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 0.9843 2,000 0.956 4,000 0.9142 8,000 16,000 32.000 0.8685 0.8228 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.

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 0.9843 2,000 0.956 4,000 0.9142 8,000 16,000 32.000 0.8685 0.8228 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.

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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6 A consolidated-undrained tri-axial test was conducted on a normally consolidated clay sample and the results are as follows: Chamber confining pressure = 115 kPa, Deviator stress at failure = 87 kPa, Pore Water Pressure = 56 kPa. These results were used to determine the drained friction angle of the soil. Compute the deviator stress (kPa) at failure when the drained test was conducted with the chamber confining pressure changed to 159 kPa. Round off to two decimal places.
Following are the results of a laboratory consolidation test on a soil sample: dry mass of soil = 128 gm, specific gravity = 2.75, and area of the sample = 30.68 cm2. Tabulate the value of void ratio of soil sample after each consolidation.
A normally consolidated soil was subjected to tri-axial test with the following data: cell pressure= 320 kPa; The specimen failed when the deviator stress is 460 kPa. Compute the angle of resistance in degrees. a.24.72 b.16.3 c.54.74 d.19.47
The following results were obtained from a liquid limit test on a clay using the Casagrande cup device. Number of blows Moisture content (%) 6 12 20 28 32 52.5 47.1 43.2 38.6 37.0 a) Determine the liquid limit b) If the natural water content is 38% and the plastic limit is 23%, calculate the liquidity index. c) Would you expect a brittle failure? WHY?
Example 4.3 The following compression readings were taken during an oedometer test on a saturated clay specimen (G,=D2.73) when the applied pressure was increased from 214 to 429 kPa: TABLE G 1 Time (min) 1 4 9. 16 25 4 Gauge (mm) Time (min) 5.00 4.67 4.62 4.53 4.41 4.28 4.01 3.75 3.49 36 49 64 81 100 200 400 1440 Gauge (mm) 3.28 3.15 3.06 3.00 2.96 2.84 2.76 2.61 After 1440nmin, the thickness of the specimen was 13.60mm and the water content was 35.9%. Determine the coefficient of consolidation from both the log time and the root time methods and the values of the three compression ratios. Determine also the value of the coefficient of permeability.
Following are the results of a laboratory consolidation test on a soil sample: dry mass of soil = 128 gm, specific gravity = 2.75, and area of the sample = 30.68 cm2. Tabulate the value of void ratio of soil sample after each consolidation.
In a site consisting of normally consolidated clean sands,the water table is at 10 ft depth. The average unit weight ofthe sand above and below the water table is 111.5 lb/ft3 and125.0 lb/ft3, respectively. At a 25 ft depth, N60 was reportedas 26. Determine the following:a. (N1)60 using Liao and Whitman’s (1986) equation for CNb. Dr using Skempton’s (1986) correlation c. Friction angle using Schmertmann’s (1975) correlationd. Modulus of elasticity using Kulhawy and Mayne’s (1990)correlation
A series of identical samples have been tested with drained triaxial test and some of the values are given in the tabulated table 3(Below). Calculate the remaining values as in the blank box. PARAMETER |cell pressure, o3 (kPa) total axial stress, 01 (kPa) pore pressure at failure, u¡ (kPa) |change in volume, Av effective cell pressure, o3' (kPa) effective total axial stress, o,' (kPa) |difference in stress, q (kPa) CD test 150 284 i 1.8 ii i iv O i = 134; ii = 16; iii = 150; iv = 0 O i = 134; ii = 284; iii = 150; iv = 0 O i = 0; ii = 16; iii = 150; iv = 134 O i = 0; ii = 150; iii = 284; iv = 134
Question 15 A consolidated-undrained tri-axial test was conducted on a normally consolidated clay sample and the results are as follows: Chamber confining pressure = 109 kPa, Deviator stress at failure = 98 kPa, Pore Water Pressure = 53 kPa. These results were used to determine the drained friction angle of the soil. Compute the deviator stress (kPa) at failure when the drained test was conducted with the chamber confining pressure changed to 151 kPa. Round off to two decimal places.
8.2
A 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 consolidated-undrained tri-axial test was conducted on a normally consolidated clay sample and the results are as follows: Chamber confining pressure = 115 kPa, Deviator stress at failure = 81 kPa, Pore Water Pressure = 62 kPa. These results were used to determine the drained friction angle of the soil. Compute the deviator stress (kPa) at failure when the drained test was conducted with the chamber confining pressure changed to 159 kPa. Round off to two decimal places.