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- W2384966709 abstract "Acoustic emission( AE) tests of coal specimens under triaxial compression condition were carried out with AE detector inside the triaxial chamber based on remodelling communication interface of MTS815 rock mechanical test system,overcoming the disadvantages of being unable to monitor the comprehensive and reliable AE signals as the AE detector installed outside the triaxial chamber wall of the rock mechanical test system. Compared with uniaxial compression test,the results of AE tests of coal specimens under triaxial compression show that the integrity and stiffness of the specimens are raised by the confining pressure and the AE activities decrease significantly in the stage of compaction. The time of the AE counts and the AE energy reaching their highest values relatively lags behind the moment of the macroscopic failure of the specimens,which draws the conclusion that the confining pressure can improve not only the specimens' peak strength but also their bearing capacity after peak stress,because the dislocating and slipping of the internal fractures are restricted by the confining pressure.Amplitude reflects the strength of AE,under triaxial compression condition,the AE amplitudes are relatively low at the initial stage of axial loading,and a large number of AE events with very high amplitudes appear around the moment of the macroscopic failure of the specimens,but there are still a lot of AE events occuring with relatively high amplitudes in the residual plastic deformation stage. The number of AE impact count rates reflects the unmber and rate of the crack propagation,test results of AE impact counts under triaxial compression show that the elastic-plastic stage is the major stage of the inside fractures' producing and developing of coal specimens. The results of AE characteristic of rock damage failure under triaxial compression are of important theoretical and practical guiding significance for deeply understanding the failure mechanism of rock mass,and preventing the related dynamic disasters underground mines by micro seismic monitoring technology." @default.
- W2384966709 created "2016-06-24" @default.
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- W2384966709 date "2015-01-01" @default.
- W2384966709 modified "2023-09-23" @default.
- W2384966709 title "Acoustic Emission Characteristics of Coal Damage Failure Under Triaxial Compression" @default.
- W2384966709 hasPublicationYear "2015" @default.
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