Density controllable type triaxial sample preparation device for soil engineering

The utility model relates to a density controllable type triaxial sample preparation device for soil engineering, which can effectively solve the problems of non-uniform vertical test samples and incomplete test sample appearance. According to the technical scheme, a pressure framework adopts a framework structure formed by a lower disc, an upper disc and stand columns vertically mounted between the two discs, wherein a vertical spiral shaft is mounted on the upper disc, a press plate is mounted at the end part of the lower part of the spiral shaft, a jack is vertically fixed on the lower disc, a sample preparation mold is mounted on the jack and adopts a hollow structure with an opening in the upper part, cylinders provided with brims are mounted at the upper opening part of the sample preparation mold, each cylinder provided with the brim adopts an integrated structure formed by a top brim and a cylinder mounted below the top brim, the top brim is clamped at the upper opening part of the sample preparation mold, the cylinder extends into a cavity of the sample preparation mold, and a cavity between the lower end surface of the cylinder and the bottom surface of the sample preparation mold forms test sample pressing space. According to the density controllable type triaxial sample preparation device, through matching of a guide cylinder and the iron cylinders provided with the brims and having different heights, uniform layering sample preparation of triaxial test samples is realized, and a controllable triaxial sample preparation method is provided.