In a standard penetration test in sands, the blow count measured at 14 m depth was 26. An automatic hammer released by a trip with an efficiency of 70% was used in the test. The unit weight of sand is 17.5 kN/m³. Determine: (a) N60 (N1)60 using Peck, Hanson, and Thornburn (1974) correlation with Pa = 100 kPa. The most likely value of the friction angle (not the range). The possible range of relative density per Peck et al. (1974) The Young's Modulus. The table below presents two correlations proposed for estimating Young's Modulus. kg Leonards (1986) = 8N60 E (kPa) = aPa (kPa)N60 Kulhawy & Mayne (1990)
In a standard penetration test in sands, the blow count measured at 14 m depth was 26. An automatic hammer released by a trip with an efficiency of 70% was used in the test. The unit weight of sand is 17.5 kN/m³. Determine: (a) N60 (N1)60 using Peck, Hanson, and Thornburn (1974) correlation with Pa = 100 kPa. The most likely value of the friction angle (not the range). The possible range of relative density per Peck et al. (1974) The Young's Modulus. The table below presents two correlations proposed for estimating Young's Modulus. kg Leonards (1986) = 8N60 E (kPa) = aPa (kPa)N60 Kulhawy & Mayne (1990)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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![In a standard penetration test in sands, the blow count measured at 14 m depth was 26. An automatic hammer released by a trip with an efficiency of 70% was used in the test. The unit weight of sand is 17.5 kN/m³. Determine:
(a) N₆₀
(b) (N₁)₆₀ using Peck, Hanson, and Thornburn (1974) correlation with Pₐ = 100 kPa.
(c) The most likely value of the friction angle (not the range).
(d) The possible range of relative density per Peck et al. (1974)
(e) The Young’s Modulus.
The table below presents two correlations proposed for estimating Young’s Modulus.
\[
\begin{array}{|c|c|}
\hline
E \left( \frac{kg}{cm²} \right) = 8N₆₀ & \text{Leonards (1986)} \\
\hline
E (kPa) = \alpha Pₐ (kPa) N₆₀ & \text{Kulhawy \& Mayne (1990)} \\
\hline
\end{array}
\]
In the table, α = 5 for fine sands, 10 for clean normally consolidated sands, and 15 for clean over consolidated sands.
If a specific method is not specified, you may use any possible correlations. While doing so, you must clearly indicate which correlation was used.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0c91e8d4-c182-4876-82b1-3c6b4fa1f835%2F87fa570d-637f-4919-a0a0-3b2af92f0fdd%2Fc192qr_processed.png&w=3840&q=75)
Transcribed Image Text:In a standard penetration test in sands, the blow count measured at 14 m depth was 26. An automatic hammer released by a trip with an efficiency of 70% was used in the test. The unit weight of sand is 17.5 kN/m³. Determine:
(a) N₆₀
(b) (N₁)₆₀ using Peck, Hanson, and Thornburn (1974) correlation with Pₐ = 100 kPa.
(c) The most likely value of the friction angle (not the range).
(d) The possible range of relative density per Peck et al. (1974)
(e) The Young’s Modulus.
The table below presents two correlations proposed for estimating Young’s Modulus.
\[
\begin{array}{|c|c|}
\hline
E \left( \frac{kg}{cm²} \right) = 8N₆₀ & \text{Leonards (1986)} \\
\hline
E (kPa) = \alpha Pₐ (kPa) N₆₀ & \text{Kulhawy \& Mayne (1990)} \\
\hline
\end{array}
\]
In the table, α = 5 for fine sands, 10 for clean normally consolidated sands, and 15 for clean over consolidated sands.
If a specific method is not specified, you may use any possible correlations. While doing so, you must clearly indicate which correlation was used.
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