A saturated silty clay encountered in a deep excavation is found to have a water content of 27.4%. Use Gs=2.52. Determine the air content(in decimal form). Answer in TWO(2) decimal places.
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- ANSWER MUST BE: (a) t50 = 8.37 years, (b) t90 = 35.96 years, (c) U ≈ 17%, (d) U ≈ 39% A clay specimen was tested in a laboratory consolidation device, whichwas 12.7 mm (½ in.) thick and the top and the bottom boundaries weredrained. A 50% consolidation time on the specimen was obtained as28.4 minutes. Determine the following:(a) Time for 50% consolidation in the field with this soil with a 2.5 mthickness where only the top layer is drained (b) Time for 90% consolidation in the field with this soil with a 2.5 mthickness where only the top layer is drained (c) For the same field condition above, at the end of 1 year after theplacement of load, how much primary consolidation settlementoccurs relative to its final amount of the settlement? (d) The same question as in (c), but at the end of 5 yearsQ: For the soil profile shown in figure. Find: a) Final consolidation settlement. b) Time required for 60% consolidation. c) Pore water pressure after 18 months. d) Piezometer reading above point (A) immediately after applying the load. Surcharge Aq.= 100 kPa Sand y=15kN/m’ 7kN/ m® Piezometer t AT ol g thefity iThe coefficient of permeability of a sand at a void ratio of 0.62 is 0.03 cm/s. Estimate the coefficient of permeability at a void ratio of 0.48 using Casagrande equation.
- The total density of sand in an embankment was found to be 1900kg/m^3 and the field water content was 12% . In the laboratory, the density of the solid was found to be 2660 kg.m^3, and the maximum and minimum voids ratio were 0.63 and 0.44, respectively What is the void ratio of the sand? Calculate the relative density of the sand in the field:The results of a laboratory consolidation test on a clay sample are given below: Pressure, p (kN/m²) Void ratio, e 23.94 1.112 47.88 1.105 95.76 1.080 191.52 0.985 383.04 0.850 766.08 0.731 (43) a) Draw an e-log p plot. (44) b) Determine the pre-consolidation pressure, p. . (45) c) Find the compression index, Ce. Appendix For ø=35°, N¸=57.8, N,=41.4, and N,=41.1. o,'=0;'tan²| 45°+ +2c tan| 45°+|!;9 ELABORATE Try solving the following problem: Practice Problem: The following are the results of a consolidation test on a sample soil: a. Plot the e-log o' curve b. Using Casagrande's method, determine the preconsolidation pressure. c. Calculate the compression index, Cc e 1.1 1.085 1.055 1.01 0.94 0.79 0.63 Pressure, o' (ton /ft²) 0.25 0.50 1.00 2.00 4.00 8.00 16.00
- The coefficient of permeability of sand at a void ratio of 0.80 is 0.47 mm/s. Estimate the coefficient of permeability of this sand at a void ratio of 0.50.Determination of void ration and coefficient permeabilitySolve as soon as possible -- The following data are given for a channel-type grit chamber of length 7.5 m. 1. Flow through velocity = 0.3 m/s 2. The depth of waste water at peak flow in the channel = 0.9 m 3. Specific gravity of inorganic particles = 2.5 4. g 9.80 m/s², μ = 1.002 x 10-3 N-s/m² at = 20°C, Pw = 1000 kg/m³ Assuming that the Stoke's law is valid, the smallest diameter particle that would be removed with 100% efficiency is
- 3- A sand sample is subjected to drainage cutting test with a hollow cylinder device. Rupture occurs with increasing internal pressure while external pressure is constant. At the moment of rupture, the external stress is 200 kPa and the internal stress is 300| Kilopascals - be. Internal and external radii of the sample are 40 and 60 mm. A) Obtain the angle of soil friction. B) At the moment of rupture, what is the axial stress applied to the sample?9. The following are the details for the backfill material in a vibroflotation project. D10=0.36 mm D20 0.52 mm D25=0.60 mm D50=1.42 mm D75 1.65 mm a. Find the suitability number. b. Determine the rating. c. Determine the sorting coefficient.****PROVIDE STEP BY STEP SOLUTION SOLVING H1 AND H2 VALUES in part B***** A constant head permeability test is performed on soil that is 2 cm x 2 cm square, and 2.5cm long. The head difference applied during the test is 20 cm and 7 cm3 is collected over a time of 100 sec. Provide step by step solution. a) Compute the permeability based on these test conditions and results. b) A falling head test is conducted on the same soil specimen at the same time (t1 – t2 = 100 sec), and the standpipe diameter is 0.8 cm. If the average head during the test should be 18 cm, what are h1 and h2 values, provide step by step solution solving h1 and h2 values.