Ppt consolidation 3
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This document summarizes a study on the size effect in consolidation behavior. It includes outlines of topics like consolidation, consolidation tests performed including liquid limit, plastic limit and hydrometer analysis. It then details the procedures and results of consolidation and oedometer tests conducted on soil samples including measurements taken over time under different loads. The document provides information on consolidation definitions, tests, apparatus used and experimental results.
Ppt consolidation 3
- 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.
- 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
- 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
- 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
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