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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5. A consolidated, undrained triaxial test is being carried out on a normally consolidated clay where c - 0 and p'= 26'. The triaxial specimen was consolidated under a cell pressure of 300 kPa and backpressure of 80 kPa. Skempton's A parameter at failure is estimated to be 0.80. The drainage valve has since been dosed and the vertical deviator stress increased to failure. What would be the deviator stress and pore water pressure at failure?
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.
A) The results of two consolidated-drained triaxial tests on clay are given below in Table 2. Table 2: Results of CDT tests. Specimen Chamber Pressure I II 3, kPa 110 220 Deviator Stress 01-03, kPa 220 400 a) Calculate the shear strength parameters of the soil. b) What are the normal and shear stresses on a plane inclined at 38° to the major principal plane for Specimen I? c) What are the normal and shear stresses on the failure plane at failure for Specimen II? B) The laboratory test results of a standard Proctor test are given in the following table.
A series of direct shear tests were performed on a soil sample. Each test was carried out until the specimen sheared (failed). The laboratory data for the tests are tabulated as follows. Sample No. Normal stress (kN/m?) Shear stress (kN/m?) 1 10 22 2 20 26 3 30 30 50 37 Determine the shear strength parameters. What is the type of the soil? Plot the relationship between the shear displacement and shear stress also draw the failure envelope.
The following data are given for the laboratory sample. go' = 175 kPa ; e = 1.1; 00¹+ Ago' = 300 kPa ; e = 0.9 If thickness of the clay specimen is 25 mm, the value of coefficient of volume compressibility is x 10-4 m² /kN
A consolidated-undrained tri-axial test was conducted on a normally consolidated clay sample and the results are as follows: Chamber confining pressure = 112 kPa, Deviator stress at failure = 90 kPa, Pore Water Pressure = 67 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 156 kPa. Round off to two decimal places.
4. The construction of a 10m x 10m square water tank in a residential neighbourhood has been planned. As indicated in Figure below, a 6m thick soft clay layer was discovered between sand layers during site exploration. For laboratory studies, an undisturbed soil sample was obtained in the middle of the soft clay layer. The findings of the laboratory consolidation test are listed below. Pressure, o' (kN/m2) | 25 50 100 200 400 800 Void Ratio, e 1.28 1.26 1.22 1.14 1.05 0.95 i. Find the preconsolidation pressure (o'c), Virgin, and Laboratory Compression Index using the information above (Cc). Find the primary consolidation settlements that will occur at the water tank's centre due to compression of the soft clay layer ii. 10 m Load = 18,000 kN Ground Level 1 m Ground water level Dense Sand, y= 20 kN/m³ 2 m Soft Clay Kat = 16 kN/m³ ; eo= 1.38 Cc = graph? ; Cs =Cc; o' = graph? 6 m %3D %3! Very Dense Sand
Data from an oedometer test using a clay specimen are plotted in the graph shown below. If the compression index is equal to 0.6, calculate the void ratio (e2) missing at Point C, which is associated with a vertical effective stress equal to 105 kPa
A sample of moist sand was subjected to a series of triaxial tests. The soil fails under the following stresses Cell pressure, σ3 Plunger stress, σd Sample 1 11 kPa 20 kPa Sample 2 26 kPa 31 kPa What is the angle of internal friction and cohesion of the soil? Please answer this asap. For upvote. Thank you very much
A consolidated-undrained tri-axial was conducted on a normally consolidated clay sample and the results are as follows: chamber confirming pressure = 107 kPa, Deviator stress at failure = 95 kPa, Pore Water Pressure = 50 kPa. these results were used to determine the drained friction angle of the soil. Compute the deviator stress in kPa at failure when the drained test was conducted with the chamber confirming pressure changed to 160 kPa
Table 1 gives data from a standard shearbox(direct shear) test on a sample of 125g of dry sand. The initial dimensions of the sample were 60mmx60mm on plan x20mm in height. The test was camried out at a constant normal effective stress of 50kPa. Take the specific gravity of the soil grains Gs=2.65. Plot graphs of (a) shear stress r against shear strain y; (b) volumetric strain evol against shear strain y; (c) specific volume v against shear strain y. (d) Comment on these graphs and estimate the peak and critical state effective angles of friction of the soil. Table 1: Shearbox Data Relative horizontal displacement x (mm) of shearbox lid y (mm) Upward vertical movement Shear stress t (kPa) 0.00 0.000 0.02 0.002 19 0.04 0.008 34 0.06 0.016 43- 0.08 0.026 47 0.20 0.064 56 0.32 0.128 51 0.48 0.192 46 0.64 0.256 41 0.80 0.288 37 0.96 0.320 34 1.12 0.321 33
A consolidated undrained tri-axial test was conducted on a normally consolidated clay sample and the results are as follows: chamber confining pressure = 110kpa deviator stress at failure = 96kpa pore water pressure = 66kpa these test results were used to determine the drained friction angle of the soil. compute the deviator stress in (kpa) at failure when the drained test was conducted with the chamber confining pressure changed to 163kpa.