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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- 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
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