... Apparatus, machine, it usually adopts four specimens under the different...... ZJ Light-duty Strain Controlled Direct Shear Apparatus, machine, ... strength of soil specimen, it usually adopts four specimens under the different vertical pressure(400kpa, 300kpa, 200kpa,100kpa,50kpa ... coefficient, angle of internal friction and coagulable force of the soil. Specification: 1.specimen area:30cm2*20cm(H) ...