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 5, Problem 5.14P
To determine
Check whether the field compaction meets the specification at the four locations.
Discuss the control test data.
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A field sand cone test is performed on a layer of compacted fill. determined that the fill soil has a maximum dry unit weight of approximately 120 pcf. Determine the relative compaction of the compacted fill. Unit weight of dry uniform of sand: 95 pcf Weight of sand to fill the cone: 1.10 lb weight of jar + cone + sand (before test): 16.5 lb Weight of jar + cone + sand (after test): 10.5 lb Weight of moist soil excavated from hole: 6.60 lb Moisture content of soil from hole: 10 %
10. The results of a Standard Proctoretest is tabulated as follows: (SEE PICTURE)
Determine the maximum dry unit weight of compaction
Determine the optimum moisture content
Determine the void ratio at the optimum moisture content Gs = 2.70
Determine the degree of saturation at the optimum moisture content
A field unit determination test for the soil, yielded the following data. Moisture content = 12% and moist unit weight = 106 pcf. Determine the relative compaction.
PLEASE ANSWER THE 6.5
Chapter 5 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- The following are the data of the compaction test: Volume of mold = 0.000945 m^3 Determine the degree of saturation at the optimum moisture content if Gs= 2.60arrow_forward1. please answer correctly and show solutionsarrow_forwardA sample of soil compacted according to the standard Proct or test has a density of 2.06 g/cm³ at 100% compaction and at an optimum water content of 14%. What is the dry unit weight? What is the dry unit weight at zero air-voids? If the voids become filled with water what would be the saturated unit weight? Assume Gs = 2.67 Air Water Solids Ma + - + M starrow_forward
- The maximum and minimum dry unit weights of a sand were determined in the laboratory to be 16.9 kN/m³ and 14.2 kN/m³, respectively. If the field relative density is 82%? Determine The degree of compaction in the field. Field dry unit weight. Field bulk unit weight if the field moisture content is 15%.arrow_forwardthe maximum and minimum void ratio for sand are 0.805 and 0.501 respectively . The field density test performed on the same soil has given the following result Bulk density 1.81Mg/m3 . water content 12.7% .Assume the specific gravity 2.65 and volume 1m3 . compute the dry density of solids and volume of voids ratio and relative density of sand.arrow_forwardAnswer no.4 Try to answer in 30mins plsssarrow_forward
- 5. please answer correctly and show solutionsarrow_forwarda) 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…arrow_forwardA standard proctor compaction test performed on a sample of soil having Gs= 2.70 obtained a maximum dry unit weight of 90pcf at OMC. A field compacted sample showed a moisture of 28% and a unit weight of 103.70 pcf. Find: (a) the relative compaction (b) the degree of saturation of the field soil compaction.arrow_forward
- A soil sample was compacted. The result of the standard proctor test shows that at 100% compaction, the soil weighs 132.3 pcf with optimum moisture content of 14%. Gs = 2.67 a) What is the saturated unit weight of the soil in pcf? b) What is the maximum dry unit weight of the soil (at zero air voids) in pcf?arrow_forwardAnswer no.1 Try to answer in 30mins plsssarrow_forwardA saturated 100 cm³ clay sample has a natural water content of 30%. It is found that the shrinkage limit occurs when the water content is 19%. If the sp.gr. of soil is 2.70. (3) Compute the shrinkage ratio. Compute the volume of sample when the water content is 15%. Compute the mass of dry soil sample.arrow_forward
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