Determination of Dynamic-Compressibility Parameters and of Shear Strength for a Ground Medium by the Striker-Penetration Method

摘要

Study of the behavior of soft ground media within a wide range of pressures remains one of the problems of current interest in mechanics of a deformable solid. Traditionally, the determination of the deformation and strength properties of ground media is carried out experimentally with simultaneous measurements of the stress-strain-tensor components as functions of time. Field experimental studies of explosion waves in sandy grounds with disturbed and undisturbed structures at pressures below 100 atm were performed, e.g., in [1]. In dynamic tests [2] of ground samples in an elastic yoke supplied with tensile sensors, pressures attain on the order of 1000 atm. These experiments yield us valuable information on the compression and shear strengths of ground media. However, performing these experiments meets significant technical difficulties. In plane-wave experiments [2, 3], pressures of 104 atm had been attained but only compressibility (Hugoniot adiabat) of the ground medium was determined. Thus, efficient methods for studying the elastoplastic properties of ground media in a wide range of pressures have been absent up to now.