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.
I keep seeing answers with 0.5m or 500mm instead of 500m as depth. The question specifically says 500m as the depth and it compressed 45mm when compacted.
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 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. I keep seeing answers with 0.5m or 500mm instead of 500m as depth. Im just confused
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_forward1. 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_forwardA clay layer of thickness 10 cm and initial void ratio 0.5 undergoes settlement so that the final void ratio is 0.2. The settlement of the layer in cm is:arrow_forward
- A 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_forwardThe 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.1.65arrow_forwardA stratified soil sample has the following profile characteristics: LAYER 1: The upper later is a 4-m thick sand layer with void ration = 0.61 and specific gravity of solids = 2.65. LAYER 2: The lower layer is a 5-m thick clay layer with void ration = 0.48 and specific gravity of solids = 2.67. If the ground water table is situated at the interface between the sand and clay layers, evaluate the effective stress (in kPa) at the bottom of the sand layer, and the effective stress at the bottom of the clay layer.arrow_forward
- 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.arrow_forward3. A layered soil is shown with the corresponding values K1, K2, and K3. a. Compute the equivalent horizontal coefficient of permeability b. Compute the equivalent vertical coefficient of permeability c. Compute the ratio of the equivalent horizontal coefficient of permeability to the equivalent vertical coefficient of permeability T H1= 3 m K1 =2 x 10 cm/s H2= 4 m K1 =3.2 x 10?cm/s H= 12 m H3= 5 m K1 =4.1 x 10 cm/sarrow_forward3. A sand has a natural water content of 5% and bulk unit weight of 18.0 kN/m3. The void ratios corresponding to the densest and loosest state of this soil are 0.51 and 0.87. Find the relative density and degree of saturation.arrow_forward
- 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 in situ void ratio. a.0.51 b.0.42 c.0.65 d.0.85arrow_forwardA saturated soil specimen has w = 36% and ᵞd = 85.43 lb/ft3. Determine: Void ratioarrow_forwardThe representative liquid limit and plastic limit values of a saturated consolidate clay deposit are 60% and 30%, respectively. The saturated unit weight of the soil is 19 kN/m³. The water table is at 8m below ground level. At a depth of 10m from the ground surface, what is the undrained shear strength of the soil.arrow_forward
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