Principles of Foundation Engineering (MindTap Course List)
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 3, Problem 3.16P
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Find the undrained cohesion of the clay for use in the design by using Bjerrum’s λ relationship.

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Refer to Figure P3.3. Vane shear tests were conducted in theclay layer. The vane (tapered) dimensions were 63.5 mm(d) 3 127 mm (h), iB 5 iT 5 458 (see Figure 3.23). For the test at A, the torque required to cause failure was 51 N ? m.For the clay, given: liquid limit 5 46 and plastic limit 5 21.Estimate the undrainedcohesion of the clay for use in thedesign by usingBjerrum’s l relationship
Refer to Figure P3.2. Vane shear tests were conducted in the clay layer. The vane (tapered) dimensions were 63.5 mm (d) x 127 mm (h), iB = iT = 458 (see Figure 3.23). For the test at A, the torque required to cause failure was 51 N ? m. For the clay, given: liquid limit = 46 and plastic limit = 21. Estimate the undrained cohesion of the clay for use in the design by using Bjerrum’s l relationship [Eq. (3.40a)].
SITUATION 5: A sand sample is subjected to direct shear testing at it's (in - situ) water content. Two tests are performed. For one of the tests, the sample shears at a stress of 400 kPa when the normal stress is 600 kPa. From these data, 15. Determine the value of the apparent cohesion. c. 230 kPa d. 221 kPa а. 100 kPa b. 179 КРа 16. Determine the corresponding angle of internal friction. a. 22.65 degrees b. 26.57 degrees c. 32.54 degrees d. 18.43 degrees
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