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 3, Problem 3.2CTP
(a)
To determine
Calculate the dry unit weight of the fill before and after compaction.
(b)
To determine
Calculate the final height of the fill after compaction.
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Problem 7:
A 3-m high sandy fill material was placed loosely at a relative density of 55%. Laboratory studies indicated that
the maximum and minimum void ratios of the fill material are 0.94 and 0.66, respectively. Construction
specifications required that the fill be compacted to a relative density of 85%. If Gs= 2.65, determine:
Dry unit weight of the fill before and after compaction
Final height of the fill after compaction
A loose compacted sand fill is 1.80 m in depth and has a relative density of 40%. Laboratory tests indicated that the sand's minimum and maximum void ratios are 0.46 and 0.90 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?
d) A sample of silty clay has a mass of 126 g. Laboratory tests results give a bulk density (p»)
of 2.05 g/em', a specific gravity of solids (G.) of 2.71, and a moisture content (w) of 15.7%.
Determine all the phase distributions and use the values to calculate the following:
i) void ratio (e),
ii) porosity (n),
ii) degree of saturation (S),
iv) dry density (pa),
v) dry unit weight (ya), and
vi) bulk unit weight (yhwlk)
Chapter 3 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
Ch. 3 - Prob. 3.1PCh. 3 - Prob. 3.2PCh. 3 - Prob. 3.3PCh. 3 - Prob. 3.4PCh. 3 - Prob. 3.5PCh. 3 - Prob. 3.6PCh. 3 - Prob. 3.7PCh. 3 - Prob. 3.8PCh. 3 - Prob. 3.9PCh. 3 - Prob. 3.10P
Ch. 3 - Prob. 3.11PCh. 3 - Prob. 3.12PCh. 3 - Prob. 3.13PCh. 3 - Prob. 3.14PCh. 3 - Prob. 3.15PCh. 3 - Prob. 3.16PCh. 3 - Prob. 3.17PCh. 3 - Prob. 3.18PCh. 3 - Prob. 3.19PCh. 3 - Prob. 3.20PCh. 3 - Prob. 3.21PCh. 3 - Prob. 3.22PCh. 3 - Prob. 3.23PCh. 3 - Prob. 3.24PCh. 3 - For a given sandy soil, emax = 0.75 and emin =...Ch. 3 - For a given sandy soil, the maximum and minimum...Ch. 3 - Prob. 3.27PCh. 3 - Prob. 3.28PCh. 3 - Prob. 3.29PCh. 3 - Prob. 3.1CTPCh. 3 - Prob. 3.2CTPCh. 3 - Prob. 3.3CTP
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- A loose uncompacted sand fill 5 ft in depth has a relative density of 40%. Laboratory tests indicated that the minimum and maximum void ratios of the sand are 0.46 and 0.90, respectively. The specific gravity 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%, what is the decrease in thickness of the 5-ft fill? Note: Weight of solids is constant before and after compactionarrow_forwardA sample of gray silty clay has a mass of 126 kg. Laboratory tests results give a moist density(ρ) of 2.05 g/cm3, a specific gravity of solids (Gs) of 2.67, and a moisture content (w) of 14.7%.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 (ρd), the dry unit weight (γd), and the moistunit weight (γ).arrow_forwardProblem 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_forward
- I need the answer as soon as possiblearrow_forwardCan I get a step by step for this question? A loose, uncompacted sand fill 6-ft in depth has a relative density of 40%. Laboratory tests indicated that the maximum and minimum void of the ratios of the fill material are 0.9 and 0.46, respectively. The specific gravity of solids of the soil is 2.65. If the final height of the fill after compaction is 5.4 ft, the relative density of the compacted fill is most nearly?arrow_forward1. A sample of saturated clay was placed in a container and weighed. The weight was 6 N. The clay withcontainer was oven dried for 24 hours at 105C and weighed again as 5N. if the weight of the containeris 1 N, and specific gravity of soil solids is 2.70, determine the a) water content b) void ratio c) bulk unitweight d) dry unit weight, e) saturated unit weight f) submerged unit weight. This is the question of Soil Mechanics.arrow_forward
- sample of gray silty clay has a mass of 126 kg. Laboratory tests results give a moist density (ρ) of 2.05 g/cm3, a specific gravity of solids (Gs) of 2.71, and 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 (ρd), the dry unit weight (Ƴd), and the moist unit weight (Ƴ)arrow_forwardAn undisturbed sample of fine sand is tested in the laboratory and found to have a dry mass of 4.63 kg, a total volume of 0.00198 m³ and a specific gravity of 2.70. Other laboratory tests are performed to determine the maximum and minimum density of the sand. At the maximum density, it is determined that the void ratio is 0.35 at the minimum density, the void ratio is 0.95. A. Compute the void ratio of the sand. B. Compute the relative density of the undisturbed sample. C. Compute the dry density in Mg/m³.arrow_forwardHelparrow_forward
- An undisturbed sample of fine sand is tested in the laboratory and found to have a dry mass of 3.23 kg, a total volume of 0.00187 m3and a specific gravity of 2.65. Other laboratory tests are performed to determine the maximum and minimum density for the sand. At the maximum density, it is determined that the void ratio is 0.38; at the minimum density, the void ratio is 0.85. Determine the relative density of the undisturbed sample.arrow_forward.arrow_forward6 Problem: The max. dry unit weight determined in the laboratory for a quart sand is 102 lb/ft3. In the field, the relative compaction is 90%. Specific gravity of sand is 2.70. a) Determine the void ratio at the max. dry unit weight condition. Determine the void ratio of the sand in b) the field condition.arrow_forward
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