MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, 9th Edition, [Instant Access], 2 terms (12 months)
9th Edition
ISBN: 9781305971257
Author: Braja M. Das; Khaled Sobhan
Publisher: Cengage Learning US
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Chapter 4, Problem 4.10P
To determine
Find the shrinkage limit and shrinkage ratio.
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During an oedometer test on a specimen of saturated clay, the thickness of the
specimen decreased from 19.931 mm to 19.720 mm under an increment of stress
from 200 to 400 kPa which was maintained for 24 hours. The stress was then
removed from the specimen, its thickness was measured as 19.842 mm, and its
water content determined as 26.8%.
Taking Gs of the particles to be 2.7o, calculate the void ratio before and after the
application of the stress increment, and the coefficient of volume decrease (m,) for
this stress range. (Ans: e;= 0.731, e2= 0.713, m, = 0.052 m/MN)
During an oedometer test on a specimen of saturated clay, the thickness of the
specimen decreased from 19.931 mm to 19.720 mm under an increment of stress
from 200 to 400 kPa which was maintained for 24 hours. The stress was then
removed from the specimen, its thickness was measured as 19.842 mm, and its
water content determined as 26.8%.
Taking Gs of the particles to be 2.70, calculate the void ratio before and after the
application of the stress increment, and the coefficient of volume decrease (m,) for
this stress range. (Ans: e,= 0.731, ez= 0.713, m, = 0.052 m²/MN)
A sample of moist sand taken from the field was found to have a moisture content of 14% and a porosity of 38%. In the laboratory test that simulates field conditions, it was found that at its densest state, its void ratio is 85% and at its loosest state its void ratio is 40%. Determine the void ratio.
Select one:
a. 0.79
b. 0.57
c. 0.61
d. 0.42
Chapter 4 Solutions
MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, 9th Edition, [Instant Access], 2 terms (12 months)
Ch. 4 - During Atterberg limit tests in the soil mechanics...Ch. 4 - Prob. 4.2PCh. 4 - Prob. 4.3PCh. 4 - Results from a liquid limit test conducted on a...Ch. 4 - The following data were obtained by conducting...Ch. 4 - Refer to the soil in Problem 4.5. Using the...Ch. 4 - Following results are obtained for a liquid limit...Ch. 4 - Prob. 4.8PCh. 4 - Prob. 4.9PCh. 4 - Prob. 4.10P
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- A sample of moist sand taken from the field was found to have a moisture content of 14% and a porosity of 38%. In the laboratory test that simulates field conditions, it was found that at its densest state, its void ratio is 85% and at its loosest state its void ratio is 40%. Determine the void ratio. Select one: O a. 0.42 b. 0.61 c. 0.79 d. 0.57 It is the densification of soil by removal of air which require mechanical energy. Select one: a. solidification b. consolidation C. compression d. compaction What particular sand is ideal for field density test using sand cone method? Select one: O a. clean sand b. Ottawa sand c. Owatta sand d. white sandarrow_forwardA clean sandstone core sample with diameter of 3.8 cm and length of 5.6 cm is saturated with a brine. The core was desaturated in several steps, and the resistance was measured at each saturation. The results are as follows: Water Saturation (Fraction) Resistance (k2) 1.000 1.302 0.900 1.695 0.800 2.283 0.730 2.878 0.640 3.775 0.560 5.637 0.480 7.838 0.375 13.175 0.350 17.050 0.300 26 Brine resistivity= 0.74 Qm Archie coefficient =1.03 Cementation factor= 2.2147 (1) Estimate the rock porosity. (2) Determine the saturation exponent. (3) Estimate the amount of oil and brine (in cc) in the core sample when resistivity index is 5. All steps of the calculations should be shown.arrow_forwardA sample of silty sand in its natural conditions had a volume of 120cm3 and weighed 149g. After saturating the sample with water, it weighed 188g. The sample was then drained by gravity until it reached a constant weight of 133g. Finally the sample was oven dried for 2 days at 221 degrees fahrenheit after which it weighed 120 g. Note that the volume of the voids in the sample under natural conditions is the volume of water in the sample at saturation. Assuming that the density of water is 1 g/cc. Perform the following calculations: a) Water content on a mass basis under natural conditions b) Specificyield c) Specific retention d) Totalporevolume e) Porosity under natural conditionsarrow_forward
- Problem 2: During a shrinkage limit test, a 19.3 cm³ saturated clay sample with a mass of 37 g was placed in a porcelain dish and dried in the oven. The oven-dried sample had a mass of 28 g with a final volume of 16 cm³. Determine the shrinkage limit and the shrinkage ratio. Problem 3: In a shrinkage limit test, a sample of saturated clay was dried in the oven. The dry mass of the soil was 22.5 g. when the moisture content is at the shrinkage limit, the soil reaches a constant total volume, Vf= 10.3 cm³. calculate the shrinkage limit of the soil. (Given: G3=2.72)arrow_forwardThe following results were obtained by testing a sample of clay: water content 25.6%, liquid limit 43.5%, plastic limit 19.1%. From this compute the following: (a) Liquidity Index (b) Plasticity Index (c) Shrinkage Limitarrow_forward5. Triaxial tests were conducted on undisturbed samples of clay under CU conditions. Data from the test are summarized in the Table 2. Graph the Mohr's circles and draw in the failure envelope. Determine the strength parameters c' and ("? Table 2. Data from CU Tests Cell pressure (3 (kPa) 359 719 719 Test A B C Pore pressure at Failure u (kPa) 339 585 451 Deviator Stress at Failure. (1-(3 (kPa) 539 731 1015arrow_forward
- Problem#1: An undisturbed sample of silty sand was brought to the laboratory at its natural water content, and the following measurements were made: Total mass at the natural water content: 1523.6g Mass of oven-dried sample: 1318.3g Total volume of sample: 728.2cm3 Density of the mineral solids: 2.7g/cm3 Calculate the porosity n, void ratio e, volumetric water content 0 and dry bulk density pb.arrow_forward3- Following are the results of a laboratory consolidation test on a sample of undisturbed clay obtained from the field. Final height of specimen (in) Pressure, o' (lb/ft') 1 0.9917 1,000 2,000 4,000 0.9843 0.956 0.9142 8,000 0.8685 16,000 0.8228 32.000 The height of the specimen at the beginning of the test was 1.0 inch, and the diameter was 2.5 inches. The moist specimen weighed 0.31 lb and the water content was determined to be 19%. Estimate the compression index and the preconsolidation pressure from the e-log o' curve. (Plot in Excel) Given: Gs = 2.7.arrow_forwardSaturated clay has a volume of 18.9 cm^3 and a mass of 30.2 gm. On oven drying the mass reduces to 18 gm. The volume of dry specimen as determined by displacement of mercury is 9.9 cm^3. Determine the 1. shrinkage limit 2. specific gravity 3. shrinkage ratioarrow_forward
- An undisturbed sample of saturated clay has a volume of 16.5 cm3 and weighs 35.1 g. On oven drying, the weight of the sample reduces to 29.5 g. Determine the porosity in percentarrow_forwardA sample of clay was coated with paraffin wax and its mass, including the mass of wax, was found to be 697.5g. The sample was immersed in water and the volume of the water displaced was found to be 355 mL. The mass of the sample without the wax was 690g and the water content of the representative specimen was 18%. If specific gravity of soil solids and the wax is 2.7 and 0.89 respectively, solve for the degree of saturation.arrow_forwardDuring a consolidation test, an increment pressure of 153 kN/m2 was applied to a sample of saturated clay initially 20 mm thick. When equilibrium was reached the thickness of the sample was reduced to 18.3 mm. The pressure was then removed and the sample was allowed to expand. The final thickness was recorded as 19.3 mm and the final moisture content was 30.1%. If the specific gravity of the particles is 2.65 and the sample was saturated throughout the test, determine the following: 8.1 Voids ratio before and after consolidation. 8.2 The average coefficient of volume change over the range of pressure appliedarrow_forward
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