16. Which of the following is/are correct?1. Clays are generally compacted by Vibratory rollersII. Clays are generally compacted by Sheepsfool rollersIII. Clays are generally compacted by dynamic compactionIV. Granular soils are generally compacted by static loadsV. Granular soils are generally compacted by vibratory loadsa 1&11b. ll only c ll&NV d. ll&NV en&v17.Al optimum water content, which of the following is not true?a dry density is the maximumb. permeability is the minimumc. porosity is the minimumd. strength is the maximume None of the above18. Compacting a clay wet of optimum results ina more flocculated clay fabricb. more strengthc. higher shrinkaged. higher permeabilitye None of the above

This question is related to the Soil Mechanics from Civil Engineering. I solved all three questions…

Answered: 16. Which of the following is/are…

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter11: Ground Improvement

Section: Chapter Questions

Problem 11.9P

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The embankment for a highway 5097 ft long, 104 ft wide and 6 ft in compacted thickness is to be constructed from a sandy soil trucked from a borrow pit. The water content of the sandy soil in the borrow pit is 6.748% and its porosity is 0.422. The specification requires the embankment be compacted to a dry unit weight of 122.874 lb/ft3. The specific gravity is 2.588. Determine the following: a. Total weight of the soil solids, kips. b. Total volume of the soil required from the borrow pit, ft3. c. Weight of water to be added per foot length of the embankment to reach 10% moisture content, lb.
The soil profile at a site consists of a 2.0 m thick sand layerat the top, underlain by a 3.0 m thick clay layer. The watertable lies at a depth of 1.0 m below the ground level. Thebulk and saturated unit weights of the sand are 16.0 kN/m3and 19.0 kN/m3, respectively. The properties of the clay are:water content = 45.0%, specific gravity of the soil grains =2.70, compression index = 0.65, swelling index = 0.08, andoverconsolidation ratio = 1.5.a. The ground level is raised by placing a 1.5 m high compactedfill with unit weight of 20.0 kN/m3. What is theconsolidation settlement?b. When the consolidation due to the fill is completed,it is proposed to construct a warehouse imposing a uniform pressure of 40.0 kN/m2. What would be theconsolidation settlement due to the construction of thewarehouse?
The following data are given for overconsolidated clay: Gs=2.71 LL=45 Average Pressure=120 kPa e=0.8 thickness=4m Change in Pressure =40 kPa Cs=1/5 Cc Determine the following 1. Compression Index (Ans. 0.315) 2. Pre-consolidation Pressure (Ans. 92.9 kPa) 3. Primary Consolidation Settlement (Ans. 49 mm)
A soil profi le consists of a clay layer underlain by a sandlayer, as shown in Figure P7.17. If a tube is inserted intothe bottom sand layer and the water level rises to 1 mabove the ground surface, determine the vertical effective stresses and porewater pressures at A, B, and C. IfKo is 0.5, determine the lateral effective and lateral totalstresses at A, B, and C. What is the value of the porewater pressure at A to cause the vertical effective stressthere to be zero?
A granular soil with Gs =2.65, emax = 0.870, and emin= 0.515 is compacted to a moist unit weight of 110.4 lb/ft3 at moisture content of 10.5%. What is the relative density of this compacted sand?
Define the Bearing Capacity of Layered Soil: StrongerSoil Underlain by Weaker Soil (c9 2 f9 soil) ?
‘mormally consolidated clay given: 1S kKN/m® ateo=122 = 430 KN/m? ate=098 * 10° m/sec, Find: long in days will it take for a 3 m thick lsyer of the same drained both sides in the field to reach 50% consolidation? is settlement at 50% consolidation?
The soil arrangement shown carries 1.76 meter square footing with a column load of 583 kN. properties of sand: Above water table = 17.54 kN/m3, below water table = 18.51 kN/m3. Properties of clay: 17.03 kN/m3, Cc = 0.382, void ratio = 0.65. Use H1 = 6m, H2= 4m, H3 = 4m, Df = 1m. Determine the settlement of the normally consolidated clay in mm. Round off to three decimal places.
Specifications for a proposed earth fill require that soil be compacted 95% of standard proctor dry density. Tests on a glacial-till borrow material indicate that the maximum unit weight is 124 lb/ft3 at an optimum water content of 12%. The borrow material in its natural condition has e=0.6. If Gs=2.65 a) determine the dry unit weight of soil in the embankment. (Ans.117.8 lb/ft3) b) determine the dry unit weight in the borrow area. (Ans. 103.52 lb/ft3) c) Determine the minimum volume of borrow required to make 1 ft3 of acceptable compacted fill. (Ans. 1.14 ft3)
A soil has an “in-situ” (in-place) voids ratio e0 = 1.87, ωN = 60%, and GS = 2.75. Note: All soils are really “moist” except when dry, that is when ω= 0%. 1. What is moist unit weight, ɣ(moist)? a. 20.15 kN/m³ b. 15.04 kN/m³ c. 25.05 kN/m³ d. 13.23 kN/m³ 2. What is degree of saturation, S? a. 75.14% b. 95.35% c. 67.08% d. 88.24%
2. The soil arrangement shown carries 1.68-meter square footing with a column load of 560 kN. Properties of sand: Above water table = 17.35 kN/m3, Below water table = 18.69 kN/m3. Properties of clay: 17.71 kN/m3, Cc = 0.382, void ratio = 0.66. Use H1 = 5 m., H2 = 4 m., H3 = 5 m., Df = 1 m. Determine the settlement of the normally consolidated clay in mm. Round off to three decimal places.
The soil profile at a site consists of 2 m of sand at the groundlevel, underlain by 6 m of clay, followed by a very stiff claystratum that can be assumed to be impervious and incompressible.The water table is at 1.5 m below the ground level. Themoist and saturated unit weights of the sand are 17.0 kN/m3and 18.5 kN/m3, respectively. The clay has an initial void ratioof 0.810, saturated unit weight of 19.0 kN/m3, and coefficientof consolidation of 0.0014 cm2/s.a. When the ground is surcharged with 3 m high compactedfill with moist unit weight of 19.0 kN/m3, the settlementwas 160 mm in the first year. What would be the consolidationsettlement in the first two years?b. If the clay is normally consolidated, what is the compressionindex of the clay?

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