Mount the loading yoke on the steel ball, placed on the loading block, and hang 10 kg normal load.Ħ. Place the box in its proper position on the shearing machine.ĥ. Carefully place the sample in the shear box and insert the upper loading block in place.Ĥ. Fix the upper part of the shear box to the lower part in saturation container and insert the lower block.ģ. Prepare at least three samples with the help of sample trimmer.Ģ. If specimens of compacted soil are used, they shall be compacted to the desired moisture density conditions. Trim oversize specimens to the inside diameter of the direct shear device and to the length of the trimmer.Įxtreme care shall be taken in preparing undisturbed specimens of sensitive soils to prevent disturbance of their natural structure.ĭetermine the initial mass of the specimen for subsequent use in determining initial moisture content. Micrometer dial gauge to measure horizontally & vertically displacement during shear.Ħ. Proving ring with dial gauge accurate to 0.002 mm to measure the shear force.ĥ. Loading frame, to distribute the load from the yoke over the specimen normal to the shear plane.Ĥ. The box should be divided into two parts horizontally, with suitable spacing screws.Ĭ) Grid plates two pairs, one pair plain and another pair perforated.Į) Base plate with cross grooves on its top face to fit into the shear box.į) Loading pad with a steel ball on its top.Ģ. Standard:Ī) Shear box, 60 mm square & 50 mm deep so that sample of size 60 x 60 x 20 mm may be tested. You must understand the nature of shearing resistance in order to analyze the soil stability problems such as īearing capacity, slope stability and lateral pressure on the earth retaining structures. To familiarize the young Engineers with a procedure for rapidly estimating the shear strength Parameters (angle of friction and cohesion) of a soil sample. This information is necessary for substructure analyses, in determining the bearing capacity of the soil, in stability calculations of earth slopes, in pile driving, and other earthworks. The purpose of the direct shear test of soil is to obtain its ultimate shear resistance, its angle of internal friction, its cohesion, and its shear stress deformation characteristics. Read Also: Proctor Test Its Apparatus, Procedure, Result.
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