Waveform Detection of Elastic Wave Velocity Changes in Rock under Small Stress Perturbations
详细信息
- 责任者：Song Lili (Key Laboratory of Seismic Observation and Geophysical Imaging ; Institute of Geophysics ; China Earthquake Administration ; Beijing 100081 ; China) ; Ge Hongkui
- 刊名：Journal of China University of Petroleum
- 出版年：2012
- 卷期：36(4)
- 关键词：尾波 ; coda waves ; 弹性波 ; elastic waves ; 损伤力学 ; damage mechanics
- 页码：p.60-65
- 图表：illus., 1 table, 22 refs.
- 分类号：1702
- issnNo：ISSN1673-5005
- isbnNo：CN37-1441/TE
摘要
Elastic wave velocity changes can reflect changes of the rock internal structure and stress,and it becomes an important basis for monitoring engineering structures.An integrated observing system was established,and six samples were measured in uniaxial compression experiment. The characteristics of multiple scattering waves(coda) caused by rock heterogeneity were analyzed.Using the coda wave interferometry (CWI), high accuracy waveform detection of the velocity variation was achieved.The detection method of rock elastic wave velocity changes under small stress perturbations was developed.The regularity of wave velocity variation with stress was analyzed.The following are the conclusions: Coda wave interferometry can achieve high-precision dynamic monitoring under the small stress perturbations.Its advantages include rock disturbance,high sensitivity,good stability and simple operation.The relative change of coda wave velocity is a kind of characterization showing the rock damage state.Coda wave velocity changes have the memory effect.Compared with the traditional acoustic emission method,the method is stable and easily identifiable.It can be used for in-situ stress test of rock.
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