blows, N content (%) 14 38.4 16 36.5 20 33.1 28 27.0 Plastic limit tests: Students conducted two trials and found that PL= 17.2% for the 1st trial and PL = 17.8% for the second trial. Draw the flow curve and obtain the liquid limit. What is the plasticity index of the soil? (Hint: Use an average value of PL) Determine the flow index. Determine the liquidity index of the soil if the in-situ moisture content is 21%, and comment on the probable engineering behavior of this soil.

blows, N content (%) 14 38.4 16 36.5 20 33.1 28 27.0 Plastic limit tests: Students conducted two trials and found that PL= 17.2% for the 1st trial and PL = 17.8% for the second trial. Draw the flow curve and obtain the liquid limit. What is the plasticity index of the soil? (Hint: Use an average value of PL) Determine the flow index. Determine the liquidity index of the soil if the in-situ moisture content is 21%, and comment on the probable engineering behavior of this soil.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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-1 (a) (b) The results shown in Table QA1 were obtained by a group of students during a laboratory experiment using a standard Proctor test on granular material. Table QA1 Bulk density Water content (Mg/m³) (%) 2 5 6 8 9 1.91 2.24 2.31 1.99 1.4 Using the data in Table QA1, plot the corresponding compaction curve and determine the air content corresponding to the optimum water content and maximum dry density for this soil. Is the air content within the range normally specified when at optimum values? (Note you may Assume: Gs = 2.7 and pw = 1 Mg/m³) Explain why and when it is essential to determine soil density on construction sites.
The following results were obtained from a liquid limit test on a clay using the Casagrande cup device. Number of blows 12 20 28 32 Water content (%) 52.5 47.1 43.2 38.6 37.0 Two determinations for the plastic limit gave water contents of 22.8% and 23.2%. Determine (a) the liquid limit and plastic limit, (b) the plasticity index, (c) the liquidity index if the natural water content is 38% and (d) the void ratio at the liquid limit if G, = 2.7. (e) What is the soil state in the field? (f) Do you expect a brittle type of failure for this soil?
A carefully-weighed 52.9 gram soil sample was dispersed for particle-size analysis using the Bouyoucos hydrometer method. The laboratory was held at a constant temperature of 20 C (68 F). The hydrometer reading after 40 seconds was 20.1 and the hydrometer reading after 8 hours was 5.1. What percentage of particles in the soil sample were clay-sized? Your Answer: Answer units
The results of a Standard Proctor test are given in the following table. Moist Weight of Wet Sol Moisture Content in the mold (Ib) Trial (%) 26 4.08 28 4.12 30 4 4,18 32 Determine: 1. Maximum dry unit weight in Ib/ft^3 (4 decimal places) 2. Optimum water content in % (4 decimal places)
A settling basin is designed with a loading rate of 25 m³ /m².day. The depth of 0.997, the basin is 2 m deep. If the specific gravity of the particles is 1.2 and water = and u= 1.027. Determine the overall removal obtained for a suspension for data are shown below. Time (min) Concentration (ppm) 80 100 180 168 0 60 189 300 130 156 420 27 240 200 111 78
In a falling head permeameter, the sample used is 25 cm long having a cross-sectional area of 24 cm2. The cross-sectional area of the standpipe is 2 cm2. The sample of soil is made of three layers perpendicular to the direction of the flow. The thickness of the top layer is 8 cm and has a value of k1 = 4 x 10-4 cm/sec, the second layer of thickness 10 cm has k2 = 6 x 10-4 cm/sec, and the bottom layer of thickness 7 cm has k3 = 8 x 10-4 cm/sec. Calculate the time required for a drop of head from 25 to 12 cm. ( in minutes).
1. A series of Atterberg limit tests was performed on samples of a gray-brown silty clay. The table below summarizes the results of four liquid limit tests. Using this data, Trial Number Number of blows Weight of wet sample + container (g) Weight of dry sample + container (g) Weight of container (g) 15.61 16.82 16.34 a. Determine the flow curve for the soil (graph and show the equation of the best fit line) b. Determine the flow index for the soil 1 23 2 36 3 26 15.12 4 c. Calculate the liquid limit d. Calculate the plasticity index Plastic limit tests show an average of 38.5%. 23.50 26.94 26.86 26.27 21 19.89 22.10 22.59 21.96
The figure shows a granular soil in a tank having a downward seepage. The water level in the tank is held constant by adjusting the supply from the top and the outflow at the bottom. The void ratio of the soil is 0.50 and the specific gravity is 2.7. H,0 0.8 m 1.1 m A 3.6 m 5.4 m B C Il a plezometer is placed at point B, to what height the water will rise above this point?
a. Compute the liquid limit.b. Compute the plastic limit.c. Compute the natural water content.d. Compute the liquidity index.