Acoustic Emission Characteristics During Short-Time Creep Process of Red Sandstone Under Different Stress Level

doi:10.3969/j.issn.1005-3026.2015.09.028

Abstract

Abstract: The characteristics of acoustic emission (AE) of the red sandstone during short-time creep were studied under different stress level. The results show that the AE event ratios and energy ratios decrease with time increase during the period from decelerated creep to steady creep， and the corresponding reductions in amplitude decrease with the increasing stress level. The AE amplitude decreases and keeps relatively stable when the stress is about 40%~60% and 70%~80% of peak stress， respectively. The AE amplitude transition frequency increases obviously during the accelerated creep stage， and its event ratio and energy ratio begin to increase in the mid-late stage of accelerated creep. Therefore， the creep stage of red sandstone can be distinguished by the AE characteristics.

Key words: red sandstone, step loading and unloading, stress level, short-time creep, acoustic emission

CLC Number:

TD315⁺.1

GONG Cong， LI Chang-hong， ZHAO Kui. Acoustic Emission Characteristics During Short-Time Creep Process of Red Sandstone Under Different Stress Level[J]. Journal of Northeastern University:Natural Science, 2015, 36(9): 1347-1352.

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