9-29. Given the data of Problem 9-11. Evaluate (a) the secondary compres- sion index and (b) the modified secondary compression index if e 2.60 Н, — 2.54 сm P, 2.75 Mg/m At i 0, е 1.74, Н — 1.928 сm At t = 1485 min, e = 1.455, Н 3D 1.728 ст Weight of technioion 1 otono ..11
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- During a subsurface exploration, an undisturbed soil sample was collected in the field using a split-spoon sampler.collected in the field using a split-spoon sampler for laboratory evaluation.sampler) for laboratory evaluation. The sample has a diameter of 1.375in. diameter, 18 in. length, and a wet weight of 1.85 lb. If the oven-dried weight was1.5 lb and Gs = 2.74; calculate the following:(a) Wet unit weight.b) Moisture content.c) Dry unit weight.d) Void ratio.e) Degree of saturation. Translated with www.DeepL.com/Translator (free version)The following readings were obtained from an oedometer test on a specimen of saturated clay, see Table 1. The load being held constant for 24 hour before the addition of the next increment. Applied stress 25 50 100 200 400 800 (kN/m2) Thickness 19.60 19.25 18.98 18.61 18.14 17.68 17.24 (mm) Table 1 At the end of the last load period the load was removed and the sample allowed to expand for 24 hour, at the end of which time its thickness was 17.92 mm and its water content found to be 31.8%. The specific gravity of the soil was 2.66. i. Plot the e/o' curve and determine the coefficient of volume compressibility (m,) for an effective stress range of 220-360 kN/m? ii. Plot the e/log ơ' curve and from it determine the compressibility index (Cc) and the pre-consolidation pressure (Oʻpe) ii. Use the data obtained in (i), (ii) and (ii) to obtain and Plot a mlo' curve for the soil iv. compare the values for consolidation settlement for 4 m thick layer of the clay when the average effective…A sample of 15 concrete cylinders was taken randomly from the production of a plant. The strength of each specimen was determined, giving a sample standard deviation of 215 kN/m2 . Find the 95% confidence interval (with equal probabilities in the two tails) for standard deviation of the strengths. Assume the strengths follow a normal distribution.
- Calculate the mean and standard deviation for the following results for the concentration of lead in a soil sample. 23.2 ppm, 20.1 ppm, 24.7 ppm, 19.9 ppm, 21.8 ppm ○ 27.4±4.2 (n = 5) ppm O 21.9 ±2.0 (n =5) ppm ○ 21.9±3.4 (n = 5) ppm O 22.0 ± 1.8 (n = 5) ppm ○ 27.4±2.0 (n = 5) ppmsolve only 4.2 please. 4.2 Refer to the soil in Problem 4.1. A second group of students conducted only one test and found that the groove on the soil sample closed 12.5 mm when N = 21 and w = 30.4%. Estimate the liquid limit by the one-point method. 4.1 problem is provided below: During Atterberg limit tests in the soil mechanics laboratory, the students obtained the following results from a clayey soil. Plastic limit tests: Students conducted two trials and found that PL = 17.2% for the first trial and PL = 17.8% for the second trial. a. Draw the flow curve and obtain the liquid limit. b. What is the plasticity index of the soil? Use an average value of PL from the two plastic limit trails.A series of three direct shear tests have been conducted on a certain saturated soil. Each test was performed on a 2.375-inch diameter, 1.0 inch tall sample. The test had been performed slowly enough to produce drained conditions. The results of the tests are as follows: Determine the friction angle and cohesion intercept. Test No. Normal Stress (psf) Shear Stress (psf) 2435 1656 2 4870 3571 3 7305 4578
- 4. Given the following data: the porosity obtained from this method is the effective porosity,. Weight of the clean dried core sample in air: Wtdry = 20.0 gm Weight of the core sample saturated with water: Wtsat = 22.5 gm . Density of water: pw = 1.09m CC what is the pore volume of the sample?In a triaxial test of a cohesionless soil, the soil cylinder subjected to a liquid pressure of 12KPa inside the chamber. It observed that failure of the sample in shear occurred when the compressive stress reached 34KPa. The angle of internal friction is nearest to.8, The results of three consolidated-undrained triaxial tests on identical specimens of a particular soil are: Test no. a (kPa) a-a at pcak (kPa) u at peak (kPa) 200 244 55 107 2. 300 314 3. 400 384 159 Determine c and o. What would be the expected pore pressure at failure for a test with 03= 100 kPa? 9, A cylindrical specimen of a saturated soil fails under an axial stress 150 kN/m2 in an unconfined compression test. The failure plane makes an angle of 52° with the horizontal. Calculate the cohesion and angle of internal friction of the soil 10 An undisturbed soil sample, 100 mm in diameter and 200 mm high, was tested in a triaxial machine. The sample failed at an additional axial load of 3 kN with a vertical deformation of 20 mm. The failure plane was inclined at 50° to the horizontal and the cell pressure was 300 kN/m2, Determine, from Mohr's circle, the total stress parameters. A further sample of the soil was tested in a shear box under the same drainage conditions as used for the…
- The following are the results of direct shear tests performed on two identical samples of the soil. In test one, the sample shears at a stress of 180kPa when the compressive normal stress is 208kPa. In test two, the sample shears at a stress 450kPa when the normal stress is 568kPa. Calculate the cohesion of soil. Select the correct response: 42 kPa 24 kPa 0 14 kPaQ¹: Answer only one of the following 1- A series of direct shear rests was conducted on a soil. Each test was carried out till the sample failed. The following results were obtained. Determine the cohesion intercept and the angle of shearing resistance. Sample 1 Normal stress (psi) Shear stresses (psi) 1 2.27 2.6 2 4.55 4.7 3 6.82 5.9 2- What are the common of the laboratory methods for determining the coefficient of permeability of soils? Describe briefly these methods? Q: Multiple choice questions 1- A constant head permeameter is used for Coarse-grained soils (b) Silty soils (c) Clayey soils (d) Organic soils 2- The effective stress controls the following properties of soils: (a) Shear strength (b) CompressibilityPermeability (d) All the above 3- The shear strength of plastic undrained clay depends upon (a) Internal friction) Cohesion (c) Both (a) and (b) (d) Neither (a) and (b) 4-The coefficient of compressibility is the ratio of (a) Change in void ratio to change in effective…A constant-head test was conducted on a sample of soil 15 cm long and 60 cm^2 in cross-sectional area. The quantity of water collected was 50 cm^3 in 20 seconds under a head difference of 24 cm. if the porosity of the sand is 55 % calculate the seepage velocity in cm/s. a. 1.0 x 10^-1 b. 4.3 x 10^-3 c. 3.47 x 10^-2 d. 2.6 x 10^-6