A cantilever sheet pile wall is required to support a temporary excavation, as shown in the accompanying Figure. Using the available information, determine the depth of penetration of the wall into the stiff clay layer, and the anchor force per unit length of the wall (i.e. normal to the plane of the Figure). Assume the soil above the ground surface to be fully saturated. In carrying out your calculations, consider two different approaches: (A) Apply a factor of safety FS on the overall passive resistance, which is usually taken at around 1.5 while using the nominal values for the strength parameters shown in the Figure. (B) Apply a mobilization factor F, to the friction angle so that the design value is obtained from the nominal value as o'design = 9'er / F, where the mobilization factor is about 1.5. Likewise, in the second method the design undrained shear strength is obtained from the corresponding nominal value as (Su), design = Su / Fu where the mobilization factor Fu is about 1.75. Compare the results between the two approaches. Also, discuss the most critical loading condition i.e., undrained (short- term) conditions using total stresses andc = Su , 9 = 0, or drained (long term) %3D
A cantilever sheet pile wall is required to support a temporary excavation, as shown in the accompanying Figure. Using the available information, determine the depth of penetration of the wall into the stiff clay layer, and the anchor force per unit length of the wall (i.e. normal to the plane of the Figure). Assume the soil above the ground surface to be fully saturated. In carrying out your calculations, consider two different approaches: (A) Apply a factor of safety FS on the overall passive resistance, which is usually taken at around 1.5 while using the nominal values for the strength parameters shown in the Figure. (B) Apply a mobilization factor F, to the friction angle so that the design value is obtained from the nominal value as o'design = 9'er / F, where the mobilization factor is about 1.5. Likewise, in the second method the design undrained shear strength is obtained from the corresponding nominal value as (Su), design = Su / Fu where the mobilization factor Fu is about 1.75. Compare the results between the two approaches. Also, discuss the most critical loading condition i.e., undrained (short- term) conditions using total stresses andc = Su , 9 = 0, or drained (long term) %3D
Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN:9781337705028
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter18: Sheet-pile Walls
Section: Chapter Questions
Problem 18.2P
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