The invention discloses a vertical
direct shear test device. The vertical
direct shear test device comprises a base, a water injection
pipe and a water drainage
pipe, wherein a pressure chamber is arranged on the base, an upper cover of a shear chamber is arranged on the pressure chamber, a
rubber membrane sleeve is arranged in the pressure chamber, the lower end of the
rubber membrane sleeve is arranged on the base, the lower end of the
rubber membrane sleeve is hermetically connected with the base, an upper shear box and a lower shear box are arranged in the rubber membrane sleeve, the upper and the lower shear boxes are respectively positioned at the upper end and the lower end of the rubber membrane sleeve, a
test sample cavity is surrounded by the rubber membrane sleeve and the upper and the lower shear boxes, the upper and the lower shear boxes adopt shear components, each shear component comprises a substrate, the substrates are respectively provided with a shear block and a deformation block, the opposite planes of the shear block and the deformation block are coplanar with the shear plane of a
test sample, water grooves are arranged on the opposite planes of the shear block and the deformation block, the water grooves extend to the substrates and penetrates the substrates, water through holes are formed, the water injection
pipe is connected with the water through hole in the upper shear box, the water drainage pipe is connected with the water through hole in the lower shear box, a
top cap is arranged on the upper shear box, and the
top cap is provided with a vertical loading shaft.