Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 5, Problem 5.8P
To determine
Find the cubic meters of soil are needed from the excavation site to produce
Find the number of 1,789 kN truck loads is needed to transport the excavated soil.
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The in situ moisture content of a soil is 18% and the moist unit weight is 16.5 kN/m3.The specific gravity of soil solids is 2.75. This soil is to be excavated and transported toa construction site for use in a compacted fill. If the specifications call for the soil tobe compacted to a minimum dry unit weight of 16.27 kN/m3 at the same moisturecontent of 18%, how many cubic meters of soil from the excavation site are needed toproduce 7651 m3 of compacted fill? How many 178 kN truckloads are needed totransport the excavated soil
In its natural state the soil in a borrow pit, the total (moist) unit weight is 120 lb/ft³,
and the water (moisture) content is 20 %. The result of the Modified compaction
test of the soil of the borrow pit is given in the figure below. The soil from the
borrow pit will be used to construct a compacted fill. The construction of the fill
requires 10,000 ft³ of compacted soil. The specifications required that the
compaction of the fill be performed at the optimum moisture content to obtain the
maximum dry unit weight for fill. How much (volume in ft³) must be excavated
from the borrow pit?
Dry unit weight (lb/ft³)
107
106
105
104
103
102
8
12
w (%)
16
20
24
An earth dam needs to be compacted to reach 1.84 g/cm' at 15% water content. The field unit weight before compaction of the earth dam soil is 1.77 g/cm', the moisture content is 8% and specific gravity is 2.7. What is the amount of soil required to construct one cubic meter of the earth dam after compaction?
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Fundamentals of Geotechnical Engineering (MindTap Course List)
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- The laboratory compaction test of a certain type of soil gives a max dry density of 1.486 gm/cu.cm with an optimum water content of 12.5%. The ff are the results of a field density test using sand code equipment: Volume of soil excavated from the hole= 0.001337 cu.m. Weight of wet soil from the hole- 2220 grams Weight of soil after oven drying= 1890 grams a. Determine the field unit weight of the soil in gm/cu.cm. b. Find the water content of soil. c. What is the relative compaction?arrow_forwarda) What are the typical permeability values for clay and sand, respectively? Discuss how the pore pressure in these soils would respond to loading, make use of schematic drawings when needed. b) A sample of silty clay is compacted into a mould 150 mm in diameter and 120 mm high. The mass of soil is 3.527 kg which reduces to 2.594 kg after drying in an oven. Calculate the bulk unit weight of the soil sample. Assuming the specific gravity of the soil grains, Gs = 2.72, calculate the degree of saturation and voids ratio of the soll. c) A site investigation is carried out in Northampton Square for a proposed five storey building. The ground is found to comprise 2 m of coarse gravel overlying London Clay. The gravel has a Gs = 2.65 and a specific volume of 1.573. The clay has a bulk unit weight = 17.9 kN/m³ and a coefficient of earth pressure, Ko= 1.1. The water table is at a depth of 2 m below the ground surface (i.e. level with the top of the London Clay strata). Calculate the vertical…arrow_forwardPROBLEM 3: A saturated, remolded clay soil has a water content of 32 percent, a liquid limit water content of 35 percent, a plastic limit water content of 20 percent, and an amount of clay sizes (finer than 0.002 mm) of 17 percent. What is the liquidity index of this soil? a. 0.6 C. 0.25 b. 0.8 d. 0.96arrow_forward
- The following are given for a natural soil deposit: Moist unit weight, y = 17.8 kN/m° Moisture content, w = 16 % G, = 2.7 This soil is to be excavated and transported to a construction site for use in a compacted fill. If the specification calls for the soil to be compacted at least to a dry unit weight of 18.4 kN/m° at the same moisture content of 16%, how many cubic meters of soil from the excavation site are needed to produce 21,000 m³ of compacted fill? (Enter your answer to three significant figures.) Total volume of soil to be excavated = m3arrow_forwardA soil sample is oven-dried from its liquid limit state to its dry state causing a volume change of 60% of the dry volume. Likewise, the same soil is oven-dried from its plastic limit state to its dry state causing a volume change of 20% of the dry volume. The liquid limit and plastic limit are 54% and 26%, respectively. Determine the specific gravity of soil solids, shrinkage limit and shrinkage ratio. 1. INPUT THE VALUE OF SPECIFIC GRAVITY OF SOIL SOLIDS IN 2 DECIMAL PLACES 2. INPUT THE VALUE OF SHRINKAGE LIMIT IN PERCENTAGE FORM AND IN 2 DECIMAL PLACES 3. INPUT THE VALUE OF SHRINKAGE RATIO IN 2 DECIMAL PLACES Answer with text and/or attachments:arrow_forwardThe Atterberg limits of a clay soil are: Liquid limit = 75%; Plastic limit = 45%; and Shrinkage limit = 25%. If a sample of this soil has a volume of 30 cm3 at the liquid limit and a volume 16.6 cm3 at the shrinkage limit. Determine the specific gravity of solids, shrinkage ratio, and the volumetric shrinkage.arrow_forward
- Sand at a borrow pit is determined to have an in-place dry unit weight of 115 pcf. Laboratory tests performed to determine the maximum and minimum unit weights give values of 122 pcf and 102 pcf, respectively. From these data, what is the relative density of the natural soil?arrow_forwarda) A saturated soil element has a specific gravity of 2.65 and water content of 10%. Determine the void ratio. b) The mass of a sample of moist soil is 240 grams. The sample is then dried in the oven and the mass reducesto 190 grams. Determine the water content of the soil as it was brought to the lab.arrow_forward1. The water content of a 100% saturated soil is 30% and the specific gravity of solids is 2.65. Determine the void ratio and unit weight (kN/m³) 2. A 0.08 m³ sample of soil weighs 1.4 kN. When it is dried out in an oven, it weighs 1.3 kN. The specific gravity of solids is found to be 2.70. Find the water content, void ratio, porosity, degree of saturation and the wet and dry unit weights. 3. A container with soil sample of completely saturated clay weighs 0.7 N. After drying, the weight becomes 0.62 N. The container weight is 0.35 N and the specific gravity of the soil is 2.70. Determine the void ratio, water content and porosity of the original sample. 4. A moist sand sample has a volume of 464 cm³ in natural state and a weight of 8.5 N. The dry weight is 7.4 N and the specific gravity is 2.68. Determine the void ratio, the porosity, the water content and the degree of saturation.arrow_forward
- The natural moistue content of an excavated soil is 32%. Its liquid limit is 60% and plastic limit is 27%. Determine the plasticity index of the soil and comment about the nature of the soil.arrow_forwardThe volume of the soil measured before drying is 120cc. The moist soil is 215g and dried weight is 162g. If the void ratio is 0.889, what is the approximate specific gravity of the soil? Choices: A. 2.28 B. 2.62 C. 2.55 D. 2.42arrow_forwardDuring a compaction test, a soil attains the maximum dry unit weight of 18.6 kN/m3 at a water content of 15 percent. The specific gravity of soil is 2.7. Determine the degree of saturation, air content at the maximum dry unit weight. What would be the maximum theoretical dry density corresponding to zero air voids at optimum water content?arrow_forward
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