Analysis of Grouting Mechanism Considering the Natural Structure of Sandy Soil
The sand layer has typical heterogeneity and in-situ variability,and there is a fluid solid coupling effect between the slurry and the sand layer during the grouting process.Combining randomness with fractal theory,a physical model considering the spatial variability of sand mechanical performance parameters was constructed based on the Diamond square algorithm.A refined fluid solid coupling multi physical field model was used to ana-lyze the diffusion law of slurry in sand media,and the stress and deformation characteristics of sand under load be-fore and after grouting were discussed.Research has shown that the sand random fractal model constructed in this article can reflect the differences in geological information conditions of the strata,and accurately reveal the basic laws and characteristics of sand grouting under complex stress and structural states.The slurry diffuses in an irregu-lar shape along the depth of the hole,and the effective diffusion radius of the slurry varies at different depths.The diffusion changes and effective filling range of the slurry are highly consistent with the fractal structure of sand.Be-fore grouting reinforcement,the sand soil structure was loose and the stress transmission method was single.After re-inforcement,the sand soil cemented to form a secondary structure,causing stress concentration during the load trans-fer process,and the bearing potential of the sand soil was fully utilized.Grouting reinforcement reduces the settle-ment deformation of the sandy soil layer and significantly improves the physical and mechanical properties of the sandy soil.
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