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 6.7P
(a)
To determine
The maximum dry unit weight and the optimum moisture content.
(b)
To determine
The moist unit weight at the optimum moisture content.
(c)
To determine
The degree of saturation (S) at the optimum moisture content.
(d)
To determine
The relative compaction for the required field dry unit weight of
(e)
To determine
The range of compaction moisture contents in the field to achieve the relative compaction.
(f)
To determine
The relative density of compaction in the field.
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Students have asked these similar questions
1. A wet sand sample has a volume of 4.64 x 10⁻⁴ and weighs 8N. After oven drying, the weight reduces to 7.5N. Calculate the water content, void ratio and degree of saturation.(use Gs = 2.7)
2. A contractor has compacted the base course for a new road and found that the mean value of the test sample shows, w = 14.6%, Gs =2.81, and γ= 18.2 KN/m³. The specification require thate ≤0.8. has the contractor complied with the specifications?
3. The moist unit weight of soil is 16.5 KN/m³. Given that the w=15% and Gs = 2.70. Find:1) dry unit weight2) porosity3) degree of saturation
Given: Weight of wet sand sample (Ww) = 500 g
Weight of Dry sand sample (Wd) = 490 g
Moisture content of the given sand is:
5%
4%
2%
1%
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.
Chapter 6 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
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- A sample of sand above the water table was found to have a natural moisture content of 10% and a unit weight of 120 lb/ff3. Laboratory tests on a dried sample indicated values of void ratio as 0.45 and 0.90, for the densest and loosest states respectively. Compute the (a) degree of saturation, and (b) relative density. Use Gs=2.65.arrow_forwardA wet sand sample has a volume of 4.64 x 10-4 m3 and weighs 8 N. After oven-drying, the weight reduces to 7.5 N. Calculate the water content, void ratio, and degree of saturation.arrow_forwardPlease answer the following questions. In solving the problems, you should use stored values to get the exact values.arrow_forward
- Problem Set 2: 4. A sample of gray silty clay has a mass of 126 kg. Laboratory tests results give a moist density (p) of 2.05 g/cm³, a specific gravity of solids (G,) of 2.71, and a moisture content (w) of 15.7%. First determine all entries in the phase diagram. Then determine the void ratio (e), the porosity (n), the degree of saturation (S), the dry density (Pa), the dry unit weight (ya), and the moist unit weight (y). Draw the Phase diagram.arrow_forwardEstimate the value of coefficient of permeability for a uniform graded sand of size D₁0 = 0.15 mm obtained from sieve analysis. G = 2.67. 10arrow_forwardA. The maximum and minimum dry unit weights of a sand were determined in the laboratory to be 104 lb/ft and 93 lb/ft, respectively. What would be the relative compaction in the field if the relative density is 78%? Q1 B. Given Gs = 2.65, calculate the zero-air-void unit weight for a soil in lb/ft at W = 10%.arrow_forward
- A sample of sand has the following properties:Moist mass = 625.2 gDry mass = 589.9 gAbsorption = 1.6, Determine (a) total moisture content and (b) free moisture content.arrow_forwardAn undisturbed sample of medium sand weighs 484.68g. The cylindrical core sample is 6 cm in diameter and 10.61 cm high. The sample is oven-dried for 24hrs at 110°C to remove water content. At the end of drying, the sample weighs 447.32 g. Determine the bulk density, void ratio, water content and saturation percentage of the sample (Take Psand = 2.65 g/cm³)arrow_forwardA sample of uniform sand has a porosity of 43%.From the lab test, the value of the void ratio in theloosest condition is 0.85 and a void ratio of 0.35 inthe densest condition. If the water content is 12%and Gs = 2.7. Determine the following:a) Density indexb) Degree of saturationc) Determine the moist unit weightarrow_forward
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