Automatic Direct/residual large shear box machines are used to measure the shear strength properties of soil. It is ideal for soil and other materials that contain large particles of up to 20 mm, as their largest dimension.
A Shear Box is used for direct shear testing of soil specimens to determine the shear strength of a soil sample. These shear box apparatus' divide horizontally, allowing the application of a vertical confining load to the specimen and horizontal shearing stresses to the lower half of the box.