oven-dry weight is found to be 120 grams, compute the void ratio. a. 0.81 C. 1.52 b. 1.22 d. 0.51
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- 3- 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.A hand-carved sample of soft saturated clay has a volume of 100 cu.cm and weighs 175 grams. If the oven-dry weight is found to be 120 grams; 1. Calculate the water content of the soil. A. 45.80% B. 42.64% C. 29.57% D. 36.40% 2. Solve the void ratio. A. 1.80 B 1.22 C. 0.84 D. 0.52 E. None of the sideA dry sandstone sample of diameter 22 mm and length 35 mm weighs 32 g. the sample is crushed and a pycnometer is used to estimate the grain density having the following date: W3 = 91 g and W4 = 72 g. determine the grain density of sandstone and porosity of the sample.
- The results of a laboratory consolidation test on a clay specimen are the following. Pressure, ir (lb/ft²) 500 1.000 2.000 4.000 8,000 16.000 Total height of specimen at end of consolidation (in.) 0.6947 0.6850 0.6705 0.6520 0.6358 0.6252 Given the initial height of specimen = 0.748 in.. G specimen = 95.2 g. and area of specimen = 4.91 in.²: a. Plot the e-log or curve = 2.68. mass of dry b. Determine the preconsolidation pressure c. Calculate the compression index, C.6 A consolidated-undrained test was conducted on a normally consolidated clay sample. The results are as follows: Undrained angle of friction = 36.90°, Drained angle of friction = 67.62°, Deviator stress at failure = 573 lb/ft^2. Determine the pore water stress at failure in lb/ft^2. Round off to three decimal places.A clay sample, originally 35 mm thick at a void ratio of 1.2 was subjected to a compressive load. After the clay sample was completely consolidated, its thickness was measured to be 25 mm. The final void ratio is
- Given the following lab data, calculate the pore volume compressibility for a sandstone sample at 4,000 and 6,000 psi. Pore volume of the sandstone sample is 50 cm3. Pressure, psi Vol. fluid expelled, cm3 1000 0.244 2000 0.324 3000 0.392 4000 0.448 5000 0.5 6000 0.546 7000 0.596 8000 0.63Following are the results of a consolidation test on a sample of undisturbed clay obtained from the field. Pressure ơ' (kN/m²) Final Height of Specimen (mm) 24 10 23.78 20 23.30 50 22.22 100 20.58 200 19.04 400 17.52 800 16.31 17.75 The height of the specimen at the beginning of the test was 24 mm and the area of specimen was 50 cm? volume of specimen was 120 cm³. The mass of dry specimen was 180.4 g. Gs= 2.68. 1. Plot the e-log ơ' curve, 2. Using Casagrande's method, determine the preconsolidation pressure. 3. Calculate the compression index, CcA clay sample volume and weight are 35 cm3 and 0.50 N, respectively. If assume specific gravity as 2.65, compute the porosity. 45 55 35 40 A
- A sandstone reservoir has an average thickness of 85 feet and a total volume of 7,650 acre-feet. A well was drilled and cored through the reservoir. A rock sample was sent to the laboratory and the following tests were run. The dry weight of the core sample was found to be 140 grams while the sample dimensions were 1.575 in. long and 1.960 in. in diameter. Assuming the compressibility at 4,500 psi is the average compressibility in the reservoir, how much subsidence occurs when the reservoir pressure declines from 5,500 psi to 3,500 psi? What is sample pore volume and porosity? Sandstone density is 2.65 g/cc. Pressure, psi Cumulative pore volume change (-cc) 1000 0.122 2000 0.162 3000 0.196 4000 0.224 5000 0.25 6000 0.273 7000 0.298 8000 0.315Data from an oedometer test for a clay layer are plotted in the graph shown below. Calculate the compression index of the clay specimen. (Answer tolerance = 2%). Data points not to scale.4.15 The following results were obtained from a liquid limit test on a clay using the Casagrande cup device. Number of blows 6 12 20 28 32 Water content (%) 52.5 47.1 43.2 38.6 37.0 (а) Determine the liquid limit of this clay. (b) If the natural water content is 38% and the plastic limit is 23%, calculate the liquidity index. (c) Do you expect a brittle type of failure for this soil? Justify your answer.
