Test device and method for simulating anti-freezing and anti-pulling performance of pile foundation in slope permafrost region

The invention discloses a test device and method for simulating the anti-freezing and anti-pulling performance of a pile foundation in a slope permafrost region, the device comprises a closed environmental box, and a plurality of copper pipes are arranged at the top of the inner side of the environmental box at equal intervals and used for controlling the environmental temperature and simulating the temperature change of an active layer; a soil body model box is arranged on one side of the interior of the environment box, and a plurality of copper pipes are arranged at the bottom of the inner side of the soil body model box at equal intervals and used for simulating temperature changes of a permanent frost layer; a model pile is arranged in the middle of the soil body model box, and a plurality of strain gauges are arranged on the pile side of the model pile at certain intervals in the depth direction; a plurality of temperature sensors are arranged on the periphery of the model pile in the depth direction at