Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Question
Chapter 6, Problem 6.14P
(a)
To determine
Find the dry unit weight in the field.
(b)
To determine
Find the relative density of compaction.
(c)
To determine
Find the moist unit weight.
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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 relative compaction of a sand in the field is 92%. The maximum and minimum dry unit weights of the sand are 16.2kn/m^3 and 14.6Kn/m^3, respectively. For the field condition, determine
a. Dry unit weight
b. Relative density of compaction
c. Moist unit weight at a moisture content of 12%
The maximum and minimum dry unit weights of a sand were determined in the laboratory to be 16.9 kN/m³ and
14.2 kN/m³, respectively. If the field relative density is 82%?
Determine
The degree of compaction in the field.
Field dry unit weight.
Field bulk unit weight if the field moisture content is 15%.
Chapter 6 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- A 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_forwardA 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_forwardA loose compacted sand fill is 1.81 m in depth and has a relative density of 41%. Laboratory tests indicated that the sand's minimum and maximum void ratios are 0.47 and 0.91 respectively. The specific gravity of the solids of the sand is 2.65. Find; (a) Dry unit weight of the sand. (b) Void ratio of the sand having a relative density of 40%. (c) If the sand is compacted to a relative density of 75% what is the decrease in the thickness of the 1.8m fill?arrow_forward
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