2. Design the anchored sheet pile wall supporting a loose sand fill as shown in the following Figure. GWT is at the same height on both sides, and assume yw=10kN/m³. Based on the log spiral solutions, the K, for the loose sand is 0.3 while the K₂ and Kp for the dense sand are 0.2 and 13.125, respectively. Using the free earth support method, do the following: a) For a factor of safety of 2 on the passive resistance, determine the required depth of penetration depth, D. (initial trial with D'=1.5m) b) Determine the bending moment and the anchor load. c) Select a sheet pile section from the Table 9.1 (E-210x10³ MN/m² and fa-210 MN/m²)

2. Design the anchored sheet pile wall supporting a loose sand fill as shown in the following Figure. GWT is at the same height on both sides, and assume yw=10kN/m³. Based on the log spiral solutions, the K, for the loose sand is 0.3 while the K₂ and Kp for the dense sand are 0.2 and 13.125, respectively. Using the free earth support method, do the following: a) For a factor of safety of 2 on the passive resistance, determine the required depth of penetration depth, D. (initial trial with D'=1.5m) b) Determine the bending moment and the anchor load. c) Select a sheet pile section from the Table 9.1 (E-210x10³ MN/m² and fa-210 MN/m²)

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter14: Sheet-pile Walls

Section: Chapter Questions

Problem 14.8P

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Concept explainers

Braced cuts

The braced cut is a method of providing lateral support to the soil in foundation trenches, to prevent the trenches from deformation by the caving in of soil and resisting it from moving laterally. During shallow excavation in firm soil, generally, slopes are provided to resist the caving in of soil. During shallow excavation in soft soil and deep excavation, the chances of caving in of soil increase. Hence, it becomes necessary to make a provision to resist the deformation of trenches due to caving in of soil. The braced cut is the method used for such conditions. The excavation using braced cuts is a bit uneconomical as compared to the traditional open-cut excavation method but provides better safety than the cut excavation method.

Question

2. Design the anchored sheet pile wall supporting a loose sand fill as shown in the
following Figure. GWT is at the same height on both sides, and assume yw=10kN/m³.
Based on the log spiral solutions, the K₂ for the loose sand is 0.3 while the K₂ and Kp
for the dense sand are 0.2 and 13.125, respectively. Using the free earth support
method, do the following:
a) For a factor of safety of 2 on the passive resistance, determine the required depth of
penetration depth, D. (initial trial with D'=1.5m)
b) Determine the bending moment and the anchor load.
c) Select a sheet pile section from the Table 9.1 (E-210x10³ MN/m² and far-210 MN/m²)
3. Re-design the wall using the fixed earth support method and comment on the
different results from the two methods.
7.0m.
D
Yt = 16.5 kN/m³
$' = 30°
Loose sand fill:
Yt = 19.5 kN/m3
' = 30°
Dense sand:
Yt = 21 kN/m³
$' = 40°
↓q=10
1.5m.
0.5m.
kN/m²

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Step 4: Calculate distance of P from E

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Step 5: Calculate penetration depth

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