不同围压下岩石破坏过程的声发射频率及b值特征

doi:10.13722/j.cnki.jrme.2015.1044

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Abstract The failure tests on marbles under conventional triaxial loading were carried out. The ringing count rate of acoustic emission(AE) of rock，the frequency as well as the variation of b value at the failure stage and the sign of rock failure under various confining pressures were investigated. The experimental data were processed with the extreme-point symmetric mode decomposition method. The AE in the triaxial compression test was small at the compaction and elastic stages and was larger after entering the plastic stage and was increased significantly after the stress expansion. There was an AE quiet period before the peak strength. AE frequency and b value fluctuated all the time which varied drastically at the initial loading process and stayed at a higher level. At the plastic stage，they changed less and stayed at a lower level. Corresponding to the AE quiet period，there was a period that AE frequency and b value changed relatively small in the plastic stage. Under the lower confining pressures，the AE frequency before rock failure and the value of b dropped dramatically，indicating that the brittle failure of rock occurred. Under the higher confining pressures，the variations of AE frequency before the rock failure and the value of b was relatively stable，suggesting that the progressive failure in rock occurred.

Key words： rock mechanics acoustic emission frequency b value failure precursor

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.1044 OR http://www.rockmech.org/EN/Y2015/V34/I10/2057

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