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Study on the Stress Wave Propagation Attenuation Laws in the Elastoplastic Coal and Rock

Author: LiJianGong
Tutor: ChengGuoQiangï¼›ZouYinHui
School: Shandong University of Science and Technology
Course: Engineering Mechanics
Keywords: Acoustic emission stress wave Propagation attenuation law Coal and rock Waveguide Spherical wave Quality factor Rockburst
CLC: TD311
Type: Master's thesis
Year: 2008
Downloads: 157
Quote: 1
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Abstract


The Acoustic Emission predict coal or rock dynamic disasters non-contact development of a trend forecasting techniques . Paper the Tiger Mine 83001 ~ # two face acoustic emission to predict the impact pressure on the basis of the field test , the integrated use of theoretical analysis , numerical simulation and laboratory experiments and other research methods , focusing on the acoustic emission stress waves in coal intrusion and propagation in the waveguide attenuation law : (1) according to the live coal or rock dynamic disasters acoustic emission signal generation mechanism , assumed that the coal and rock mass is infinite elastic body , the use of acoustic emission spherical propagation model describes the stress wave propagation process , AE stress waves excited from the AE source wave equation and the derivation and analysis of AE stress wave propagation attenuation characteristics ; derived based on the quality factor Q theory is used to describe the stress wave propagation in the medium , the stress wave propagation attenuation equation obtained stress amplitude of the wave form of the negative exponential attenuation. (2) Coal the mass elastic and elastic-plastic medium model , international general-purpose finite element dynamic analysis software ANSYS / LS - DYNA coal rock mass stress wave propagation simulation derived acoustic emission stress waves in shells plasticity model attenuation faster than the elastic model , but the overall trend is the same, i.e. , as the propagation distance increases , the acceleration amplitude attenuation showed a negative exponential relationship . (3 ) the use of ANSYS / LS - DYNA software roadway loose Quannei Wai in the stress wave propagation process simulation , the simulation results combined with the quality factor Q theory shows that the fixed end of the waveguide must be set in the original elastic region . (4) from the numerical simulations and laboratory experiments two aspects of the acoustic emission stress wave propagation in the waveguide attenuation law . When the waveguide within the range of 5mm to 40mm in diameter acoustic emission stress wave propagation has little effect : the length is greater than 1m waveguide acceleration amplitude absolute value of the overall negative exponential decays .

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CLC: > Industrial Technology > Mining Engineering > Mine the pressure and support > Theory of rock pressure > Situ rock stress
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