Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 2, Problem 2.21P
To determine
Sketch the three Mohr circles and draw the failure envelope in terms of effective stresses and also find the shear strength parameters
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3. In a drained tri-axial test, a specimen is confined under pressure and axially loaded until failure.
The failure conditions of the specimen are analyzed for shear strength. What is the value of the
minor principle stress?
Half the value of the major principle stress
Twice the value of the major principle stress
. The same as the confining pressure
The same as the cohesion value
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Triaxial tests performed on samples of aeolin sand. The failure conditions in terms of effective
stress are (ov, 0h) = (515, 100), (1250, 200), (3500, 400), and (5325, 800) kPa. Using (s, t)
space, determine the cohesion and friction angle. What is the orientation of the major principal
stress with respect to the failure plane? Determine this graphically.
4. Please answer parts a and b
Chapter 2 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- At failure, the major and minor principal stresses on a triaxial test are 200 kPa and 110 kPa respectively. If the porewater pressure at failure is 25 kPa... Q: What is the sine of the angle of shearing resistance of the soil? Round off your answer to two decimal places.arrow_forward2. A series of consolidated, undrained triaxial tests were carried out on specimens of a saturated clay under no backpressure. The test data at failure are summarized: Confining Pressure (kPa) Deviator Stress (kPa) Pore Water Pressure (kPa) 150 192 80 300 341 154 450 504 222 a. Draw the Mohr circles and find the cohesion and friction angles in terms of effective stresses. b. Compute Skempton’s A-parameter at failure for all three specimens. c. Is the soil normally consolidated or overconsolidated? Why? d. Another specimen of the same clay that was consolidated under a cell pressure of 250 kPa was subjected to a consolidated, drained triaxial test. What would be the deviator stress at failure?arrow_forwardplease Show complete solution and avoid rounding off intermediate values. Please write legibly. Athanksarrow_forward
- Determine the fracture pressure at 3,000 ft for Gulf Coast using Hubbert & Willis, Matthews & Kelly and Eaton's methods. The available data for this formation is given as %=0.41 K=0.000085 A-¹ Pg=2.6 P=1.074 Fa=0.45 hand written plz μ=0.36arrow_forwardA specimen is subjected to a tri-axial test. The soil specimen is cohesionless. If the shear stress that cause failure is 3oo kPa and the normal stress at failure is only 475 kPa. 1. Determine the angle of shearing resistance. 2.Determine the angle that the failure plane measured from the major principal plane 3.Determine the maximum principal stress at which failure is expected to occurarrow_forwardKindly answer all. If you can't answer all please leave it. Thank youarrow_forward
- 8. A cohesionless (c' = 0 kPa) soil specimen was subjected to a consolidated-undrained triaxial test. The total stress path, the deviator stress, and the pwp are shown in the figures below. No scale is intended in the figure of the stress path. a. Determine o'₁ and 0's at failure. [o'₁ = 345 kPa, o's= 140 kPa] b. Determine the effective friction angle (') of the soil. [$' = 25°] C. Determine the 'A' pore water pressure parameter at failure. [A+ = 0.29] 250 -Deviator Stress q (kPa), 200 150 100 50 200 p (kPa) Deviator stress or PW/P (kPa) 5 10 Vertical strain (%) ---PWP 15 20arrow_forward4. The uniaxial compressive strength test is done on a cylindrical rock specimen with diameter of 60 mm and length of 120 mm. The load- deformation diagram of this specimen is shown on the following figure. Determine the uniaxial compressive strength and the secant Young modulus (E50) of this rock. 80000 70000 60000 50000 40000 30000 20000 10000 0.5 1 1.5 Deformation (mm) Load (N) 2.arrow_forwardCan TRIAXIAL TESTS be performed on sand samples? Briefly explain. The results of an undrained triaxial test on a clay soil sample are given in table below Cell Pressure (kN/m2) 200 400 600 Additional Axial Load at Failure (N) 342 388 465 Each sample, originally 76mm long and 38mm in diameter, experienced a vertical deformation of 5.1mm. Evaluate the stress at failure for each cell pressure given in table above. Draw Mohr Circles and determine the shear strength parameters of the soil.arrow_forward
- I need the answer as soon as possiblearrow_forward3. The following table shows the shear test results along the foliation surfaces of gneisses. The area of the discontinuity surface is 6.4*10-3 m2. a) Fill in the table b) Calculate the slip resistance parameters of the gnaysa ). (use millimeter paper) Experiment No. Shearing Normal Load Shearing Normal burden Tensile Stress (kg) (kg) (kg/cm2) (kg /cm? 1 750 500 1400 1200 3 1600 1400 4 2000 1800 2500 3500 6. 3000 4250arrow_forwardA 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.arrow_forward
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