Power-law fluid infiltration grouting mechanisms considering different particle size distributions
In this study,based on the fractal theory and the equation of power-law fluid seepage and motion in porous media,a theoretical model of power-law fluid infiltration grouting in porous media with different particle size distributions was derived,which was then verified by indoor tests and COM-SOL Multiphysics software.Meanwhile,the diffusion range of slurry was monitored by a parallel elec-tropneumatic apparatus,and model tests and numerical simulation analyses were carried out under differ-ent grouting pressures and porosities.According to the research results,excitation currents can clearly manifest seepage paths,and visual resistance imaging analysis can macroscopically monitor the diffusion range of slurry.In addition,the diffusion radius of power-law fluid in porous media considering different particle size distributions is smaller than that without this consideration,the average difference being 11.77%.Particularly,the diffusion radius considering different particle size distributions is closer to the measured value,and the influence of particle size distribution on the diffusion of slurry gets increasingly prominent with the rise of grouting pressure and porosity.The constructed theoretical model,capable of reflecting the infiltration and diffusion law of power-law fluid in porous media with different particle size distributions,was successfully applied to the pre-grouting reinforcement of the 1512(3)working face in the southern No.2 mining area of Gubei Mine,and the engineering practice effect turned out to be satis-factory.
different particle size distributionsfractal theoryporous mediapower-law fluidsinfil-tration grouting mechanisms
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维普
