». Consolidated undrained triaxial tests are perform remoulded clay with pore pressure measurements. The observations are recorded in the table below: Test No. 1 2 Consolidation Pressure (kPa) 250 350 Cell pressure at failure (kPa) 250 350 Deviator stress at failure (kPa) 179 242 Pore pressure at failure (kPa) 101 145 Determine the values of the shear strength parameters, cohesion and friction, for the clay both in terms of total and effective stresses. If in the consolidated undrained test, an identical specimen is first consolidated under a cell pressure of 400 kPa, what would be the deviator stress at failure?

». Consolidated undrained triaxial tests are perform remoulded clay with pore pressure measurements. The observations are recorded in the table below: Test No. 1 2 Consolidation Pressure (kPa) 250 350 Cell pressure at failure (kPa) 250 350 Deviator stress at failure (kPa) 179 242 Pore pressure at failure (kPa) 101 145 Determine the values of the shear strength parameters, cohesion and friction, for the clay both in terms of total and effective stresses. If in the consolidated undrained test, an identical specimen is first consolidated under a cell pressure of 400 kPa, what would be the deviator stress at failure?

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter2: Geotechnical Properties Of Soil

Section: Chapter Questions

Problem 2.18P

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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?
5. A consolidated, undrained triaxial test is being caried out on a normally consolidated clay where c = 0 and 41= 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?
Following are possible testing to determine the shear strength of clay in the laboratory, please choose the correct and appropriate combination for lab testing. I. Direct shear test II. Unconfined Compressive Strength III. Vane Shear test IV. Standard Penetration Test V. Consolidated Isotropic Drained triaxial test VI. Dutch Cone penetrometer O All above O 1,1Il and II O 1,1II and VI O IV, V, VI
A consolidated tri-axial test was conducted on a normally consolidated clay. The results were as follows: Chamber confining pressure = 326 kPa, Deviator stress = 414 kPa. Compute for the shear stress on the failure plane in kPa. Round off to two decimal places.
A series of unconsolidated undrained (UU) triaxial compression tests have been performed on two "identical" clay specimens. The test results are as follows: Test Number Confining Pressure (kPa)| Deviator Stress at Failure (kPa) 102 96 (i) (ii) 1 2 50 100 Plot the total stress Mohr circles for both specimens at failure (indicate the major and minor principal stresses on the plot). Draw the total stress Mohr-Coulomb failure envelop (i.e., the "p=0" envelop). Estimate the undrained shear strength.
Below are results from three unconsolidated undrained triaxial tests performed on a fully saturated clay specimen: Test No. 1 2 Minor principal stress (psi) Major principal stress at failure (psi) 10 25 33 22 37 45 Moisture content = 21 % Determine: a) Void ratio (e) of the soil. You may use eS = wG_ (assume Gs = 2.70) %3D b) Deviatory stress at failure for each test trial c) Shear strength parameters (cu and ø). Hint: Sketch the Mohr's circles for the three trials. 3.
Consolidated undrained triaxial tests are performed on two identical specimens of saturated, remolded clay with pore pressure measurements. The observations are recorded in the table below: Consolidation Pressure (K Pa) Cell pressure at Deviator Stress Pore Pressure at failure (K Pa) 250 350 Test No at Failure (K Pa) failure (K Pa) 105 151 1 250 180 350 250 Determine the values of the shear strength parameters, cohesion ad friction, for the clay both in terms of total and effective stresses. If in consolidation undrained test, an identical specimen is first consolidated under a cell pressure of 400 K Pa, what would be the deviator stress at failure?
Two consolidated-undrained (CU) triaxial tests are carried out on a sample of saturated overconsolidated clay. Table Q2 lists the main results at failure. 2. Table Q2: Results from CU triaxial test Minor principal total stress 03 [kPa] 30 Test No Axial load Pore water pressure [N] 450 [kPa] 10 Test 1 Test 2 60 700 20 (a) Based on the results in Table Q2, calculate the following total and effective principal stresses at failure: 01, o'1, o'3 in kPa. For the calculation, consider a constant cross-sectional area of the sample of 100 cm?. 8 mark (b) Draw the two Mohr Circles at failure and the failure envelope for Test 1 and Test 2. [10 mas (c) Compute the relevant effective strength parameters obtained from Test 1 and Test 2.
Question 2 The result presented in Table Q2a were obtained from a consolidated drained (CD) triaxial test on a normally consolidated clay sample of 75mm height x 38mm diameter tested at a confining pressure of 50 kPa. Table Q2a. CD triaxial test result Axial strain (%) 1 2 5 10 15 Applied force (kN) 0.01 0.03 0.05 0.08 0.10 Page 3 of 6 (a) Draw the Mohr circle for each stress state in the sample and the total stress path (TSP) throughout the test and determine the slope of the TSP to the horizontal.
A consolidated tri-axial test was conducted on a normally consolidated clay. The results were as follows: Chamber confining pressure = 325 kPa, Deviator stress = 423 kPa. Compute for the shear stress on the failure plane in kPa.
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‹ample 9.1: Following results were recorded from a consolidation test on a specime turated clay, each load being maintained constant for 24 hours before the addition o ext increment.