Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 12, Problem 12.5P
To determine
Find the corrected penetration number
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Following is the variation of the field standard penetration number (N60) in a sand deposit: The groundwater table is located at a depth of 6 m. Given: the dry unit weight of sand from 0 to a depth of 6 m is 18 kN/m3, and the saturated unit weight of sand for depth 6 to 12 m is 20.2 kN/m3. Use the relationship given in Eq. (3.13) to calculate the corrected penetration numbers.
Following are the results of a standard penetration test in sand. Determine the corrected
standard penetration number, (N1)60, at various depths. Note that the water table was not
observed within a depth of 10.5 m below the ground surface. Assume that the average
unit weight of sand is 17.3 kN/m3.
Depth (m) N60
1.5 8
3.0 7
4.6 12
6.0 14
7.5 13
A soil profile is shown in Figure P3.2 along with the standard penetration numbers in the clay layer. Use Eqs. (3.8) and (3.9) to determine the variation of cu and OCR with depth. What is the average value of cu and OCR?
Chapter 12 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- 9.1 Through 9.3 A soil profile consisting of three layers is shown in Figure 9.25.Calculate the values of σ, u, and σ′ at points A, B, C, and D for the following cases. Ineach case, plot the variations of σ, u, and σ′ with depth. Characteristics of layers 1, 2,and 3 for each case are given below:arrow_forwardA civil engineer is interested in assessing the variation of shear strength of clay layers in a site of interest for different depths. After completing CU triaxial tests, the sample mean for the clay shear strength 40 kPa and the standard deviation was 15.5 kPa are obtained for the depth of 3 m from ground surface. For the following conditions:a. Calculate 90% confidence interval (CI) for the population mean μ. Write down your interpretationb. Calculate 95% CI for the population mean μ. Write down your interpretationc. Calculate 99% CI for the population mean μ. Write down your interpretationd. Explain why the size of CI changed between parts a - carrow_forwardA civil engineer is interested in assessing the variation of shear strength of clay layers in a site of interest for different depths. After completing CU triaxial tests, the sample mean for the clay shear strength 40 kPa and the standard deviation was 15.5 kPa are obtained for the depth of 3 m from ground surface. For the following conditions:a. Calculate 90% confidence interval (CI) for the population mean μ. Write down your interpretationb. Calculate 95% CI for the population mean μ. Write down your interpretationarrow_forward
- 3. A civil engineer is interested in assessing the variation of shear strength of clay layers in a site of interest for different depths. After completing CU triaxial tests, the sample mean for the clay shear strength 40 kPa and the standard deviation was 15.5 kPa are obtained for the depth of 3 m from ground surface. For the following conditions: a. Calculate 90% confidence interval (CI) for the population mean μ. Write down your interpretationb. Calculate 95% CI for the population mean μ. Write down your interpretationarrow_forwardCone penetrometer soundings were used for the subsurface investigation of a planned construction site. At one sounding location, the value recorded for qc at a depth of 8 m was 8,000 kPa. The soil has a unit weight of 16 kN/m3. Using criteria that relate CPTresults and the soil angle of internal friction, estimate the value of f for the sand at the test depth.arrow_forward
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