15 A slope 60 ft high has a face inclination of 30°. Uniform soils comprise the slope and foundation zone and have a unit weight of 115 pcf, an angle

Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN:9781305970939
Author:Braja M. Das, Khaled Sobhan
Publisher:Braja M. Das, Khaled Sobhan
Chapter17: Subsoil Exploration
Section: Chapter Questions
Problem 17.13P
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Solve a and b
15 A slope 60 ft high has a face inclination of 30°.
Uniform soils comprise the slope and foundation
zone and have a unit weight of 115 pcf, an angle
of internal friction of 25°, and a cohesion of 400
psf. Use the Taylor stability charts for total
stress analysis to:
(a) Determine the slope factor of safety in
regard to soil cohesion only.
(b) Determine the slope factor of safety in re-
gard to both cohesion and angle of internal
friction. (Hint: Use a trial-and-error proce-
dure by assuming a value for the FS to
apply to o, obtain a value for N, then
compare the assumed FS with the formula-
calculated FS.)
Transcribed Image Text:15 A slope 60 ft high has a face inclination of 30°. Uniform soils comprise the slope and foundation zone and have a unit weight of 115 pcf, an angle of internal friction of 25°, and a cohesion of 400 psf. Use the Taylor stability charts for total stress analysis to: (a) Determine the slope factor of safety in regard to soil cohesion only. (b) Determine the slope factor of safety in re- gard to both cohesion and angle of internal friction. (Hint: Use a trial-and-error proce- dure by assuming a value for the FS to apply to o, obtain a value for N, then compare the assumed FS with the formula- calculated FS.)
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