Foundation Design: Principles and Practices (3rd Edition)

3rd Edition

ISBN: 9780133411898

Author: Donald P. Coduto, William A. Kitch, Man-chu Ronald Yeung

Publisher: PEARSON

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Textbook Question

Chapter 4, Problem 4.6QPP

A standard penetration test was performed in a 150 mm diameter boring at a depth of 9.5 m below the ground surface. The driller used a UK-style automatic trip hammer and a standard SPT sampler. The actual blow count, N, was 19. The soil is a normally consolidated fine sand with a unit weight of 18.0 kN/m 3 and D 50 = 0.4 mm . The groundwater table is at a depth of 15 m. Determine the following:

N 60
N 1 , 60
D r
Consistency (based on Table 3.3)
ϕ '

Chapter 4, Problem 4.6QPP, A standard penetration test was performed in a 150 mm diameter boring at a depth of 9.5 m below the

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Chapter 4, Problem 4.5QPP

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1. A standard penetration test was performed in a 150-mm diameter boring at a depth of 9.5 m below the ground surface. The driller used a UK-style automatic trip hammer and a standard SPT sampler. The actual blow count, N, was 19. The soil is a normally consolidated fine sand with a unit weight of 18.0 kN/m³ and D50 = 0.4 mm. The groundwater table is at a depth of 15 m. Compute the following: a. N60 b. (N₁)60 c. D, d. '

A 6 in diameter exploratory boring has been drilled through a fine sand to a depth of 19 ft. An SPT N-value of 23 was obtained at this depth using a USA safety hammer with a stan-dard sampler. The boring then continued to greater depths, eventually encountering the groundwater table at a depth of 35 ft. The unit weight of the sand is unknown. ComputeN1,60, f′, and Dr at the test location, and use this data to classify the consistency of thesand.

A standard penetration test has been conduted at a depth of 15 ft in an 8-inch diameter exploratory boring using a USA-style safety hammer and a standard sampler. This test produced an uncorrected N-value of 12. The soil inside the sampler was a fine-to-medium sand with Dsq = 0.6 mm. The vertical effective stress at this depth is 1100 lb/ft². Adjust the N- value as described in Class handout, then compute the relative density and classify the soil using Table 3.3.