Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 3, Problem 3.15P
To determine
Find the dry unit weight of the soil in
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The maximum and minimum void ratios for sand are 0.805 and 0.501 respectively. The field density test performed on the same soil has given the following results:ρ = 1.81 g/cm3, w= 12.7 %. Assume G= 2.67. Compute the dry density in Mg/m3.
a.1.606
b.1.85
c.1.512
d.1.65
PROBLEM No. 4
A sample of dry sand having a unit weight of 17.50 kN/m³ and a
specific gravity of 2.69 is placed in the rain. During the rain, the
volume of the sample remains constant but the degree of
saturation increases to 45%.
Determine the following:
The void ratio of the sample in percent.
b. The unit weight of the sample after being in the rain.
The water content of the sample after being in the rain.
a.
С.
A sand with Gs = 2.66 and a void ratio of 0.60 is completely dry. It the
becomes wetted by a rising groundwater table. Compute the unit weight in
KN/m3 under the following conditions;
a) When the sand is completely dry
b) When the sand is 40% saturated
c) When the sand is completely saturated
Chapter 3 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- The dry unit weight of a sand sample in the loosest state is 13.34 kN/m³ and in the densest state, it is 21.19 kN/m³. Its grain specific gravity is 2.70 and has a porosity of 33%. 23. Determine the void ratio of the sand at the given porosity. b. 0.6493 а. 0.4925 C. 0.4241 d. 0.5256 24. Determine the relative density. а. 0.670 b. 0.605 С. 0.655 d. 0.625 25. Find the relative compaction. a. 95.67% b. 93.52% C. 83.12% d. 83.75%arrow_forwardA 600 cm volume of moist sand weighs 1050 g Its dry weight is 930 g and specific gravity of solids, G is 2 67. Assuming density of water as 1 g/cm, the void ratio is Select one O a 0 50 Ob.0.64 OC.0.48 Od 0.72arrow_forwardThe porosity (n) of a mass of soil is 46.69 %. What is the void ratio, e, expressed as a percentage? Lütfen birini seçin: O a. 114% O b. 53.31% O c. 87.58% O d. 31.83%arrow_forward
- 1. The relative compaction of a clayey sand in the field is 90%. In the laboratory, the maximum dry unit weight is 115 ??/??3. If the soil layer before compaction had a void ratio of 0.97 and a thickness of 5.5 ft. What would be the final thickness after compaction? Assume ?? = 2.67. COMPLETE SOLUTION PLEASEarrow_forwardSolutions plsarrow_forwardProblem 1.9 The maximum and minimum void ratios for a sand are 0.805 and 0.501 respectively. The field density test performed on the same soil has given the following results: 3 p= 1.81 Mg/m², w = 12.7%. Assume G₁ = 2.65. Compute the density index.arrow_forward
- soil mechanicarrow_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_forwardThe water content and the total density in a partially saturated sand ( G= 2.64) layer are w=20% and p=1.8 g/cm3 , respectively. If the maximum and minimum values of the void ratio are 0.92 and 0.62, respectively determine the relative density Dr of the sand in this layer.arrow_forward
- Mcqarrow_forwardA sand with Gs= 2.66 and void ratio e=0.60 is completely dry. It been becomes wetted by a rising groundwater table. Compute the unit weight in KN/cu.m. under the following conditions:a) When the sand is completely dryb) When the sand is 40% saturatedc) When the sand is completely saturatedarrow_forwardThe void ratio of a soil is 1.2. Determine the bulk and effective unit weights at, first 75%, second 95%, and 100% saturation. What is the percentage error in the bulk unit weight if the soil is 95% saturated but assumed to be 100% saturated?arrow_forward
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