Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 5, Problem 5.10P
To determine
Classify the soil according to the Unified soil classification system and provide group symbol and group name.
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Answer the following:
a) What is the difference between the U-line and the A-line on a plasticity chart?
b) What is the dividing point between silts and clays on a plasticity chart?
c) What is the dividing point between low, medium, and high plasticity on a plasticity chart?
d) An inorganic soil has a Liquid Limit of 55 and a Plastic Limit of 30. Using the plasticity chart determine the relative classification for this soil.
A clay soil is found to have a liquid limit of 75 percent, a plastic limit of 45 percent, and a shrinkage limit of 25 percent. If a sample of this soil has a total volume of 30 cm3 at the liquid limit and a volume of 16.7 cm3 at the shrinkage limit, what is the specific gravity of the soil solids?
In an experiment, a soil is dug out from the ground, weighed, then oven dried, and then saturated with water. The weight of soil taken from the test hole is 1539 grams. The oven dried weight was 1163 grams. After saturating, it weighed 1632 grams. The volume of the test hole is found to be 1042cc. Determine the following:
a. Void ratio.
b. Specific gravity of the soil solids.
c. Degree of saturation, %.
Chapter 5 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- A sample of soil in natural state having volume of 0.00934 cu.m weighs 18.11kg. The sample is allowed to dry in an oven and weight was reduced to 15.67 kg. The specific gravity of solid was found to be 2.67. Determine the following: (a.) Moist unit weight of soil and dry unit weight of soil (b.) Void ratio and porosity (c.) Moisture content and Degree of saturation Show your solutionsarrow_forwardThe volume and weight of a partially saturated clay sample are 185 cm3 and 362 g respectively. After drying in an oven its weight reduced to 326 g. If the natural void ratio of the soil was 0.54, determine the moisture content in percent. O a. 8 O b. 10 Oc. 9 O d. 11arrow_forwardThe field weight of soil sample is 1900 kg/cu.m. andthe unit weight of the soil particle is 2600 kg/cu.m.a) Compute the dry unit weight if the moisturecontent is 11.5%b) Compute the void ratioc) Compute the degree of saturationarrow_forward
- The porosity of a silty sand soil sample is found to be 0.309. Its initial weight is 274.471 grams, and after oven drying for 24 hours, it reduces to 244.321 grams. If the density of the soil solids is 2581 kg/m3, determine the following:Bulk unit weight, Volume of voids, Volume of water to be added/evaporated per cubic meter of soil to attain 50% degree of saturationarrow_forwardA cylindrical soil sample prepared for laboratory testing has a diameter of 71 mm, a height of 142 mm, and weighs 10.675 x 10-3 kN. If the degree of saturation is 93% and the specific gravity of soil solids is 2.71, determine: void ratio water content water content under fully saturated conditionarrow_forwardA falling head permeability test is conducted on silty soil. The sample diameter is 10.0 cm and its length or thickness is 6 cm. The diameter of the standpipe is 6.0 mm. The head at the start of the test is 58 cm. The test lasts 9 min and the head falls to 38 cm. Find the coefficient of permeability of this soil. The answer must be in 6 decimal places. Use units cm/sec.arrow_forward
- The volume and weight of a partially saturated clay sample are 185 cm3 and 362 g respectively. After drying in an oven its weight reduced to 326 g. If the natural void ratio of the soil was 0.54, determine the moisture content in percent. a.9 b.11 c.8 d.10arrow_forwardA soil sample has a field unit weight of 1800kg/m³ and the unit weight of soil particle is 2000kg/m³. If the moisture content is 12%, Which of the following most nearly gives the void ratio of the soil sample? Which of the following most nearly gives the dry unit weight of the soil sample? Which of the following most nearly gives the degree of saturation in percent? A soil sample has 40% porosity. Find its void ratio.arrow_forwardA sample of soil was taken from below the groundwater table. The moisture content was determined to be 52% and the specific gravity of solids (Gs) was found to be 2.69. Determine: (a) the moist unit weight, (b) the dry unit weight, (c) the buoyant (submerged) unit weight, (d) the void ratio, and (e) the porosity.arrow_forward
- A soil sample has a volume of 29cm^3 and a mass of 45.5 g in its natural state in the field. After drying the mass of the sample reduced to 32g. if specific gravity of solids is 2.66. find a) water content b)Vs, Va, Vw c)void ratio d) Vw in 1m3 if the soil was fully saturatedarrow_forwardA falling head permeability test is conducted on silty soil. The sample diameter is 10.0 cm and its length or thickness is 6 cm. The diameter of the standpipe is 6.0 mm. The head at the start of the test is 58 cm. The test lasts 9 min and the head falls to 38 cm. Find the coefficient of permeability of this soil. The answer must be in 6 decimal places. Use units cm/sec. Provide step by step solution.arrow_forwardA soil sample has a unit weight of 1.9 g/cc and w=12%. If Gs of solids is 2.65, determine the porosity in percent.arrow_forward
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