Study on After Peak Acoustic Emission Features of Rock Type Material

Based on the acoustic emission test system and the rock acoustic emission theory, the uniaxial compressive tests were made on two different property r ock and cement-sand grouts.The mechanics feature curve, the acoustic emission ringing numbers and the acoustic emission accumulated ringing number curve of full t hree sample failures' processes were obtained.A study in sections on the relationship between the deformation features and stress as well as the ringing number and ti me was conducted.The study showed that the acoustic emission of the rock type material would be affected by the rock strength, joint fissure and crystal grain hardnes s.The acoustic emission ringing number of the partial soft rock material at the elasticity and the elastic-plastic stage would be steadily increased in unit time and but wh en the rock material was near the peak strength, the acoustic emission occurred would be in a relative quiet phenomenon.The activity of the after peak acoustic emissio n would be mainly affected by the rock strength. The comparison on the acoustic emission features of the different rock failures could provide referen to evealuate the st ability of natural and artificial rock projects.