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 2.22P
To determine
Find the number of steel plates stacked before the specimen fails.
Find the consistency term for the clay.
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a）For clays, the failure line (one that connects the peak failure stresses) in the normally consolidated range does not have a cohesion intercept, whereas the failure line in the overconsolidated range has a cohesion intercept.
T or F
B）During the shearing phase of a CU test, the void ratio of a NC consolidated clay specimen will:
1 decrease.
2 could increase or decrease.
3 remain a constant.
4 increase.
C)What does the cohesion (that appears in the Mohr-Coulomb criterion) of OC clays depend on?
1the preconsolidation pressure.
2whether the failure stresses are total or effective.
3the soil type.
4everything listed here.
4. 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.
Two drained triaxial tests were performed on a saturated overconsolidated clay
and the results are shown below. Determine the effective and total shear
strength parameters.
Specimen I:
Specimen II:
0²-70 kPa
a=160 kPa
Od 130 kPa
Od-223.5 kPa
Chapter 2 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- A 75 mm diameter clay specimen was consolidated in an oedometer under 200 kPa. At the end of consolidation, the void ratio is 0.863 and the specimen thickness is 18.51 mm. When the stress increment of 200 was added to the current vertical stress of 200 kPa, the specimen consolidated to a thickness of 17.56 mm. Assuming that the clay was normally consolidated under the vertical stress of 200 kPa, find the a) coefficient of volume compressibility in (MPa)^-1 and rounded to the 3rd decimal place.b) and the compression index of the clay rounded to the 2nd decimal place.arrow_forward2. A layer of compressible clay 6m thick overlies an impervious bedrock and carries an overburden of pervious sand. A large structure founded in the sand causes the stress on every horizontal section of the clay to increase to the same value. In a standard laboratory oedometer consolidation test performed on a 19 mm thick clay specimen, the void ratio changed from 0.765 to 0.750 under a corresponding increase in stress. Consolidation was 70% complete after 30 min. In the field, a) Estimate the settlement of the structure. b) Determine the time taken for one half of the consolidation settlement to take place (Remember the lab test is for a doubly drained specimen.). c) Determine how long it takes for 50% of the settlement to take place at a depth of 0, 2, 3, 5 and 6 m of the clay stratum. d) If the clay were underlain by pervious sand, determine how long it takes for 50% of the settlement to take place at a depth of 0, 2, 3, 5 and 6 m of the clay stratum.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
- A sample of ocean sand was retrieved from 7 m below the surface. The sample had been under a vertical stress Ov of 150 kN/m³, a horizontal stress Oh of 250 kN/m³, a shear stress of 86.6 kN/m. If the angle theta between the vertical stress and the principal stress is 60°, calculate the angle of internal friction of the soil. [Hint: you must sketch the Mohr circle of stresses] Please explain clearly and step by steparrow_forwardA standard oedometer test in the laboratory indicated that a 0.02 m thick clay specimen took 0.5 days to undergo 90% primary consolidation. How many days will a 2 m thick layer of identical clay sandwiched between sand layers and subjected to an identical stress increment take to undergo the same?arrow_forwardQuestion 10 A clay specimen was tested in undrained direct shear, under a normal stress of 50 kPa. The peak shear stress measured was 32 kPa and the critical state shear stress measured was 22 kPa. What is the critical state undrained strength of the clay specimen? Express your answer in kPa, but write only the numeric answer in the text boxarrow_forward
- Steel plates with mass of 1500 g each were stacked on topof a 75 mm diameter and 150 mm high clay specimen,as shown in Figure P2.22 (attached). If the undrained shear strengthof the specimen is 45.0 kN/m2, how many plates can bestacked before the specimen fails? What is the consistencyterm for this clay?arrow_forwardA consolidated undrained triaxial test was performed on a normally consolidated clay with a critical state friction angle of 230. After an initial isotropic consolidation at a cell pressure of 50 kPa, drainage was turned off, the cell pressure was increased to 85 kPa, and the sample was loaded to ultimate conditions. A pore pressure of 55 kPa was measured at ultimate state. What value of major principal total stress was measured at the ultimate state?arrow_forwardData 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 kPaarrow_forward
- A sample of clean sand was retrieved from 7 m below the surface. The sample had been under a vertical load of 150 kN/m², a horizontal load of 250 kN/m², and a shear stress of 86.6 kN/m². If the angle between the vertical stress and the principal stress is 60°, what is the angle of internal friction of this sample?arrow_forwardIn an Oedometer apparatus, a specimen of fully saturated clay has been consolidated under a vertical pressure of 50 kN/m2 and is presently at equilibrium. The effective stress and pore water pressure immediately on increasing the vertical stress to 150 kN/m2, respectively are...?arrow_forwardQuestion 4.12 A cube of reservoir rock with sides of 2.5 ft has a single vertical fracture of width 0.35 that passes completely through the rock. The matrix permeability is 1 mD. a) What is the permeability of the fracture (in D)? b) What is the average permeability of the cube if the flow is in the direction parallel to the fracture (in mD)? c) What is the average permeability of the cube if the flow is in the direction normal to the fracture (in mD)?arrow_forward
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