Study on the Grouting Filling Reconstruction Mechanism of Floor Aquifer Considering the Time-varying Grout Viscosity
Grouting is one of the main technical means to prevent water inrush disaster of aquifer in coal seam floor.By grouting reconstruction of floor limestone aquifer,it can be changed into water barrier or weak aquifer,which can effectively cure floor water damage and realize safe and efficient mining.In this paper,based on Bingham grout,a one-dimensional seepage grouting theoretical model with time-varying slurry viscosity under constant grouting rate was established.The quantitative relationship between the diffusion distance and grouting pressure of fissure grout was analyzed.The diffusion law of horizontal fis-sure grout was studied,and the diffusion mechanism of horizontal fissure grout was revealed.In this mod-el,the grouting pressure required for a predetermined grout diffusion radius can be obtained by using known aquifer hydrostatic pressure and grouting flow.Finally,combined with the field grouting recon-struction project of L1-2 limestone aquifer in Zhaojiazhai 22 mining area,the research results were veri-fied.The results of grouting reinforcement and reconstruction show that the gronting quality meets the de-sign requirements,and the L1-2 limestone aquifer is effectively reconstructed.
fractured aquiferbingham fluidviscosity time variationslurry diffusiongrouting filling
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