Research on Time-Frequency Characteristics of Infrasound Information before rock Failure under Compression

DOI

10.2991/ic3me-15.2015.387How to use a DOI?

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Abstract

Six group of axial compression tests of sandstone were conducted in laboratory, and the infrasound signals of each test process were recorded synchronously then the time-frequency characteristics of all signals have been analyzed to find the failure precursor information, the results show that: The infrasound of rock failure always manifests as two forms, one is persistent low amplitude signal and the other is spasmodic high amplitude signal, the two kind of infrasound emission forms may corresponding to the two process of micro cracks development in rock specimens, that is the random nucleartion process of cracks and the concentration and pooling nucleartion process of cracks, from the begin of loading to rock failure ,there always have two or three times of centralized high amplitude signal emission; also, the time-frequency analysis find that, there have different frequency components between low amplitude and high amplitude, the low amplitude signal has relatively single frequency components, the range of frequency mainly concentrated in 6~8Hz the central frequency is about 7.5Hz otherwise, the high amplitude signal has more complicated frequency components, it has three frequency parts, the lower frequency part concentrated in 2~6Hz, the central frequency is about 4.5Hz, the middle frequency part lies in 6~8Hz the central frequency is about 7.5Hz, and the higher frequency part is ranged in 8~12Hz, the central frequency is about 9Hz to 10Hz, different high amplitude signal always contains two or three frequency ranges above. The characteristics of infrasound waveform and its time-frequency above can be looked as an important mark of precursor infrasound emission by rock before failure.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Hong Xu
AU  - Tingqiang Zhou
PY  - 2015/08
DA  - 2015/08
TI  - Research on Time-Frequency Characteristics of Infrasound Information before rock Failure under Compression
BT  - Proceedings of the 3rd International Conference on Material, Mechanical and Manufacturing Engineering
PB  - Atlantis Press
SP  - 2014
EP  - 2021
SN  - 2352-5401
UR  - https://doi.org/10.2991/ic3me-15.2015.387
DO  - 10.2991/ic3me-15.2015.387
ID  - Xu2015/08
ER  -