Describe Direct Shear Test with Neat Sketch.

Describe Direct Shear Test with Neat Sketch.
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Answer :

1. Take 250gm of dry sand in a shear box of 60mm x 60mm x 50mm and fix the upper part and lower part of box by locking screw and attach the base plate to lower part. 2. Place the grid plate above the base plate. 3. Fill the shear box with sand layer compact each layer with tamper. 4. Weight the remaining sand and by the difference find the sand required to fill the box. 5. Calculate the density of sand in the shear box and assemble the two halves of the box. 6. Place the box in the container and the container on the direct shear test apparatus. 7. Place the loading pad on the top and adjust the proving ring dial gauge reading to zero. 8. Mount loading yoke and dial gauge and apply a stress of 0.05N/mm2 to record vertical and horizontal displacement. 9. Remove locking screw and using spacing screw raised the upper part slightly above the lower part to create 1mm gap. 10. Remove spacing screw and apply a horizontal shear load of 1.25mm/min and record the reading for shear failure. 11. Plot the graph taking values of maximum shear on Y axis and normal stress on X axis. 12. The angle gives the shearing resistance and the intercept gives cohesion.

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