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 3.12P
To determine
Find the new void ratio after compaction and the unit weight of the soil.
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The top 500m of a site consists of a clayey sand with a void ratio of 0.90 and a water content of 20.0%. The specific gravity of the soil grains is 2.68. When the ground is compacted at the same water content, there is 45mm reduction in the thickness of this layer. Determine the new void ratio and the unit weight of the soil.
The top 500 m of a site consists of a clayey sand with void ratio of 0.90 and water content of 20.0%. The specific gravity of the soil grains is 2.68.
When the ground is compacted at the same water content, there is 45 mm reduction in the thickness of this layer. Determine the new void ratio and the unit weight of the soil.
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A compressible 6 m thick clay layer has initial void ratio of 1.70. If final void ratio after
construction of building is expected to be 1.61, then what is the coefficient of volume
compressibility of soil layer? Assume that during settlement, 150 kN/m^2 increment in
stress is observed.
Chapter 3 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- For a normally consolidated soil, the following is given: Determine the following: a. The compression index, Cc. b. The void ratio corresponding to pressure of 200 kN/m2arrow_forwardThe dry density of a sand with a porosity of 0.387 is 1600 kg/ m3, determine the void ratio, specific gravity, and saturated unit weight of soil in KN/ m3.arrow_forwardFor a given sand, the maximum and minimum void ratios are 0.78 and 0.43 respectively. Given Gs=2.67, determine the dry unit weight of the soil when the relative density is 65%arrow_forward
- A horizontal stratified soil deposit consists of three layers each uniform in itself. The permeabilities of these layers are 8 × 10–4 cm/s, 52 × 10–4 cm/s, and 6 × 10–4 cm/s, and their thickness are 7, 3 and 10 m respectively. Find the effective average permeability of the deposit in the horizontal and vertical direction (mm/s).arrow_forwardThe maximum and minimum void ratio of a soil is 0.85 and 0.50 respectively. The soil of Gs=2.7 has a density of 18 kN/m3 at a water content of 8%. Determine the relative density of the soil and take density of water as 10 kN/m3.arrow_forwardThe moist unit weight of a soil is 19.2 kN/m3. Given that Gs = 2.69 and w = 9.8%, determine:a. Void ratiob. Dry unit weightc. Degree of saturationarrow_forward
- A 3 layer soil has the following properties from top to bottom. Obtain the equivalent vertical coefficienct of permeability, in cm/sec, round off to 7 decimal places, and obtain the equivalent horizontal coefficient of permeability, in cm/sec, round off to 5 decimal places.arrow_forwardA saturated soil specimen has w = 36% and ᵞd = 85.43 lb/ft3. Determine: Void ratioarrow_forwardA fine, dry sand with an in-place unit weight of 17. 28 KN/m^3 has a spocific gravity of solids of 2.62. The void ratio at its densest condition is 0.368 and the void ratio at the loosest condition is 0.938. Determine the relative density of the soil.arrow_forward
- A three-layer soil has the following properties: Layer 1: k = 2.77 x 10^-3 cm/s, H = 3.17 m. Layer 2: k = 1.6 x 10^-2 cm/s, H = 4.97 m. Layer 3: k = 3.06 x 10^-3 cm/s, H = 4.25 m. Determine the equivalent vertical coefficient of permeability of the soil arrangement. Layer 1 is on top of layer 2 while layer 2 is on top of layer 3. Round off to four decimal places.arrow_forwardPROBLEM 50: Compute the compression index of undisturbed clay having a plastic limit of 32% and a plasticity index of 8%arrow_forwardA normally consolidated clay layer is 18 m thick. Natural water content is 45 %, saturated unit weight is 18 kN/m3 , grain specific gravity is 2.7 and liquid limit is 63 %. The vertical stress increment at the center of clay layer due to foundation load is 9 kPa. Ground water table is at the surface. Determine the settlement.arrow_forward
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