Abstract:The specimens of frozen clay are used for carrying out the long-term creep tests under triaxial stress states so that the creep curves of the frozen clay are derived. According to the testing results, the nonlinear creep equation is proposed to describe the nonlinear creep property of frozen clay at different temperatures. By means of regression analysis, the values of creep parameters of frozen clay are obtained. The developing regularity of the viscoplastic region is approached with the aid of rhelogical theory of frozen soil and a formula is derived to calculate the thickness of frozen wall. At the same time the available methods are set forth to prevent fracture of the frozen pipes.