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
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- Consistency (based on Table 3.3)
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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.
Chapter 4 Solutions
Foundation Design: Principles and Practices (3rd Edition)
Ch. 4 - Describe a scenario that would require a very...Ch. 4 - How would you go about determining the location of...Ch. 4 - A five-story office building is to be built on a...Ch. 4 - A two-story reinforced concrete building is to be...Ch. 4 - Discuss the advantages of the CPT over the...Ch. 4 - A standard penetration test was performed in a 150...Ch. 4 - Using the CPT data in Figure 4.22, a unit weight...Ch. 4 - Prob. 4.8QPPCh. 4 - Prob. 4.9QPPCh. 4 - A series of vane shear tests have been performed...
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Similar questions
- Q2/A standard penetration test was performed in a 150 mm diameter borehole at a depth of 9.5 m below the ground surface. The driller used a UK-style automatic trip hammer, a standard SPT sampler and a 10-m drill rod. The blow counts obtained in the field were as follows: 0-150mm = 4 blows: 150-300mm = 7 blows; 300-450mm = 12 blows. The soil is normally consolidated fine sand with a unit weight of 18.0 kN/m³ and D50 = 0.4 mm. The ground water table is at a depth of 15 m. Compute: (a) N60, (b) (N1)60, (c) D.%, (d) , and (e) denseness of the fine sand.arrow_forwardA standard penetration test was conducted at a site 12 m below the earth's surface. The observed SPT number was 26. The water table is at the ground surface, the soil investigation shows specific gravity of solids to be 2.65 and void ratio to be 0.60. The final SPT number is? A B D 20 23 31 41arrow_forwardsand deposit has been identified beneath a site located adjacent to a river. The sand deposit is 15 feet thick and the top of the layer is 12 feet below the ground surface and overlain by a very stiff clay and is underlain by bedrock. The water level has been measured to be at a depth of 10 feet. The standard penetration resistance of the layer has been determined to be 12 blows per foot and a standard sampler was used; a drill rig with a safety hammer with an efficiency of 60% was used. The length of the drill rod is 10 meters and the borehole diameter is 5 inches (127 mm). The design earthquake has been designated as a moment magnitude 6-3/4 event on a nearby fault and the maximum ground acceleration is expected to be 0.40 g. The wet unit weight of the clay soils is 150 pounds per cubic foot and the wet unit weight of the sand soils is 180 pounds per cubic foot. The sands have 35% fines content according to a grain size analysis. Compute the factor of safety against liquefaction of…arrow_forward
- Problem 2: A standard penetration test has been conducted on a coarse sand at a depth of 16 ft below the surface. The blow counts obtained in the field were as follows: 0-6 in. (4 blows), 6-12 in. (6 blows), and 12-18 in. (6 blows). The tests were conducted using a USA-style donut hammer in a 6 in. diameter boring using a standard sampler with the liner installed. The vertical effective stress at the test depth was 1500 lb.ft?. Determine N160.arrow_forwardA standard penetration test is carried out in sand where the efficiency of the hammer nH =70%. If the measured N-value at 30 ft depth is 24, find N60 and (N1)60. The unit weight of the sand is 115.0 lb/ft3. Assume nB = nS = nR =1.arrow_forwardThe following standard penetration test results were obtained in a uniform silty sand:Depth (m) 1 2 3 5N60 12 13 18 15 The groundwater table is at a depth of 2.5 m. Assume a reasonable value for g, then determinef′ for each test. Finally, determine a single design f′ value for this stratum.arrow_forward
- A sand deposit has been identified beneath a site located adjacent to a river. The sand deposit is 30 feet thick and the top of the layer is 24 feet below the ground surface and overlain by a very stiff clay and is underlain by bedrock. The water level has been measured to be at a depth of 30 feet. The standard penetration resistance of the layer has been determined to be 20 blows per foot and a sampler without liners was used; a drill rig with a safety hammer with an efficiency of 60% was used. The length of the drill rod is 5 meters and the borehole diameter is 7.87 inches (200 mm). The design earthquake has been designated as a moment magnitude 7.5 event on a nearby fault and the maximum ground acceleration is expected to be 0.60 g. The wet unit weight of the clay soils is 200 pounds per cubic foot and the wet unit weight of the sand soils is 250 pounds per cubic foot. The sands have 45% fines content according to a grain size analysis. Determine the magnitude scaling factor, MSF.…arrow_forwardA piezocone test was carried out at a site, and the following readings were recorded for the cone resistance qc and sleeve friction fs. Determine the soil present at these depths. Cone resistance, qc (MN/m2) 0.21 1.05 3.23 9.66 10 (b) What are the types of bearing capacity failures? Compare between them? (c) Numerate the types of drilling methods? Depth (m) 5 10 15 20 22 Sleeve friction, fs (kN/m2) 12.5 40.5 75.2 60.7 80arrow_forwardA sand deposit has been identified beneath a site located adjacent to a river. The sand deposit is 15 feet thick and the top of the layer is 12 feet below the ground surface and overlain by a very stiff clay and is underlain by bedrock. The water level has been measured to be at a depth of 10 feet. The standard penetration resistance of the layer has been determined to be 12 blows per foot and a standard sampler was used; a drill rig with a safety hammer with an efficiency of 60% was used. The length of the drill rod is 10 meters and the borehole diameter is 5 inches (127 mm). The design earthquake has been designated as a moment magnitude 6-3/4 event on a nearby fault and the maximum ground acceleration is expected to be 0.40 g. The wet unit weight of the clay soils is 150 pounds per cubic foot and the wet unit weight of the sand soils is 180 pounds per cubic foot. The sands have 35% fines content according to a grain size analysis. Determine the cyclic resistance ratio, CRR. Use this…arrow_forward
- A standard penetration test has been conducted on a coarse sand at a depth of 16 ft below the surface. The blow counts obtained in the field were as follows: 0-6 in. (4 blows), 6- 12 in. (6 blows), and 12-18 in. (6 blows). The tests were conducted using a USA-style donut hammer in a 6 in. diameter boring using a standard sampler with the liner installed. The vertical effective stress at the test depth was 1500 lb.ft'. Determine N1.arrow_forwardAn SPT test was conducted in a dry sand (no ground water table) with a unit weight of 18kN/m3. The drill rig used had an energy efficiency rating of 60%. The recorded blow counts were 6, 7 and 8. The depth of testing was 6 m. Use the Liao and Whitman (1986) correction for overburden stress to determine the corrected SPT value at this depth. N60=? CN=? (use 3 decimals) N1(60)=? (truncated to an integer value)arrow_forwardA sand deposit has been identified beneath a site located adjacent to a river. The sand deposit is 15 feet thick and the top of the layer is 12 feet below the ground surface and overlain by a very stiff clay and is underlain by bedrock. The water level has been measured to be at a depth of 10 feet. The standard penetration resistance of the layer has been determined to be 12 blows per foot and a standard sampler was used; a drill rig with a safety hammer with an efficiency of 60% was used. The length of the drill rod is 10 meters and the borehole diameter is 5 inches (127 mm). The design earthquake has been designated as a moment magnitude 6-3/4 event on a nearby fault and the maximum ground acceleration is expected to be 0.40 g. The wet unit weight of the clay soils is 150 pounds per cubic foot and the wet unit weight of the sand soils is 180 pounds per cubic foot. The sands have 35% fines content according to a grain size analysis. Determine the magnitude scaling factor, MSF. Express…arrow_forward
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