外部激励对类岩石材料阻尼比的影响

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Abstract Rock damping ratio，as an important parameter that reflects capacity of dissipating energy of vibrating rock，is influenced by multiple factors and very sensitive. To study the rock damping ratio?s change law in different excitation modes and vibrating ways，gypsum specimen?s damping ratio is obtained in experiments in the states of forced non-resonance，forced resonance and free vibration of different wave forms. The influences of strain amplitude，vibration frequency and wave forms(P wave and S wave) on the gypsum specimen?s damping ratio are considered. Test results show that adjustment stage，smooth stage，steady growth stage of damping ratio will follow in proper sequence as the specimen?s strain increasing. In the smooth stage，there is a damping ratio peak under a certain frequency. When more than this frequency，gypsum specimen?s damping ratio increases with frequency?s increasing. And when less than this frequency，gypsum specimen?s damping ratio decreases with frequency?s increasing. What?s more，the damping ratio of gypsum specimen inspired by P-wave is larger than that by S-wave.

Key words： rock mechanics damping ratio excitation mode forced vibration free attenuation frequency peak

Received: 07 September 2012

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/3258

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