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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Chapter 8, Problem 8.11QPP
A proposed office building will include an 8 ft6 in square, 3 ft deep spread footing that will support a vertical downward service load of 160 k. The soil below this footing is an overconsolidated clay with the following engineering properties:
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A gravity retaining wall is shown in the figure below. Calculate the factor of safety with respect to overturning and sliding, given the following data:
Wall dimensions: H = 6 m, x1 = 0.6 m, x2 = 2 m, x3 = 2m,
x4 0.5 m, x5 = 0.75 m, x6 = 0.8 m, D= 1.5 m
Soil properties: 71 = 15.5 kN/m³, ₁ = 32°, Y2 = 18 kN/m³,
2=22°, c₂ = 40 kN/m²
H
x6
X2 TXT
X3
Use Coulomb's active earth pressure in your calculation and let ' = 2/3 01. Use Yconcrete = 23.58 kN/m³. Also, use k₁ = k₂ = 2/3 and P = 0 in equation
FS (sliding)
(ΣV) tan(k₁₂2) + Bk2c + Pp
Pa cos a
For 1 = 32°, a = 0°, B = 71.57°, Ka = 0.45, 8' = 21.33°.
(Enter your answers to three significant figures.)
FS (overturning)
FS (sliding)
=
For the cantilever retaining wall shown in the figure below, let the following data be given:
Wall dimensions: H = 6.5 m, x1 = 0.3 m, x2 = 0.6 m, x3 = 0.8 m,
x4 2 m, x5 = 0.8 m, D= 1.5 m, a = 0°
Soil properties: 71 = 17.08 kN/m³, ₁ = 36°, Y2 = 19.65 kN/m³,
2 = 15°, c₂ = 30 kN/m²
For 2=15°: N = 10.98; N₁ = 3.94; N₁ = 2.65.
x2
..
c₁ = 0
Φί
H
x5
Calculate the factor of safety with respect to overturning, sliding, and bearing capacity. Use Yconcrete = 24.58 kN/m³. Also, use k₁ = k2 = 2/3 and P₂ = 0 in equation
(EV) tan(k102) + Bk2c₂ + Pp
FS (sliding)
Pa cos a
(Enter your answers to three significant figures.)
FS (overturning)
FS (sliding)
FS (bearing)
=
=
=
A) # of Disinfection Clearwells: 3
B) Clearwell Operation Style: Parallel (to provide contact time for disinfection
using free chlorine (derived from a hypochlorite solution generated onsite).
C) The facility's existing system to generate hypochlorite onsite has reached
the end of its useful life, and the current operating capacity is insufficient
to generate the required mass flow of hypochlorite to accommodate the
future capacity of 34.5 MGD. Assume the facility plans to stop generating
hypochlorite onsite and will instead purchase a bulk solution of sodium
hypochlorite
D) Sodium hypochlorite (NaOCI) concentration: 6.25% NaOCI by mass
E) Bulk Density: 1,100 kg/m^3
F) Clearwell T10/DT Ratio: (CW1 0.43). (CW2 = 0.51), (CW3 = 0.58)
DT is the theoretical mean hydraulic retention time (V/Q)
G) pH: 7.0
H) Design Temperature: 15°C
1) 50% of Chlorine is lost in each clearwell
J) If the concentration going into the clearwell is C, then you can assume that
the concentration leaving the…
Chapter 8 Solutions
Foundation Design: Principles and Practices (3rd Edition)
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