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MPM-driven Dynamic Desiccation Cracking and Curling in Unsaturated Soils

Abstract

Desiccation cracking of soil-like materials is a common phenomenon innatural dry environment, however, it remains a challenge to model andsimulate complicated multi-physical processes inside the porousstructure. With the goal of tracking such physical evolution accurately,we propose an MPM based method to simulate volumetric shrinkage andcrack during moisture diffusion. At the physical level, we introduceRichards equations to evolve the dynamic moisture field to modelevaporation and diffusion in unsaturated soils, with which aelastoplastic model is established to simulate strength changes andvolumetric shrinkage via a novel saturation-based hardening strategyduring plastic treatment. At the algorithmic level, we develop anMPM-fashion numerical solver for the proposed physical model and achievestable yet efficient simulation towards delicate deformation andfracture. At the geometric level, we propose a correlating stretchingcriteria and a saturation-aware extrapolation scheme to extend existingsurface reconstruction for MPM, producing visual compelling soilappearance. Finally, we manifest realistic simulation results based onthe proposed method with several challenging scenarios, whichdemonstrates usability and efficiency of our method.