联合资助项目。
关键词
遥感-岩石力学
构造地震
地震遥感
热红外辐射
声发射
交汇断层
remote sensing-rock mechanics,tectonic earthquake,earthquake remote sense,thermal infrared abnormity,acoustic emission,intersected faults
