Upamanyu Suryadevara 17496575

7/30/2019 Upamanyu Suryadevara 17496575

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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



2

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.



3

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



4

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



5

Graph: Horizontal Displacement VS Vertical Displacement

6.00 43 -71 117.2 -129 135.8 -79



6

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



7

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



8

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



9

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



10

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



11

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



12

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)



-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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Upamanyu Suryadevara 17496575