MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, SI Edition, 9th Edition, [Instant Access], 1 term (6 months)
9th Edition
ISBN: 9781305971226
Author: Braja M. Das; Khaled Sobhan
Publisher: Cengage Learning US
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Chapter 3, Problem 3.28P
To determine
Calculate the relative density of the compacted sub-base.
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Q.7
The density of a fully started specimen of
clay having a water content of 40% is 1.85
gm/cc. On even drying, the density drop
of 1.74 gm/cc. The shrinkage limit of the
specimen will be (= 1.0 am / cc)
In a highway project, the granular
sub-base layer is compacted to a
moist unit weight of 122 Ib/cu.ft. at a
moisture content of 16%. What is the
relative density of the compacted
sub-base? Given emax = 0.85, emin =
0.42, and G, = 2.68.
%3D
Saturated clay has a volume of 18.9 cm^3 and a mass of 30.2 gm. On oven drying the mass reduces to 18 gm. The volume of dry specimen as determined by displacement of mercury is 9.9 cm^3. Determine the 1. shrinkage limit 2. specific gravity 3. shrinkage ratio
Chapter 3 Solutions
MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, SI Edition, 9th Edition, [Instant Access], 1 term (6 months)
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 clay layer of 25 ft thick is overlain with 50 ft thick of sand (Gs = 2.71). The water table is 20 ft below the ground surface. The saturated unit weight of the clay is 141 pcf. The sand below the water table has a unit weight of 128 pcf. The sand above the water table has an average moisture content of 20%. After drying, the sand was found to have a dry unit weight of 92 pcf. Determine the effective stress of the compressible layer.arrow_forwardA saturated sample of inorganic clay has a volume of 21.4 cm3 and weighs 36.7 g. After drying, the volume is 13.7 cm3. The weight of dry soil is 23.2 g. Determine the following: (a) Water content, (b) specific gravity, (c) void ratio, (d) saturated unit weight, (e) dry unit weight, (f) shrinkage limit.arrow_forward3.) A SAMPLE OF SAND HAS A RELATIVE DENSITY OF 40% N/A SOLID SPECIFIC GRAVITY OF 2.65 THE MINIMUM VOID RATIO 1 0.45 AND THE MAX VOID RATIO K 0.97. 9) DETERMINE THE VOID RATIO OF THE SAND AT RELATIVE DENSITY OF 40% b.) DENSITY OF SAND IN SATURATED CONDITION IN PCF C) IF THE SAND IS COMPACTED TO A RELATIVE DENSITY OF 65%, WHAT WILL BE THE DECREASE IN THICKNESS OF A 4FT, THICK LAYER IN FEETarrow_forward
- Problem 3 Saturated clay has a volume of 18.9 cm^3 and a mass of 30.2 gm. On oven drying the mass reduces to 18 gm. The volume of dry specimen as determined by displacement of mercury is 9.9 cm^3. Determine the 1. shrinkage limit 2. specific gravity3. shrinkage ratioarrow_forwardA shrinkage limit test for a saturated specimen had the initial volume Vi = 21.35 cm3 and initial weight Wi = 37 gf ( = 37 × 0.00981 = 0.363 N). After drying, it became Vf = 14.3 cm3 and Wf = 26 gf (= 26 × 0.00981 = 0.255 N). Compute the shrinkage limit (SL) of this soil.arrow_forwardA saturated clay has a natural moisture content of 43%. Taking Gs = 2.70, calculate the void ratio, porosity and wet density.arrow_forward
- A clay layer 25 feet thick is overlain with 50 feet thick of sand with specific gravity of 2.71. The water table is 20 feet below the sand surface. The saturated unit weight of clay is 141.0 pcf. The sand below the water table has a unit weight of 128.0 pcf. The sand above the water table has an average moisture content of 20.0%. After drying the sand was. found to have a dry unit of 92.0 pcf. Determine the effective stress at the mid-height of Lhe clay layer.arrow_forwardIf a clay sample has a void ratio of 0.50 in dry state and specific gravity of solids 2.70, then the shrinkage limit will bearrow_forwardA certain saturated sand (S = 100%) has a moisture content of 25.1% and a specific gravity of solids of 2.68. It also has a maximum void ratio of 0.84 and a minimum void ratio of 0.33. Calculate its relative density and classify its consistencyarrow_forward
- A certain saturated sand (S = 100,) has a moisture content of 25.1 percent and a specificgravity of solids of 2.68. It also has a maximum index void ratio of 0.84 and a minimum indexvoid ratio of 0.33. Compute its relative density and classify its consistency.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_forwardIn a highway project, the granular sub-base layer is compacted to a moist unitweight of 19.16 kN/m3 at a moisture content of 16%. What is the relative density of the compacted sub-base? Given: emax = 0.85, emin = 0.42, and Gs = 2.68. To improve the bearing capacity of the same sub-base,the field engineers decided to increase the relative density to 85% by additional compaction. What would be the final dry unit weight of the compacted sub-base?arrow_forward
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