Study of Size Effect on Consolidation Behaviour

1. Study of Size effect in
Consolidation Behaviour
(Supervised by Dr. V. A. Sawant)
Godisela Srimanth
Shubham Kumar Meena
Satya Prakash Meena

2. Class Outlines
Consolidation
 Definitions & Introduction
 Consolidation vs Compaction
 Type of Consolidations
 Test Performed:-
 Liquid limit
 Plastic limit
 Hydrometer Analysis
 Consolidation

3. Consolidation - Definition
• Consolidation refers to the compression or settlement that soils
undergo as a response of placing loads onto the ground.
• These loads produce corresponding increases in the vertical
effective stress, sv’
• Consolidation is a time-dependent process, in some soils it may take
long time (100 years ?) to achieve complete settlement.

4. Consolidation vs. Compaction

5. Liquid Limit
The liquid limit is that water content of soil at which
it has infinitesimal shear resistance against flow which was measured
in Casgrande apparatus.
The value of liquid limit in our sample = 29.63 %

6. Apparatus

7. Container No. D30 Co9 d25
No.of Blows 10 23 30
Wt.of container
(Wo)ga
16.0g 17.0g 13.5g
Wt.of
container+wetsoil
(W1)g
24.5g 30g 24g
Wt.of
container+Oven dry
soil (W2)g
22.26g 27.620g 22.345g
Wt.of water (W1-
Wo)g
2.24g 2.38g 1.655g
Wt.of Oven dry soil
(W2-Wo)g
6.26g 10.62g 8.845g
Water Content (W) 35.78 22.41 18.71

8. Plastic Limit
The plastic limit of soil is the water content of soil at
which soil enters in semisolid state from plastic state .
The plastic limit of our sample =18.5%

9. Container No. G35 A6
Wt.of container (Wo)g 18.085g 20.98g
Wt.of container+wetsoil
(W1)g
5.230g 27.065g
Wt.of container+Oven dry
soil (W2)g
24.100g 26.13g
Wt.of water
(W1-Wo)g
1.13g 0.935g
Wt.of Oven dry soil (W2-
Wo)g
6.015g 5.15g
Water Content (W) 18.786 18.155

10. HYDROMETER ANALYSIS

13. Time (Min) Hydrometer Reading
0.5 26
1 25
2 23
4 20
8 17
15 15
30 13
60 11.25
2893 8
71.5 hrs 4

14. Consolidation
• Weight of ring = 106gm
• Weight of ring +weight of soil = 280gm
• Weight of soil = 174gm
• Dial reading before saturation = 6.40
• Height of ring = 2cm
• Volume of ring = 88.31cm3
• Diameter of ring = 7.5cm
• Dial reading after saturation = 6
• Dry weight of soil =226-106 = 120gm

15. TIME IN
MIN
25kN/msq
(2.5 LBS)
50kN/msq
(5 LBS)
100kN/msq
(10LBS)
200kN/msq
(20LBS)
400kN/msq
(40 LBS)
00 6 5.65 5.35 4.99 4.61
.25 5.95 5.62 5.28 4.86 4.50
1.00 5.93 5.60 5.21 4.82 4.34
2.25 5.89 5.57 5.12 4.77 4.36
4.00 5.87 5.53 5.09 4.73 4.33
6.25 5.84 5.50 5.06 4.72 4.32
9.00 5.81 5.48 5.05 4.70 4.31
12.25 5.8 5.47 5.03 4.69 4.30
16.00 5.79 5.46 5.09 4.69 4.30
20.25 5.78 5.45 5.05 4.68 4.30
36.00 5.77 5.44 5.03 4.67 4.30
1440 5.65 5.35 4.99 4.61 4.27

16. IED PER FINAL DIAL
GAUGE
READING (mm)
CHANGE IN
DIAL GAUGE
READING
(mm)
THICKNESS OF
SOIL SAMPLE
(H)
(mm)
EQUIVELENT
HEIGHT OF
VOIDS (H-
Hs)(cm)
VOIDS RATIO
e= H-Hs/Hs
6 _ 20 8 0.67
5.77 0.23 19.77 7.77 0.647
5.44 0.33 19.44 7.44 0.62
5.03 0.41 19.03 7.03 0.586
4.67 0.36 18.67 6.67 0.556
4.30 0.37 18.30 6.30 0.525

17. OEDOMETER TEST APPARATUS-:

19. Consolidation
• Weight of Apparatus = 2939gm
• Weight of ring +weight of soil = 4639gm
• Weight of soil = 1700gm
• Height of sample = 5 cm
• Volume of sample = 906.832cm3
• Diameter of ring = 15.2 cm
• Dry weight of soil =1843.5 gm

20. TIME IN
MIN
10Lbs 20Lbs 40Lbs 80Lbs 160Lbs
0.0 12.69 12.15 11.64 11.03 10.19
6 sec 12.48 11.99 11.48 10.72 9.62
0.25 12.46 11.95 11.36 10.69 9.60
1.00 12.42 11.93 11.33 10.61 9.55
2.25 12.40 11.91 11.30 10.57 9.52
4.00 12.39 11.89 11.28 10.55 9.50
6.25 12.36 11.87 11.27 10.53 9.48
9.00 12.35 11.87 11.25 10.48 9.46
12.25 12.35 11.86 11.24 10.43 9.43
16.00 12.34 11.85 11.23 10.41 9.41
20.25 12.33 11.84 11.22 10.41 9.39
36.00 12.29 11.81 11.19 10.37 9.33
49.00 12.28 11.79 11.16 10.35 9.29
60.00 12.27 11.78 11.14 10.33 9.27
24 Hrs 12.15 11.64 11.03 10.19 9.15

25. THANK YOU