Principles of Foundation Engineering, SI Edition
9th Edition
ISBN: 9781337672085
Author: Das, Braja M., SIVAKUGAN, Nagaratnam
Publisher: Cengage Learning
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Chapter 2, Problem 2.5P
To determine
Determine the relative density of the compacted sand.
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The relative compaction of a 4-m thick sand in the field is 79.34% and moisture content of 10.44%. The maximum and minimum dry unit weights of the sand are 108.66 lb/ft3 and 63.41 lb/ft3, respectively. If the specific gravity of the sand in the field is 2.644, determine the following:
a. Bulk unit weight of the soil in the field, in lb/ft3.
b. Relative density in the field, in %.
c. Thickness of sand to satisfy a compaction requirement in the site to about 95%.
The maximum and minimum unit weights of a granular soil are 117.1 lb/ft3 and 91.0 lb/ft3, respectively. Gs 5 2.65. What would be the relative density of the same sand compacted to a void ratio of 0.625?
A certain saturated sand (S = 100,) has a moisture content of 25.1 percent and a specificgravity of solids of 2.68. It also has a maximum index void ratio of 0.84 and a minimum indexvoid ratio of 0.33. Compute its relative density and classify its consistency.
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Principles of Foundation Engineering, SI Edition
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- 2.5 A granular soil with G, = 2.65, emax = 0.870, and emin 0.515 is compacted to a moist unit weight of 17.36 kN/m³ at moisture content of 10.5%. What is the relative density of this compacted sand?arrow_forwardA granular soil with a Gs = 2.70, e 0.520 is compacted to a moist unit weight of 112.2 psf at a moisture content of 11%. What is the relative density of the compacted sand? 0.880 and e max minarrow_forwardA loose, uncompacted sand fill 1.8m in depth has a relative densityof 40%. Laboratory tests indicated that the minimum and maximum voidratios of the sand are 0.46 and 0.90, respectively. The specificgravity of solids of the sand is 2.65.a. What is the dry unit weight of the sand?b. If the sand is compacted to a relative density of 75%, whatis the decrease in thickness of the 1.8m fill?arrow_forward
- A certain saturated sand (S = 100%) has a moisture content of 27.9% and a specific gravity of solids of 2.61. It also has a maximum index void ratio of 0.90 and a minimum index void ratio of 0.33. Compute its relative density and classify its consistency. (Table on the right) Solution: Given the values of mmoisture content, specific gravity and degree of saturation, the void ratio can be estiamted as: e = Thus the relative density is found to be Dr = • According to the table, the soil is classified as %; soil. TABLE 3.3 CONSISTENCY OF COARSE-GRAINED SOILS AT VARIOUS RELATIVE DENSITIES (data from Lambe and Whitman, 1969) Relative Density, D,(%) 0-15 15-35 35-65 65-85 85-100 Classification Very loose Loose Medium denseª Dense Very dense "Lambe and Whitman used the term "medium," but "medium dense" is better because "medium" usually refers to the particle size distribution.arrow_forwardThe total unit weight, relative density, water content, and specific gravity of solids of a given sand are 17.98 KN/m^3, 62%, 7.6% and 2.65, respectively. a. If the minimum void ratio for this soil is 0.35, what would be its maximum void ratio? b. What is its unit weight in the loosest condition?arrow_forwardThe dry unit of a sand with a porosity of 0.387 is 1600kg/cu.m. Determine the following:a) Void ratiob) Sp.gr. of soilc) Saturated unit weight of soil in KN/cu.m.arrow_forward
- 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…arrow_forwardAdry sand is known to have an angle of internal friction equal to 35°. What is the maximum major principal stress that the soil can withstand when the minor principal stress is 20 psf?arrow_forwardQuestion A 588 cm³ volume of moist sand weighs 1010 gm. Its dry weight is 918 gm and specific gravity of solids, G is 2.67. Assuming density of water as 1 gm/cm³, the void ratio isarrow_forward
- A saturated clay 120cu.cm clay sample has a natural water content of 35%. The shrinkage limit was determined when the water content reaches 20%. Given the specific gravity of soil is 2.6. Calculate the shrinkage ratio.arrow_forwardGiven Well graded sand Specific gravity of soil = 2.65 Void ratio = 0.57 Porosity = 36.5% Find the degree of saturation O 0.99 3.55 O 16.51 O 20.06arrow_forwardThe dry density of a sand with porosity of 0.387 is 1600 kg/m³. a. Calculate the void ratio of the soil b. Calculate the specific gravity c. Calculate the effective density of the soil in kg/m3arrow_forward
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