Abstract
Dynamic tests of dry clay were carried out to identify the parameters of the soil medium model of S.S. Grigoryan. To study the dynamic compressive strength under a uniaxial stress in the samples, the experiments were carried out on a PG-20 setup that implements the classical SHPB method. The modified SHPB method with a sample in a rigid holder was used in tests under conditions close to one-dimensional deformation. Based on the results of these experiments, the compressive strength of clay was determined at various strain rates up to 1200 1/s. In experiments with uniaxial deformation in the range of longitudinal stresses up to 400 MPa, strain diagrams, compressibility curves, and pressure dependences of the yield stress were obtained. The analysis of the results showed that the strain rate has practically no effect on the course of the strain diagrams and compressibility curves of the studied soil. The shear strength of the studied soil obeys the Mohr–Coulomb law both under loading and unloading. Based on the results of the experiments, the parameters of the mathematical model of S.S. Grigoryan for dry clay were obtained. Using this model in the LS-Dyna software package, the process of sample deformation was simulated under conditions corresponding to a real experiment. A good agreement between numerical and experimental results is obtained. To verify the model of the soil environment, model experiments were carried out on the penetration of conical tips into dry clay in a reversed formulation. Using this identified model in the LS-Dyna software package, numerical simulation of penetration was carried out under conditions similar to those carried out using the reversed experiment. Comparison of the results of model and numerical experiments showed their satisfactory agreement at a dry friction coefficient of 0.5.
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This work was supported by the Russian Science Foundation (grant no. 22-19-00138).
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Balandin, V.V., Balandin, V.V., Bragov, A.M., Igumnov, L.A., Konstantinov, A.Y., Kotov, V.L. (2023). Identification and Verification of the Soil Medium S. S. Grigoryan’s Model for Dry Clay. In: Altenbach, H., Eremeyev, V. (eds) Advances in Linear and Nonlinear Continuum and Structural Mechanics. Advanced Structured Materials, vol 198. Springer, Cham. https://doi.org/10.1007/978-3-031-43210-1_2
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