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 12.14P
To determine
Identify the soil type at each depth.
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Students have asked these similar questions
A 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
41
The 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.
What are the four different methods used to evaluate the potential for liquefaction of soil? Explain each briefly.
1. Evaluating the Liquefaction
Potential by Standard Penetration
Tests
2. Evaluating the Liquefaction
Potential by Cone Penetration
Tests
3. Evaluating the Liquefaction
Potential by Shear Wave Velocity
4. Evaluating the Liquefaction
Potential by Becker Penetration
Tests
I have given the 4 methods, just please explain this
Chapter 12 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- 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 Standard Penetration Test was performed at a depth of 15 feet in a soil with a Unit Weight of 115 lb/cubic feet. The water table was at 20 feet and the the N value was found to be 19. What is the overburden pressure at the point that the soil sample was taken? 1,000 tons/square feet 1230 lbs/square feet 575.3 lbs/square feet 0.86 tons/square feetarrow_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 21 feet was 150 ksf. The soil has a unit weight of 115 pcf. Using criteria that relate CPT results and the soil angle of internal friction, estimate the value of f for the sand at the test depth (known from borings).arrow_forward
- Define the Soil Modulus from Cone Penetration Test (modified from Mitchell and Gardner 1975) ?arrow_forward(ex A subgrade soil sample was tested using standard CBR apparatus and the observations are given below. Load (kg) 60.5 Penetration (mm) 2.5 80.5 Assuming that the load-penetration curve is convex throughout, the CBR value (%) of the sample is 5.0arrow_forwardA piezocone test was carried out at a site, and the following readings were recorded for the cone resistance q, and sleeve friction f.. Determine the soil present at these depths. Cone resistance, Sleeve friction, Depth (m) 9. (MN/m?) f. (kN/m?) 0.21 12.5 10 1.05 40.5 15 3.23 75.2 20 9.66 60.7 25 12.50 62.5arrow_forward
- What are the four different methods used to evaluate the potential for liquefaction of soil? Explain each briefly. 1. Evaluating the LiquefactionPotential by Standard PenetrationTests2. Evaluating the LiquefactionPotential by Cone PenetrationTests3. Evaluating the LiquefactionPotential by Shear Wave Velocity4. Evaluating the LiquefactionPotential by Becker PenetrationTestsarrow_forwardA collapsible soil sub-grade sample was tested using Standard California Bearing Ratio apparatus; and the observations are given below Sl. No. Load 1. 2. Penetration 60.55 kq 2.5 mm 80.55 kg 5.0 mm Taking the standard assumption (load carried by the standard specimen = 1370 kg) regarding the load penetration curve, CBR value of the sample will be taken asarrow_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 undertain 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 stress ratio, CSR. Express your…arrow_forward
- A 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 undertain 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_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_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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