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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Define the Soil Modulus from Cone Penetration Test (modified from Mitchell and Gardner 1975) ?
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.
For determining subsurface soil conditions compare between the static cone penetrometer and standard penetration test methods.
Chapter 12 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- 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 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?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
- Cone 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_forwardThe figure below shows a proposed site where an excavation will be made. The 12 ft layer of sand will be removed, so that the top of the 30 ft normally consolidated clay layer will be exposed (Assume that changes in GWT do not affect γt of clay). a. Assume that the water-table location remains the same during excavation. Compute the σ, σ′v, and u values at the middle of the clay layer before and after the excavation b. Assuming 1-D conditions, compute how much the clay layer will deform due to this excavation, in inches. Specify whether this is settlement or heavearrow_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
- FUNDAMENTALS OF GEOTECHNICAL ANALYSIS During a Standard Penetration Test on silty clay soil, blow counts of 7, 11 & 16 were recorded for the 1st, 2nd, and 3rd, with 6-inch intervals of an 18-inch split spoon. a) What is the N value? and, b) What is the consistency of the soil?arrow_forwardPlease solve from the given soil profile Thank youarrow_forwardWhat 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 thisarrow_forward
- The results of a three consolidated undrained tri-axial test on saturated clay are as follows: Compute the angle of internal friction a. 15.03 degreesb. 12.06 degreesc. 18.40 degreesd. 31.05 degreesarrow_forwardExplain the Soil Modulus from Standard Penetration Resistance (modified from Mitchell and Gardner 1975) ?arrow_forwardMake a comparison between the static cone penetrometer and standard penetration test methods for determining subsurface soil conditions.arrow_forward
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