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Shear Test Experiment Lab Report

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KNOWLEDGE OF EQUIPMENT:
A schematic diagram of the direct shear test apparatus is shown in Figure 9.2. The test equipment consists of a metal shear box in which the soil specimen is placed. The soil specimens may be square or circular. The size of the specimen generally used is about 20 to 25 cm2. The force on the specimen is applied from the top of the shear box. A proving ring is used to indicate the shear load. Shear force is applied by moving one half of the box relative to the other to cause failure in the soil specimen.
9.2.3 Required Measurements
14. Dimensions of shear box
15. Weight of empty shear box, Wsb
16. Weight of shear box and soil specimen, Wsbs
17. Proving ring constant, PRC
18. Elapsed time ince start of test, ti
19. Proving …show more content…

Weigh the shear box full of soil, Wsbs.
12. Calculate weight of soil filling the shear box, Ws = Wsbs – Wsb.
13. Calculate the density of the soil
14. Make the surface of the soil in the shear box plane.
15. Carefully place the upper gripper plate/stone and loading block on top of levelled soil in the shear box.
16. Carefully position the load cart on the direct shear box making sure it is well seated and lower the loading frame into its place.
17. Put a dial gauge on top of the loading frame to measure the vertical displacement of the specimen and another dial gauge to measure the horizontal displacement of the upper shear box half.
18. Advance the load screw until the dial gauge of the proving ring begins to move. Immediately stop the advancement and back off the load screw slightly.
19. Advance the separation screws in the upper shear box clockwise until they touch the lower half. Then advance each of them very slightly to separate the shear box halves and create the shear plane.
20. Zero all gauges and prepare to begin the test
C. The Test
21. Remove the shear pins from the shear box.
22. Apply the desired normal load carefully. Be careful that the free-hanging hanger and loading frame do not swing or rotate on applying the normal …show more content…

Add 5 kg normal stress 0.5 kg/cm2 and continue the experiment till failure
Clay
3. Remove the sample after failure.
4. On failure, stop the motor and reverse the load screw. Remove sample in the most convenient manner being careful not to lose the shear pins or damage the shear box.
5. Using compressed air and stiff brittle brushes, clean all pieces and reassemble the shear box apparatus for another test.
6. Set the dial gauges to zero, before starting each experiment
7. Add 5 kg normal stress 0.5 kg/cm2 and continue the experiment till failure
8. Set the dial gauges to zero, before starting each experiment
Repeat the test at least two more times and record the results in tabular forms as shown.

9.4.1 CALCLATIONS
1. Normal displacement, δv δv = (dial gauge reading in divisions) x (units per division) 9.2
2. Horizontal displacement, δh δh = (dial gauge reading in divisions) x (units per division) 9.3
3. Corrected cross-sectional area, Ac
Ac = W (L - δh) 9.4 where W = width of shear box
L = length of shear box (measured in the direction of travel)
4. Shear or displacement force, F
F = (proving ring reading in divisions) x (proving ring constant) 9.5
5. Shear stress, τ τ = F/Ac

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