Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 3, Problem 3.28P
To determine
Calculate the relative density of the compacted sub-base.
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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
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)
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.
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- 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 ratioarrow_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_forwardProblem 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_forward
- A 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_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_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_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_forwardA 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_forward
- In 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_forwardDetailed solution please A clay has the following Atterberg limits: liquid limit = 60%, plastic limit = 40%, shrinkage limit = 25%. The clay shrinks from 15 cubic centimeters to 9.57 cubic centimeters when the moisture content is decreased from the liquid limit to the shrinkage limit. a. What is the specific gravity? b. What is the plasticity index? c. What is the liquidity index if the water content is 52%? d. From a hydrometer analysis to determine particle sizes, it is found that 45 percent of the sample consists of particles smaller that 0.002 mm. From this information indicate the activity classification of the clay.arrow_forwardA structure is built on a normally consolidated clay of thickness of H(m), where H is the last digit of your student identity number (SID). If the last digit of your SID is zero, take H = 10m. The normally consolidated clay has a natural moisture content of 45% and a Liquid limit of 50%. Ground investigation results show that the clay is overlain by a 15m layer of sand, and the ground water table is at 10m below ground level. The submerged unit weight and bulk unit weight of the sand layer are 15 kN/m³ and 20 kN/m³ respectively. The vertical stress increase at the centre of the clay layer is 100kPa due to the weight of the structure. Calculate the settlement of the structure due to primary consolidation. Take G =2.7.arrow_forward
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