EFFECT OF THE MASS FRACTION OF ICE ON THE STRAIN RATE DEPENDENCE OF STRENGTH UNDER DYNAMIC FRACTURE OF FROZEN SOIL
V. V. Balandin1,2, N. S. Selyutina2,3, Yu. V. Petrov1,2,3
1Research Institute of Mechanics, Nizhny Novgorod, Russia
2Institute for Problems of Mechanical Engineering, Russian Academy of Sciences, Saint-Petersburg, Russia
3St. Petersburg State University, Saint-Petersburg, Russia
Keywords: мерзлый песчаный грунт, прочность, скорость деформации, массовая доля льда, frozen sandy soil, strength, strain rate, mass fraction of ice
Abstract
Experimental dependences of the strength of frozen sandy soil on strain rate are analyzed using a structural-temporal approach. Results of dynamic uniaxial compression tests at a temperature of -18oC and strain rates of 400 to 2600 s-1 of frozen sandy soil samples of two types with a mass fraction of ice of 10 and 18% measured at room temperature are presented. The strain rate dependence of the at different temperatures of freezing of frozen sand with a mass fraction of ice of 30% was studied using known experimental data.
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