A probe to the morphological bionic design of desert subgrade slope structure
In order to reduce the sand accumulation of highway subgrade in desert areas,a subgrade slope structure with excellent sand transport performance is necessary.Inspired by the unique structure of sand dunes in their natural state,the crescent-shaped sand dunes were used as the bionic research object,and the bionic design concept is used to construct the suitable roadbed slope structure in the desert area.Based on the statistical characteristics of dune morphology,a theoretical mathematical model and finite element numerical simulation model of imitation dune surface subgrade are established,the interaction characteristics of wind and sand flow under different slope morphologies are analyzed,and the structure form of imitation dune subgrade is optimized,and a bionic subgrade slope structure suitable for desert areas is proposed.Compared with the conventional linear roadbed slope structure,the imitation dune-shaped roadbed slope structure has obvious advantages in the recovery of windward slope,pavement and leeward slope speed,which can make the sand grains obtain greater kinetic energy,accelerate the passage of sand grains through the subgrade,and reduce the deposition of sand grains around the subgrade.The sand accumulation and pavement sand grain volume fraction on the optimized concave curved imitation sand dune subgrade slope structure are significantly reduced,which can make the aeolian sand flow quickly pass through the subgrade,facilitate construction,and have good sand transport capacity.The research results can provide a reference for road safety operation and subgrade slope structure design in desert areas.
sand dunesbionic designsubgrade slopewind sand two-phase flowflow field distribution
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