固体围压下完整花岗岩粘滑现象的实验研究  

Experimental Study on Stick Slip Phenomena of Intact Granite under Solid Confining Pressure

作　　者：程海旭[1] 吴开统[1] 张流[2] 

机构地区：[1]国家地震局分析预报中心,中国北京100036 [2]国家地震局地质研究所,中国北京100029

出　　处：《中国地震》1993年第3期211-222,共12页Earthquake Research in China

基　　金：地震联合基金会

摘　　要：本文用完整的花岗岩样品在固体围压三轴实验装置上压缩,研究围压和应变速率对岩样变形破裂过程、粘滑应力降、粘滑复发间隔及样品主破裂几何分布的影响。结果表明,加载速率较低时,粘滑应力降较大,复发间隔较长且分布无规律。加载速率越大,粘滑应力降越小,复发间隔也近似相等,粘滑事件表现出准周期性。围压和应变率较低时,岩石的主破裂会演变成两个交叉的共轭断裂面;而围压和应变率较高时,岩石的主破裂则演变成单一断裂面或入字形断裂面。本文结果对认识中国大陆板内地震孕育、发生及重复过程;研究地震重复发生的机制及影响地震复发间隔的主要因素都有重要意义。In this paper, the influence of confining pressure and loading velocity (strain rate of axial direction) on the rock sample deformation ,rapture process,stick slip stress drop,recurrence intervals and goemetric distribution of main fracture have been strudied by intact granites were pressed under triaxial loading machine. The experimental results show that loading velocity has a great influence on the stress drop and recurrence intervals. The less of loading velocity, the large of stress drop and recurrence intervals,as well as the distribution of recurrence intervals is ruleless. The more of loading velocity,the less of stress drop and recurrence intervals(and it is approximatelly constant),stick slip event behaves quasiperiodicity. Confining pressure and loading velocity also have an influence on rock deformation mechanism,rapture and sliding ways. When confining pressure and loading velocity is less,the main frcture of rock sample developed into crossed conjugate shear faults,but the main fracture developed into a single shear fault or a shape of 'X' shear fault as confining pressure and loading velocity is higher.The results of this paper have an important significance on realizing earthquake generation ,ocur-rence and recurrence process,as well as having an great significance on seismic recurrence mechanics and main factors influencing recurrence intervals

关 键 词：粘滑 应力降 地震 复发问题 花岗岩 

分 类 号：P315.1[天文地球—地震学]