Laboratory Testing of Frozen Soils 419 Deformation and failure of frozen soils and ice at constant and steadily increasing stresses

• Main Author: Anatoly M. Fish
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Proc. 4th Can. Permafrost Conf. (1982; Ice; permafrost
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.583.4687; http://pubs.aina.ucalgary.ca/cpc/CPC4-419.pdf

Experimental and theoretical studies were made of the deformation and time-dependent failure of ice. Uniaxial compression tests were performed in the laboratory at constant and steadily increasing stresses. Strength criteria and unified constitutive equations describing all three stages of creep at con-stant stress are presented. It is shown that regardless of the stress regime (constant stress or step load-ing) the equations describe deformation and time-dependent failure by five parameters. The forms of the constitutive equations, which can be applied also to describe the mechanical properties of frozen and unfrozen soils, make it possible to obtain analytical solutions of the practical problems and to determine the creep parameters of frozen and unfrozen soils and ice in situ. Des Ctudes exptrimentales et thkoriques ont Cte effectukes sur la deformation de la glace et sa rup-ture en fonction du temps. En laboratoire, ont etC rialis & des essais decompression uniaxiale en pre-sence d'efforts constants et augmentant rtgulitrement. Des crittres de resistance mecanique et des equations dktaillees uniformes sont prtsentes, decrivant les trois phases de fluage sous I'effet d'une contrainte constante. I1 est dCmontrC que, quel que soit le regime de contrainte (contrainte constante ou charge progressive), les equations dkcrivent la deformation et la rupture dtpendante du temps au moyen de cinq paramttres. Les formes des equations detaillees que I'on peut aussi employer pour dkrire les proprietis mecaniques des sols gel & ou non gelb, permettent de trouver des solutions analy-tiques aux probltmes pratiques et de determiner les paramttres de fluage des sols gelts, des sols non et de la glace in situ.