The invention discloses a uniaxial
creep testing device and a uniaxial
creep testing method for frozen earth with a
temperature gradient. The device consists of a pressure cover, a height adjusting
cushion block, a convex pedestal, an upper refrigerating plate, a lower refrigerating plate and heat insulation plates, wherein a
piston and a vacuumizing channel are arranged at the upper part of the pressure cover in a sliding way, and refrigerating fluid circulating channels and a test lead wire channel are formed in the convex pedestal. In the testing process, the heat insulation plate, the lower refrigerating plate, a sample, the upper refrigerating plate, the heat insulation plate and the pressure cover are sequentially mounted on the convex pedestal, and the space between the convex pedestal and the pressure cover is sealed by an O-shaped seal ring; an adiabatic boundary condition required by the sample is realized by vacuumizing in the pressure cover; the vertical
temperature gradient of the sample is realized by regulating
cold medium temperatures in the upper refrigerating plate and the lower refrigerating plate; and a
creep load required by the sample is realized by regulating the forced direction and size of the
piston. According to the uniaxial
creep testing device and the uniaxial
creep testing method, a unidirectional stress state and the stable adiabatic boundary condition can be provided, and the device and the method are suitable for research of uniaxial creep characteristics of the frozen earth under the conditions of different temperature gradients and scales.