Two-sided estimations of resistance to penetration of a cone into frozen ground

Data of an experiment to determine the ultimate strength of frozen soil under uniaxial compression in the range of deformation rate values 400–2700 s$^{-1}$ are presented. Final expressions are obtained for the coefficients of the quadratic approximation that depend on the impact velocity of the stress normal to the surface of the striker and the experimentally determined physical and mechanical parameters of the soil – shock adiabat and the dynamic strength in compression. The obtained formulas are verified on the basis of comparison with the known data of experiments on the introduction of a steel conical striker into frozen sandy soil. It is shown that the difference between the results of bilateral evaluations and experiments does not exceed 15%.