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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It has been anticipated that the soil under the proposed dam is contaminated, and needs to be removed and backfilled to a depth of 2.5 feet. A Standard Proctor compaction test was conducted on soil from a borrow pit, with the results shown below right. Based on the results:
a) Plot the Proctor curve for the borrow soil.
b) Find the optimum water content and max. dry unit weight for the borrow soil.
c) Determine whether the unit weight of the top layer can be met by compacting to 95% of maximum, and what the range of moisture content for that unit weight is.
d) If we borrow soil from a pit with a void ratio of 0.71, determine how much soil we need to borrow to backfill below the dam to match the in-situ void ratio of the top layer of soil.
A 1 m thick soil with an initial void ratio of 0.94 was compacted by a roller and its thickness reduced by 0.09 m. The specific gravity of this soil is 2.65. A 178.0 g soil sample was collected from the compacted soil mass to examine the degree of compaction. The sample was dried in an oven for 24 hours and it had a dry mass of 142.4 g.
Determine the degree of saturation of the soil after the compaction.
For a silty clay soil given LL = 43 and PL = 18. Estimate the maximum dry unitweight of compaction that can be achieved by conducting a modified Proctor test. Use Eq attached.
Chapter 5 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- Sand is used in the cone is known to have a bulk density of 15.74 kN/m3 Wet weight=20.601 N Dry weight =17.926 N Weight of sand to fill test hole =16.053 N a) Determine the in-place dry density of the tested soil (Ans. 17.57 kN/m3) b) Determine the water content (Ans. 15%) c) Compute the percentage of compaction of the tested soil if the laboratory moisture density curve indicates a dry density of 18.1 kN/m3 and an optimum moisture content of 13%. (Ans. 97.07%)arrow_forwardResults of a standard proctor ompaction test on a silty sand are shown. PLEASE COMPLETE SOLUTION. 1) Find the maximum dry unit weight and optimum moisture content. 2) What is the moist unit weight at optimum moisture content? 3) What is the degree of saturation at optimum moisture content? Given: ?? = 2.69 4) If the required field dry unit weight is 18.5 ??/?3, what is the relative compaction? 5) What should be the range of compaction moisture contents in the field to achieve the above relative compaction? 6) If the minimum and maximum void ratios are 0.31 and 0.82, respectively, what is the relative density of compaction in the field?arrow_forwardFor a given sandy soil, the maximum and minimum void ratios are 0.77 and 0.41, respectively. If Gs=2.66 and w=9%, what is the moist unit weight of compaction (kN/m3) in the field if Dr=90% ? For a given sandy soil, emax=0.75 and emin=0.52. If Gs=2.67 and Dr=65% determine the void ratio and the dry unit weight.?arrow_forward
- Assuming the fill soil does not change properties, how can the compated soil density exceed 100% standard proctor? a) Increased compaction energy b)Increased Strength c) Increased Plasticity Index d) Decreased permeabilityarrow_forwardA sand cone test has been performed in a recently compacted fill. The test results obtained are as shown in Table 3(b). (i) Determine the dry density of compaction in the field (ii) Calculate the maximum dry density from standard Proctor test if the relative compaction is 90%. (iii) Determine the degree of saturation of the compacted fill if the specific gravity of the soil is 2.65.arrow_forwardAn undisturbed sample of clay is found to have a wet weight of 63 lb, a dry weight of 51 lb, and a total volume of 0.50 ft3. If the specific gravity of soil solids is 2.65, determine the water content, void ratio, and degree of saturation.arrow_forward
- An undisturbed soil sample has a void ratio of .56, water content of 15%, and specific gravity of solids of 2.64. Find the wet and dry unit weights in lb/ft3, porosity, and degree of saturation. Assume a total volume of 1 ft3.arrow_forwardA clayey silt with initial unit weight of 17.8 kN/m3 at water content of 35% obtained from site is mixed with 15% by weight of water to achieve 75% degree of saturation. Given the specific gravity of the soil is 2.7. determine void ratio and dry unit weight of the soil sample.arrow_forward1. A soil sample has a maximum void ratio of 0.85 and minimum void ratio of 0.55. It was also found out that the porosity is 23%, moisture content is 12% and Gs = 2.65. Compute the dry unit weight of the sample. 2. Estimate the compression index of soft clay with moisture content of 56.4 percent. The liquid limit is 56 percent.arrow_forward
- An embankment has a mass density of 1900 kg/m3. Laboratory test shows that the soil has a dry density of 1550 kg/m3 and the void ratio at its loosest and densest states were 0.85 and 0.42, respectively. The specific gravity of soil particles is 2.66. Determine the relative density of the embankment.arrow_forwardAn embankment has a mass density of 1900 kg/m3. Laboratory test shows that the soil has a dry density of 1550 kg/m3 and the void ratio at its loosest and densest states were 0.85 and 0.42, respectively. The specific gravity of soil particles is 2.66. a. Determine the relative density of the embankment. b. Determine the moisture content of the embankment.arrow_forwarda. A soil specimen with volume of 0.60x10-4 m3 , weighs 0.105 kg. Its dry weight is 0.0802 kg, and Gs is 2.65. Compute • Water content m, % • Void ratio e and porosity n Degree of saturation Sr, %arrow_forward
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