ABSTRACT:

In order to obtain the Acoustic Emission (AE) characteristics before the peak stress, AE tests under uniaxial compression of phyllite samples were carried out. Results show that there are have extension and shear failure modes. The method of the lack-of-earthquake was used to analyze the AE characteristics. The phenomenon of the lack-of-earthquake appears remarkably before the peak stress compared with other lack-of-earthquake stages. The relationship between failure mode and the lack-of-earthquake was also discussed. The lack-of-earthquake can be used as a new method on prediction of peak stress.

1 INTRODUCTION

Because acoustic emission can reflect the evolutionary process of the brittle material such as rock and concrete, acoustic emission is widely used in monitoring the stability of underground and slope rock engineering. In the research field of acoustic emission, as the rock sample in compression process of acoustic emission will sent out a large number of signal, and there's some difficulty in getting full waveform, parameters analysis is more widely used in analyzing the acoustic emission signal than waveform analysis.

Lack-of-earthquake analysis is a way of earthquake prediction, it means the reflection of seismic activity law in the time distribution, it says the low level of seismic activity in the previous stage has accumulated a certain amount of strain energy, but it doesn't occur when it should has a larger earthquake temporarily. In view of characteristics of lack-of- earthquake analysis method, In this paper, based on a uniaxial compression process acoustic emission testing of phyllite, quoted the lack-of-earthquake analysis method, and analyzed the lack-of-earthquake phenomena before the peak stress in view of phyllite specimens with different failure modes.

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