Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 2, Problem 2.3P
To determine
Find the new void ratio and moist unit weight of soil.
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2.3
The top 500 mm of a site consists of a clayey sand with void
ratio of 0.90 and water content of 20.0%. The specific grav-
ity of the soil grains is 2.68. When the ground is compacted
at the same water content, there is 45 mm reduction in the
thickness of this layer. Determine the new void ratio and the
moist unit weight of the soil.
1. The relative compaction of a clayey sand in the field is 90%. In the laboratory, the maximum dry unit weight is 115 ??/??3. If the soil layer before compaction had a void ratio of 0.97 and a thickness of 5.5 ft. What would be the final thickness after compaction? Assume ?? = 2.67.
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A fine, dry sand with an in-place unit weight of 17. 28 KN/m^3 has a spocific gravity of solids of 2.62. The void ratio at its densest condition is 0.368 and the void ratio at the loosest condition is 0.938.
Determine the relative density of the soil.
Chapter 2 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- The top 500 m of a site consists of a clayey sand with void ratio of 0.90 and water content of 20.0%. The specific gravity of the soil grains is 2.68. When the ground is compacted at the same water content, there is 45 mm reduction in the thickness of this layer. Determine the new void ratio and the unit weight of the soil. Show handwritten solutionsarrow_forward2-13. The wet unit weight of a soil sample is 18.55 kN/m³. Its specific gravity of solids and water content are 2.72 and 12.3%, respectively. Find the dry unit weight, void ratio, and degree of saturation. 2-14. A fine sand has an in-place unit weight of 18.85 kN/m³ and a water content of 5.2%. The specific gravity of solids is 2.66. Void ratios at densest and loos- est conditions are 0.38 and 0.92, respectively. Find the relative density.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
- The relative compaction of a 4-m thick sand in the field is 79.34% and moisture content of 10.44%. The maximum and minimum dry unit weights of the sand are 108.66 lb/ft3 and 63.41 lb/ft3, respectively. If the specific gravity of the sand in the field is 2.644, determine the following: a. Bulk unit weight of the soil in the field, in lb/ft3. b. Relative density in the field, in %. c. Thickness of sand to satisfy a compaction requirement in the site to about 95%.arrow_forwardA certain saturated sand (S = 100%) has a moisture content of 27.9% and a specific gravity of solids of 2.61. It also has a maximum index void ratio of 0.90 and a minimum index void ratio of 0.33. Compute its relative density and classify its consistency. (Table on the right) Solution: Given the values of mmoisture content, specific gravity and degree of saturation, the void ratio can be estiamted as: e = Thus the relative density is found to be Dr = • According to the table, the soil is classified as %; soil. TABLE 3.3 CONSISTENCY OF COARSE-GRAINED SOILS AT VARIOUS RELATIVE DENSITIES (data from Lambe and Whitman, 1969) Relative Density, D,(%) 0-15 15-35 35-65 65-85 85-100 Classification Very loose Loose Medium denseª Dense Very dense "Lambe and Whitman used the term "medium," but "medium dense" is better because "medium" usually refers to the particle size distribution.arrow_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
- 3. A sand has a natural water content of 5% and bulk unit weight of 18.0 kN/m3. The void ratios corresponding to the densest and loosest state of this soil are 0.51 and 0.87. Find the relative density and degree of saturation.arrow_forwarda. The moisture content of the soil specimen is 20%, and the total weight is 300 gr. Calculate the void ratio and degree of saturation if the total volume was 180 cm3. (Gs = 2.5) b. A soil layer with a moisture content of 10 percent and a unit weight of 16.5 KN per cubic meter has a decrease in volume by 10 percent after compaction. Find the dry specific weight of the soil.arrow_forwardDuring a consolidation test, a sample of fully saturated clay 3 cm thick is consolidated under apressure increment of 4500 lb/ft2. When equilibrium is reached, the sample thickness is reduced to2.60 cm. The pressure is then removed and the sample is allowed to expand and absorb water.The final thickness is observed as 2.8 cm and the final moisture content is determined as 24.9%. Ifthe specific gravity of the soil solids is 2.70, find the void ratio of the sample before and afterconsolidationarrow_forward
- 6 Problem: The max. dry unit weight determined in the laboratory for a quart sand is 102 lb/ft3. In the field, the relative compaction is 90%. Specific gravity of sand is 2.70. a) Determine the void ratio at the max. dry unit weight condition. Determine the void ratio of the sand in b) the field condition.arrow_forward(i) (ii) The atterberg limits of a clay are: LL = 60%, PL = 45% and SL = 25%. The specific gravity of soil solids is 2.70 and the natural moisture content is 50% What is its state of consistency in nature? Calculate the volume to be expected in the sample when moisture content is reduced by evaporation to 20%. Its volume at liquid limit is 10 cm ³.arrow_forwardFollowing table presents information for a fine-grained soil: Current effective stress (kPa) Current void ratio of the soil Overconsolidation Ratio (OCR) Compression index (Cc) Re-compression index (Cr) 30 0.96 7.06 0.18 0.06 Determine the void ratio of the soil at the preconsolidation pressure.arrow_forward
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