Using method of temperature-time analogy to determine long-term strength of frozen soil in triaxial compression

The method of time analogy is based on the intensification and loss of strength during deformation process. There are many factors accelerating creep speed of frozen soil, such as rise of temperature, increase in stress, change of physical properties as well as increase in the contents of salt, ice, peat, etc. The influence of time on rheological behaviour of frozen soil is analogical to that of these factors. The creep and strength test results give a possibility to determine the ratio between the times reaching the same strength for different temperatures or other influencing factors. This ratio is called the time transfer coefficient. Roman (1987) had presented the principle of using the time analogy methods (such as time-temperature, time-stress and time-salt content emthod) to determine long-term strength and deformation of frozen soil. Among these methods, the time-temperature method is better one. The principle of using the time-temperature method to determine the long-term strength of frozen soil under triaxial stress is discussed in this paper.