Soil ex-situ mechanical parameter fidelity test method and device

The invention provides a soil ex-situ mechanical parameter fidelity test method and device, and relates to the field of material performance tests.The method comprises the steps that a polyisocyanate-polyol copolymer solution is placed in an electric mixing box; controlling a pressure pump type drilling barrel to drill towards a target soil body, and starting an electric mixing box, so that the copolymer solution is input into the pressure pump type drilling barrel; in the drilling process, the copolymer solution is controlled to flow into a gap between the target soil body and the pressure pump type drilling barrel according to preset parameters from the pressure pump type drilling barrel; stopping drilling of the pressure pump type drilling cylinder, closing the electric mixing box, standing for a period of time, solidifying the copolymer solution, and forming a sealed wrapping layer around the target soil body in the pressure pump type drilling cylinder, so as to obtain an undisturbed soil sample; the undi