Study on diffusion mechanism of viscosity time-varying slurry in unsaturated soil based on displacement effect

AbstractTaking Bingham slurry as the research object, an infiltration diffusion model of Bingham slurry in unsaturated soil is established based on the seepage theory of unsaturated porous media, which takes into account the displacement effect and the viscosity time-varying characteristics of slurry. Combined with the seepage motion equation, relevant boundary conditions and interface conditions, the Bingham slurry diffusion equation considers grouting parameters and mechanical parameters is obtained. The research results are degraded to the saturated state and compared with the existing theoretical results. Numerical examples are used to study the influence of the above parameters on grouting pressure and slurry diffusion radius, then the diffusion mechanism of Bingham slurry is verified and analysed by model test. The above analysis and test results confirm the effectiveness and applicability of the research results, which can provide reliable theoretical support and technical reference for the design and construction of grouting engineering in unsaturated soil areas.Keywords: Bingham slurrydisplacement effectviscosity time-varyingunsaturated soilinfiltration diffusion model AcknowledgementsThe authors are grateful to the reviewers for their insightful and constructive comments.Disclosure statementNo potential conflict of interest was reported by the authors.Data availability statementThe datasets generated during and/or analysed during this study are available from the corresponding author on reasonable request.Additional informationFundingThis work was supported by the National Natural Science Foundation of China (Nos. 11962016 and 51978320) and the Foundation for Innovation Groups of Basic Research in Gansu Province (No. 20JR5RA478).