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Lab Manuals for Geotechnical Engineering- 1 - GTE-1 By Bindusara TS

  • Geotechnical Engineering- 1 - GTE-1
  • Practical
  • SREENIDHI INSTITUTE OF SCIENCE AND TECHNOLOGY - SNIST
  • Civil Engineering
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Bindusara TS, Assistant Professor, SNIST, Hyderabad LABORATORY MANUAL FOR GEOTECHNICAL ENGINEERING Bindusara TS Assistant Professor Civil Engineering Department Sreenidhi Institute of Science and Technology, Hyderabad Mob: 9035946482 Email: Bindusara.civil@gmail.com

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Geotechnical Engineering Laboratory CONTENTS SL. NO 1 Bindusara TS, Assistant Professor, SNIST, Hyderabad 2 3 EXPERIMENT PAGE NO a) Determination of specific gravity of soil sample by pycnometer method 3 b) Determination of moisture content of soil sample by oven dry method 6 Grain size analysis of soil sample by sieve analysis 9 a) Determination of in situ density by core cutter method 12 b) Determination of in situ density by sand replacement method 16 Determination of liquid limit of soil samples by Casagrande methods 21 a) Determination of plastic limit of soil samples 24 b) Determination of shrinkage limit of soil samples 27 6 Determination of compaction characteristics of soil by standard proctor compaction test 31 7 Determination of compaction characteristics of soil by modified proctor compaction test 35 8 Determination of coefficient of permeability of soil sample by constant and variable head method 39 9 Determination of shear strength parameters of soil by direct shear test. 44 10 Determination of shear strength parameters of soil sample by Triaxial shear test Determination of shear strength parameters of soil sample by unconfined compression test. 50 Determination of compression index and coefficient of consolidation by consolidation test 62 4 5 11 12 58 Page 2

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Geotechnical Engineering Laboratory EXPERIMENT – 1 (A) DETERMINATION OF SPECIFIC GRAVITY OF SOIL SAMPLE BY PYCNOMETER METHOD AIM: To determine the specific gravity and moisture content of soil sample by pycnometer method. Bindusara TS, Assistant Professor, SNIST, Hyderabad THEORY: Specific gravity is defined as the ratio of weight of a given volume of dry soil solids to weight of an equal volume of distilled at 4 degree °C APPARATUS REQUIRED:         Pycnometer Bottle of 500 to 1000 cm3 IS sieve 4.75mm Balance 0.1g accuracy Thermometer Moisture tin Glass rod Pan Electric oven PROCEDURE: 1. Take the weight of cleaned and dried pycnometer with its cap and washer. Let it be W 1. 2. Put about 200 to 400 g of soil in the pycnometer and then weigh the soil with pycnometer with its cap and washer. Let it be W2. The soil should be obtained after sieving it through 4.75mm IS Sieve. 3. Put distilled water in the pycnometer such that the soil water mixture becomes equal to half the weight of pycnometer. 4. Stir the soil water mixture in the pycnometer by a glass rod to remove the entrapped the air. 5. Add water in the pycnometer such that the pycnometer is completely filled. Find the weight of pycnometer with soil, water, cap and washer. Let it be W3. 6. Empty the pycnometer and clean it. Add distilled water in the pycnometer such that it is completely filled. Find the weight of pycnometer filled with water along with cap and washer. Let it be W4. Page 3

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Geotechnical Engineering Laboratory PRECAUTIONS: 1. 2. 3. 4. The soil grain should be completely dry. The cap should be properly screwed with washer so that there is no leakage. There should be no error while weighing the soil. The entrapped air should be completely eliminated. OBSERVATION AND CALCULATIONS: Bindusara TS, Assistant Professor, SNIST, Hyderabad Weight of dry soil = W2 –W1 Weight of equal volume of water = (W2 –W1) - (W3-W4) Hence, Specific gravity at T °C GT = W2−W1 (W2 –W1) − (W3−W4) Hence, Specific gravity at T °C GT = 𝐺 𝑇 w = [[ Specific gravity of water at T °C Specific gravity of water at 27 °C W2−W1 W3−W4 ]X[ 𝐺−1 𝐺 ] − 1] X 100 TABULAR COLUMN: Sl. no Observation No 1 Weight of Pycnometer bottle, W1 (g) 2 Weight of Pycnometer bottle with dry soil , W2 (g) 3 Weight of Pycnometer bottle with dry soil , and water filled up to the top, W3 (g) 4 Weight of Pycnometer bottle with full of water , W4 (g) 1 2 3 RESULTS: 1. The specific Gravity of soil at T °C, GT = 2. The specific Gravity of soil at 27 °C, G27 = 3. The Average moisture content of soil sample w = …………………………... ……………………………. ……………………………. Page 4

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