Midterm #2.pdf

# Midterm #2.pdf - CEE 452/598 Summer 2017 Midterm#2 Name...

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Name: Possible Points: 100. Points Earned: . 1 CEE 452/598 Summer 2017 Midterm #2 1. The following information was collected during a geotechnical evaluation for a subject property. The idealized soil profile for the subject property is provided in the table below. Calculate the stress at the layer interfaces. Assume the soil has a specific gravity of 2.70. The soils encountered in borings were classified as SM or SC soils.(+25 Points) Depth Below Grade (ft) Saturation (%) γ dry (lb/ft 3 ) N field (blows/ft) φ (degrees) 0.0 - 2.5 38% 90.0 15 28 2.5 - 5.0 45% 91.7 14 28 5.0 - 7.5 33% 99.4 19 31 7.5 - 10.0 31% 96.0 21 31 10.0 - 15.0 43% 96.5 34 33 15.0 - 20.0 59% 108.1 33 33 20.0 - 30.0 48% 101.8 41 36 30.0 - 40.0 50% 102.8 43 36 40.0 - 50.0 45% 106.4 47 36 50.0 - 60.0 46% 106.0 44 36 60.0 - 70.0 56% 102.7 35 33 Determine the following for the information provided: a. Vertical effective stress with depth, b. Active lateral earth pressure with depth, c. At-rest lateral earth pressure with depth, d. Passive lateral earth pressure with depth, e. N 60 at the midpoint of the layers (i.e, L = 1.25, 3.75, …)

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