The Study Of The Mechanical Properties Of The Acoustic Emission Parameters Of Rocks

In recent years, Acoustic Emission in this field of monitoring method is economic and effective, and can also be convenient to get a lot of reliable measured data. The relative study on the study of the mechanical properties of the Acoustic Emission parameters of rocks, always had been received trusty results, and we need a lot further analysis and research.In my paper, on the one hand, by studying analysing the three kinds of limestone, sandstone and granite rock, with the uniaxial compression methord, I monitor the data of rocks and the cumulative number of acoustic emission, the cumulative number of the accumulative AE ringing and the cumulative number of AE energy, for purpose of finding the relevance between them. On the other hand, through one-way shear of the indoor test of limestone friction,I analyze the relationship of between cohesive force, angle of internal friction and the Acoustic Emission, in order to find the relative characteristics with them. With WAW- 1000 uniaxial presstion by producted Shanghai hualong company and the Acoustic Emission testing instrument and the corresponding control system composed of a complete set of equipments of 12 channels and the physical acoustics company is in the United States. With Shanghai HuaLong WAW- 1000 production,I press rock uniaxially, all at once, with 12 channels of PAC Acoustic Emission testing instrument, and monitor the data of the Acoustic Emission.Tests three kinds of rocks sample are proceeded mainly in natural state, saturated state, different loading modes, to observe and discuss the relevance of the compressive stress and acoustic emission features; Natural limestone are carried out, discuss, with one-way shear tests of Shanghai HuaLong company WHY- 5000 production, in order to find out the relevance of cohesive force, internal friction and the Acoustic Emission.Through analyzing the number of data and the Acoustic Emission data in uniaxial compression tests, I find the following results:(1) The AE parameters from AE curve can be identified as the rock several stages of the pressure close to the destruction, with the stress increasing, AE data increase, and before the damage, AE rate will increase abruptly and provide early warning for rock mass damage;(2) Before destruction, AE curve of granite has obvious quiet period, which is based on the AE curve parameter, providing test certificate for mass failure warning of granite rock;(3) Coordinate positioning events reflect rock internal crack location and the direction, for predicting the position of the rock failure surface.Research results are expected to provide rock mechanics parameters for a new indirect method, with strong engineering application prospects.