Metering type capillary water replenishing device of open frost heaving experiment system

The utility model discloses a metering type capillary water replenishing device of an open frost heaving experiment system, which comprises a support frame and a sample box arranged on the support frame, and further comprises a water tank with an upward opening, the water replenishing assembly comprises a power sponge and an adjusting sponge, the power sponge and the adjusting sponge are arranged on the supporting frame, the bottom surface of the power sponge extends into the water tank, a permeation through hole is formed in the bottom surface of the sample box, the sample box, the adjusting sponge and the power sponge are sequentially attached from top to bottom, and the pore of the power sponge is smaller than that of the adjusting sponge; the metering assembly comprises a weight scale, the water tank is placed on the weight scale, the weight scale is used for measuring the mass of the water tank, the requirement for stable, quantitative and controllable water replenishing conditions of the warm end of ope