Earth is required to be excavated from a borrow pit for building an embankment. The wet unit weight of undisturbed soil is 18kN/m3 and its water content is 8%. The dry unit weight required in the compacted embankment is 15kN/m3 with a moisture content of 10%. Assuming the specific gravity of solids as 2.67, determine the void ratios and the degree of saturation of the soil in both the undisturbed and compacted states. Hint: Apply the basic principles of Phase Relationships in Soil Mechanics

Earth is required to be excavated from a borrow pit for building an embankment. The wet unit weight of undisturbed soil is 18kN/m3 and its water content is 8%. The dry unit weight required in the compacted embankment is 15kN/m3 with a moisture content of 10%. Assuming the specific gravity of solids as 2.67, determine the void ratios and the degree of saturation of the soil in both the undisturbed and compacted states. Hint: Apply the basic principles of Phase Relationships in Soil Mechanics

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter6: Soil Compaction

Section: Chapter Questions

Problem 6.7P

See similar textbooks

Similar questions

a) What are the typical permeability values for clay and sand, respectively? Discuss how the pore pressure in these soils would respond to loading, make use of schematic drawings when needed. b) A sample of silty clay is compacted into a mould 150 mm in diameter and 120 mm high. The mass of soil is 3.527 kg which reduces to 2.594 kg after drying in an oven. Calculate the bulk unit weight of the soil sample. Assuming the specific gravity of the soil grains, Gs = 2.72, calculate the degree of saturation and voids ratio of the soll. c) A site investigation is carried out in Northampton Square for a proposed five storey building. The ground is found to comprise 2 m of coarse gravel overlying London Clay. The gravel has a Gs = 2.65 and a specific volume of 1.573. The clay has a bulk unit weight = 17.9 kN/m³ and a coefficient of earth pressure, Ko= 1.1. The water table is at a depth of 2 m below the ground surface (i.e. level with the top of the London Clay strata). Calculate the vertical…
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/m2
A saturated soil sample has a water content of 34% and void ratio of 0.92. Determine the effective and moist unit weight. Another soil has an effec-tive unit weight of 10.29 kN/m3 and has a void ratio of 0.62, what is this soil’s bulk density and degree of saturation at a water content of 14%. Assume a logical value of Gs with at least 4 significant figures.
The Atterberg limits of of a clay soil are liquid limit = 75 %, Plastic limit = 45 % and shrinkage limit = 25 %. If a sample of this soil has a volume of 30 cm³ at the liquid limit and a volume 16.6 cm³ at the shrinkage limit. Determine the specific gravity of solids.
The Natural ground water table at a site is located at a depth of 2 m below the ground level. Laboratory tests reveal that the void ratio of the soil in 0.85 while the grain size corresponding to 10% fines is 0.05 mm. Determine the depth of the zone of saturation below G.L assume c= 0.3 cm².
Problem G A saturated 110 cu.cm clay sample has a natural water content of 29.85%. It is found that the shrinkage limit occurs when the water content is 18.65%. If the sp.gr. of soil is 2.65. a. Compute the shrinkage ratio. b. Compute the volume of sample when the water content is 16.25%. c. Compute the mass of dry soil sample.
The transformed coefficient of permeability of an equivalent isotropic soil mass is 13 x 10-/ cm/s. Determine the permeability in vertical direction if the permeability in horizontal direction is 3 x 10 7 cm/s.
1. (i) A dry soil has a void ratio of 0.65 and its grain specific gravity is = 2.80. What is its unit weight?(ii) Water is added to the sample so that its degree of saturation is 60% without any change in void ratio. Determine the water content and unit weight.(iii) The sample is next placed below water. Determine the true unit weight (not considering buoyancy) if the degree of saturation is 95% and 100% respectively. 2. A sample of saturated soil has a water content of 35%. The specific gravity of solids is 2.65. Determine its void ratio, porosity, saturated unit weight and dry unit weight 3. For a given soil, the void ratio e, water content w, and specific gravity Gs are found to be 0.50, 15%, and 2.65, respectively. Find: (a) Total unit weight of the soil γt (b) Degree of saturation S (c) Dry unit weight γd if the water in the void is removed 4. A shrinkage limit test for a saturated specimen had the initial volume Vi = 21.35 cm3 and initial weight Wi = 37 gf (…
(b) The representative soil specimen collected from the embankment field has a bulk density of 17.61 kN/m³ and a dry density of 15.89 kN/m³, and the specific gravity of the soil particles is 2.67. During field construction, the soil embankment will be exposed to moisture. (i) Calculate the degree of saturation of the soil. (ii) If the soil embankment specimens have 80% degree of saturation, estimate the weight of water in kN need to be added per cubic meter of the soil
Problem # 4. Specifications for a proposed earth fill require that the soil be compacted to 95% of Standard proctor dry density. Test on glacial till borrow material indicates Ymax= 19.51 kN/m³ at an optimum water content of 12%. The borrow material in its natural condition has a void ratio of 060. If the sp. Gr. Is 2.65 a. Compute the void ratio of the soil. b. Compute the volume of the solids. Compute the maximum volume of the borrow required to make one cu.m. of acceptable compacted fill. C.