Analysis of bender element tests

被引:3
|
作者
Arulnathan, R [1 ]
Boulanger, RW
Riemer, MF
机构
[1] Univ Calif Davis, Dept Civil & Environm Engn, Davis, CA 95616 USA
[2] Univ Calif Berkeley, Dept Civil & Environm Engn, Berkeley, CA 94720 USA
来源
GEOTECHNICAL TESTING JOURNAL | 1998年 / 21卷 / 02期
关键词
shear modulus; shear wave velocity; bender element; triaxial test;
D O I
暂无
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
A study is presented of potential errors in, and methods of interpreting, the results of cantilever-type, piezoceramic bender element tests for measuring the shear wave velocity of laboratory soil specimens. Interpretations based on the first direct arrival in the output signal are often masked by near-field effects and may be difficult to define reliably. Interpretations based on characteristic points or crosscorrelation between the input and output Signals are shown to be theoretically incorrect in most cases because of: (1) the effects of wave interference at the boundaries; (2) the phase lag between the physical wave forms and the measured electrical signals; and (3) non-one-dimensional wave travel and near-field effects. Interpretations based on the second arrival in the output signal are theoretically Subject to errors from non-one-dimensional wave travel and near-field effects. Differences in V-s values obtained by the different interpretation methods are illustrated analytically and experimentally.
引用
收藏
页码:120 / 131
页数:12
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