| Citation: | KONG Yue, LI Min, CHEN Weiminet al. Precision of crack moment-tensor inversion in porous media using finite element method[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(6): 1114-1121. doi: 10.13700/j.bh.1001-5965.2018.0560(in Chinese)
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The monitoring method for the dynamic growth of cracks, which is based on the moment-tensor theory, utilizes the acoustic-emission signal of crack opening to obtain the information of cracks. The pore in media has an effect on the accuracy of monitoring results. The two-dimensional plane strain finite element method (FEM) was applied to build the numerical model with pore involved. The inversion results for specific cracks in media with different poriness were provided and the mechanism was analyzed. The numerical results show that the double-couple component is more sensitive to poriness than the other two components. For pure shear cracks, the proportion of double-couple component decreases with the increase of the poriness. For isotropic and pure tensile cracks, the proportion of double-couple component increases with the increase of the poriness. The reason is the wave scattering of pore changes the spatial distribution of elastic-wave amplitude and the effect contains the two aspects. The energy transfer results in the fact that the wave amplitudes of different directions become closer to each other. Meanwhile, the difference of pore distribution increases the difference between the wave amplitudes of different directions. The effect of pore on inversion results varies for different cracks, because the weight of the two aspects is different.
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