单轴压缩条件下房山花岗岩超声波速度成像实验研究  

Experimental Studies of Ultrasonic Tomography on Fangshan Granite under Uniaxial Compression

作　　者：和泰名[1] 刘政一[1] 李世愚[1] 

机构地区：[1]中国地震局地球物理研究所地震观测与地球物理成像重点实验室,北京100081

出　　处：《CT理论与应用研究（中英文）》2015年第5期657-665,共9页Computerized Tomography Theory and Applications

基　　金：2013中国地震局地球物理研究所中央级公益性科研院所基本科研业务专项(DQJB13B06)

摘　　要：在实验室对房山花岗岩进行单轴压缩加载,通过布设在岩石四周的26个超声波探头,在不同变形阶段,观测了岩石的超声波速度,反演了P波速度结构。速度成像结果显示,在压实和线弹性变形阶段,P波速度逐步全局升高。最终失稳破裂前,高速区域范围逐渐收缩,同时,形成条带低速带,最终失稳破裂发生在低速带上。Fangshan granite ultrasonic velocity was measured under uniaxial compression in Lab and its tomographic imaging was conducted at the different deformation. The imaging processes used 26 sensors putting around the sample. The p velocity continues to increase with increasing application of uniaxial compression in the whole body of the granite at the stages of compaction and linear elastic. Before catastrophic rock failure, the increasing velocity region gradually shrinks and the low-belt velocity zones are forming, on which the catastrophic failure takes place.

关 键 词：超声波成像 房山花岗岩 单轴压缩 

分 类 号：P315.8[天文地球—地震学]