Principles of Foundation Engineering
9th Edition
ISBN: 9780357684832
Author: Das
Publisher: Cengage Learning US
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Chapter 2, Problem 2.4P
To determine
Find the volume of soil removed and amount of water added to the soil from the borrow pit.
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The soil at a borrow area is at moisture content of 8.5%and unit weight of 17.5 kN/m3. This soil is used in the construction of a compacted road base where the dry unitweight is 19.5 kN/m3 and the moisture content is 14.0%. Ifthe finished volume of the road base is 120,000 m3, whatwould be the volume of the soil removed from the borrowpit? How much water would be added to the soil from theborrow pit?
a)
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…
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
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Principles of Foundation Engineering
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- 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?arrow_forwardIn a fill section of a construction site, 1600 m³ of moist compacted soils are required. The design water content of the fill is 14.5%, and the design unit weight of the compacted soil is 17.8 kN/m³. Necessary soil is brought from a borrow site, with the soil having 11.5% natural water content, 17.2 kN/m³ wet unit weight, and G, = 2.64. How much (in cubic meters) of the borrow material is required to fill the construction fill section? And how heavy is it?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
- Is it possible for a soil to have a liquid limit and a plasticity index(PI) both equal to 30%?Why?arrow_forwardThe 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 to a construction site for use in a compacted fill. If the specifications call for the soil to be compacted to a minimum dry unit weight of 16.27 kN/m3 at the same moisture content of 18%, how many cubic meters of soil from the excavation site are needed to produce 7,651 m3 of compacted fill? How many 178 kN truckloads are needed to transport the excavated soil?arrow_forwardA saturated cohesive soil has the following characteristics: Initial Volume = 33.5 cm3 Final Volume = 21.6 cm3 Mass of Wet Soil = 60.0 g Mass of Dry Soil = 41.2 g a) Determine the shrinkage limit for this soil. b) Determine the shrinkage ratio for this soil. c) Determine the specific gravity for this soil. Does this number make sense?arrow_forward
- In its natural state, a moist soil has a volume of 0.33 ft3 and weighs 39.93 lb. The oven-dried weight of the soil is 34.54 lb. If Gs=2.67, calculate total volume void in ft3 a) 0.2157 b) 0.2043 c) 0.684 d) 0.381arrow_forwardQUESTION 1: PHASE RELATIONS a. The bulk unit weight and water content of a soil at a borrow pit are 17.2 kN/ml and 8.2% respectively. A highway fill is being constructed using the soil from this borrow at a dry unit weight of 18.05 kN/m³. Find the volume of the borrow pit that would make one cubic meter of the finished highway fill. b. A soil to be used in the construction of an embankment is obtained by hydraulic dredging of a nearby canal. The embankment is to be: placed at a dry density of 1.72 t/m³ and will have a finished volume of 20,000 m³. The in situ saturated density of the soil at the bottom of the canal is 1.64 t/m³. The effluent from the dredging operation, having a density of 1.43 t/m³, is pumped to the embankment site at the rate of 600 L per minute. The specific gravity of the soil grains is 2.70. i. ii. How many operational hours would be required to dredge sufficient soil for the embankment? what would be the volume of the excavation at the bottom of the canal? c. A…arrow_forwardThe moist mass of 0.1 ft3 of soil is 12.5 lb. if the moisture content is 14% and the specific gravity of soil solids 2.71; a) What is the value of moist unit weight? b) What is the value of dry unit weight? c) What is the value of void ratio?arrow_forward
- A sample of soft saturated clay has a volume of 100 cu.m. and weighs 175 grams. After oven-drying, it has a mass of 120 grams. What is the volume of voids in m3? b. What is the volume of water in m3? c. What is the void ratio of the sample? a. What is the specific gravity of the soil?arrow_forwardA stratified soil has the following properties: h1 = 1.75m h2 = 2.5m h3 = 4.35m k1 = 2.25E-03 cm/sec k2 = 3.15E-04 cm/sec k3 = 4.75E-05 cm/sec What is the equivalent coefficient of permeability if the water flows parallel to the layer of soil (KeqH) in cm/sec?arrow_forwardEarth is required to be excavated from a borrow pit for building an embankment. The wet unit weight of undisturbed soil is 18kN/m3 and its water content is 8%. The dry unit weight required in the compacted embankment is 15kN/m3 with a moisture content of 10%. Assuming the specific gravity of solids as 2.67, determine the void ratios and the degree of saturation of the soil in both the undisturbed and compacted states. Hint: Apply the basic principles of Phase Relationships in Soil Mechanicsarrow_forward
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