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S o i l E n
g i n e e r i n g
P r a c t i c a l R e p o r t : S h e a r b o x t e s t
N a m e : U p a m a
n y u S u r y a d e v a r a
S t u d e n t I D : 1 7
4 9 6 5 7 5
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Objective: The objective of the shearbox test on sand is to determine the
ultimate shear strength parameters of the different soil samples taken
using the shearbox test.
Procedure:
Measure the inner dimensions of the given shearbox and calculate
the volume, also weigh the empty box and note down the readings
Loose sample: For the shearbox test on the loose sample the sand is
poured into the box evenly and gently until the brim of the box,
vibrations and other compaction causes should be avoided. Weigh
the soil sample and the box and take readings.
Dense sample: For the shearbox test on the dense sample the sand
should be poured into the box and compacted using 25 blows of the
hammer provided. Weigh the soil sample and the box and take
readings.
Transfer the shearbox to the loading frame and remove the screws
holding the upper and lower parts of the shearbox after the
appropriate normal loads have been applied. In this experiment we
are using normal loads at 5kg, 25kg and 50kg. Engage the clutch on the loading frame and switch the motor on.
Record readings of the vertical dial gauge and proving ring for every
0.25mm of displacement in Datasheet 10, this should be done for
both loose sample and dense sample separately.
Repeat the above the steps on different normal loads and different
soil samples.
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Readings:
Dimensions of box: 60.00 x 60.00 x 45.00
Volume: 162m³ Weight of empty box: 3.172 Kg
Weight of box with soil sample: 3.420 Kg
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Datasheet 10: Loose Sample
Area of sample (mm²): 3600
Proving Ring No.: 47
Calibration constant (N/div): 2.344
Test # 1 2 3
Normal Load 5 25 50
Density of
sample
0.0015 0.0015 0.0015
Horizontal
displacement
Prov.
Ring
reading
Division
Vertical
Displ.
(mm)
Prov.
Ring
reading
Division
Vertical
Displ.
(mm)
Prov.
Ring
reading
Division
Vertical
Displ.
(mm)
0.00 0 0 0 0 0 0
0.25 15 -19 40 -15 30 2
0.50 15 -20 40 -15 52 -3
0.75 20 -28 40 -15 69 -15
1.00 26 -49 55 -26 81 -28
1.25 29 -67 65 -41 91 -41
1.50 32 -78 74 -59 97 -51
1.75 34 -86 81 -72 103 -59
2.00 35 -91 86 -83 107 -62.5
2.25 36 -95 90 -93 109 -66
2.50 37 -99 93 -103 111 -69.5
2.75 38 -99 97 -110 114 -72
3.00 39 -99 98 -115 116 -73.5
3.25 39 -99 102 -117 119 -74.5
3.50 39.5 -99 104 -119 120 -75
3.75 40 -98 106 -124 122 -75.5
4.00 40.3 -94 108 -128 124.5 -76.5
4.25 41.3 -91 111 -130 127 -77
4.50 41.8 -88.5 112 -130 129 -78
4.75 42 -88.5 114 -130 130.5 -78.5
5.00 42.5 -85 115 -130 133 -79
5.25 42.5 -83 116 -130 134 -79
5.50 42.9 -77 116.5 -129 135 -79
5.75 43 -75 116.9 -129 135.5 -79
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Graph: Horizontal Displacement VS Vertical Displacement
6.00 43 -71 117.2 -129 135.8 -79
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Datasheet 11: Loose Sample
0
0.2
0.4
0.6
0.8
1
1.2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
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Test No. 1 2 3
Normal Stress 13.625 68.125 136.25
Horizontal
Displ. (mm)
Shear
stress(KPa)
Stress
Ratio
Shear
stress
(KPa)
Stress
Ratio
Shear
stress(KPa)
Stress
Ratio
0.00 0 0 0 0 0 0
0.25 9.77 0.718 26.04 0.382 19.5 0.143
0.50 9.77 0.718 26.04 0.382 33.86 0.248
0.75 13.02 0.957 26.04 0.382 44.92 0.33
1.00 16.93 1.244 35.81 0.525 52.74 0.387
1.25 18.88 1.388 42.32 0.621 59.25 0.435
1.50 20.84 1.532 48.18 0.707 63.16 0.464
1.75 22.14 1.627 52.74 0.774 67.06 0.440
2.00 22.79 1.675 56.00 0.822 69.67 0.512
2.25 23.44 1.723 58.60 0.860 70.97 0.5212.50 24.09 1.771 60.55 0.889 72.27 0.531
2.75 24.74 1.819 63.16 0.927 74.23 0.545
3.00 25.39 1.866 63.81 0.937 75.53 0.555
3.25 25.39 1.866 66.41 0.975 77.42 0.569
3.50 25.72 1.891 67.72 0.994 78.13 0.574
3.75 26.04 1.914 69.02 1.013 79.44 0.584
4.00 26.24 1.929 70.32 1.032 81.06 0.596
4.25 26.89 1.977 72.27 1.601 82.69 0.608
4.50 27.22 2.001 72.92 1.070 83.99 0.617
4.75 27.35 2.011 74.23 1.090 84.97 0.6245.00 27.67 2.034 74.88 1.099 86.59 0.636
5.25 27.67 2.034 75.53 1.109 87.25 0.641
5.50 27.90 2.051 75.85 1.113 87.9 0.646
5.75 28 2.058 76.11 1.117 88.23 0.648
6.00 28 2.058 76.31 1.120 88.42 0.650
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Graph: Horizontal Displacement VS Shear stress
Graph: Horizontal Displacement VS Stress ratio
0
10
20
30
40
50
60
70
80
90
100
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
0
0.5
1
1.5
2
2.5
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
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Datasheet 10: Dense Sample
Area of sample (mm²): 3600
Proving Ring No.: 130
Calibration Constant (N/div): 0.703
Test # 1 2 3
Normal Load 5 25 50
Density of
sample
1.713 1.713 1.713
Horizontal
displacement
Prov.
Ring
Reading
division
Vertical
Disp.
(mm)
Prov.
Ring
Reading
division
Vertical
Disp.
(mm)
Prov.
Ring
Reading
division
Vertical
Disp.
(mm)
0.00 0 0 0 0 0 0
0.25 -17 -15 86 -47 100 -20
0.50 34 -15 139 -62 180 -19
0.75 63 -15 165 -63 270 -16
1.00 77 -14 200 -63 353 -15
1.25 85 -9 236 -63 415 -14
1.50 95 -2 278 -74 495 -10
1.75 104 12 304 -74 556 3
2.00 110 27 345 -86 598 22
2.25 119 55 374 -81 618 462.50 120 93 406 -69 622 75
2.75 120 117 438 -53 616 105
3.00 118 117 472 -34 598 136
3.25 115 144 485 -9 574 163
3.50 112 156 488 20 549 187
3.75 108 168 480 47 512 208
4.00 105 180 462 70 495 221
4.25 101 185 434 81 475 231
4.50 98 187 400 96 465 236
4.75 95 190 377 105 460 2415.00 94 192 356 111 459 245
5.25 94 196 352 115 449 247
5.50 92 198 352 118 449 249
5.75 91 198 350 121 451 251
6.00 91 197 349 123 455 251
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Graph: Horizontal displacement VS Vertical Displacement
-150
-100
-50
0
50
100
150
200
250
300
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
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Datasheet 11: Dense sample
Test no. 1 2 3
Normal stress 13.625 68.125 136.25
Horizontal
Displ.
Shear
stress
(KPa)
Stress
Ratio
Shear
stress
(KPa)
Stress
Ratio
Shear
stress
(KPa)
Stress
Ratio
0.00 0 0 0 0 0 0
0.25 -2.34 -0.17 16.8 0.25 19.5 0.14
0.50 6.63 0.48 27.1 0.4 35.2 0.26
0.75 12.3 0.9 32.2 0.47 52.7 0.39
1.00 15.04 1.1 39.1 0.57 68.9 0.5
1.25 16.6 1.22 46.1 0.68 81.0 0.59
1.50 16.55 1.14 54.3 0.8 96.66 0.71
1.75 20.3 1.22 59.4 0.87 108.57 0.79
2.00 21.48 1.36 67.4 0.99 116.78 0.86
2.25 23.24 1.79 73.0 1.07 120.68 0.88
2.50 23.43 1.6 79.3 1.16 121.46 0.89
2.75 23.43 1.6 85.5 1.25 120.3 0.88
3.00 23.04 1.72 92.2 1.35 116.78 0.86
3.25 22.46 1.6 94.7 1.39 112.09 0.82
3.50 21.87 1.64 95.3 1.4 107.2 0.78
3.75 21.09 1.54 95.7 1.41 99.98 0.73
4.00 20.5 1.5 90.2 1.32 96.66 0.71
4.25 19.72 1.44 84.8 1.25 92.76 0.68
4.50 19.13 1.4 78.1 1.146 90.80 0.67
4.75 18.55 1.36 69.5 1.02 89.83 0.66
5.00 18.37 1.34 69.5 1.02 89.63 0.66
5.25 18.37 1.34 68.7 1.005 87.68 0.64
5.50 17.97 1.38 68.7 1.005 87.68 0.64
5.75 17.77 1.304 68.4 1.004 88.07 0.65
6.00 17.77 1.304 68.2 1.001 88.85 0.65
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Graph: Horizontal displacement VS Shear stress
Graph: Horizontal displacement VS Stress Ratio
-20
0
20
40
60
80
100
120
140
1 3 5 7 9 11 13 15 17 19 21 23 25
5 Shear stress (KPa)
25 Shear stress (KPa)
50 Shear stress (KPa)
-0.5
0
0.5
1
1.5
2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
5 Stress Ratio
25 Stress Ratio
50 Stress Ratio
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