Principles of Foundation Engineering, SI Edition
9th Edition
ISBN: 9781337672085
Author: Das, Braja M., SIVAKUGAN, Nagaratnam
Publisher: Cengage Learning
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Question
Chapter 18, Problem 18.7P
a.
To determine
Find the required depth to drive a sheet pile to carry out an excavation to 4m depth.
b.
To determine
Find the maximum bending moment in the sheet pile and the required section modulus for the sheet pile section.
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Figure below shows the cross-section of an excavation which is to be made alongside a
river. Write down an expression for the effective stress at level A-A and use this to establish the depth H to
which the water in the trench can be reduced before instability occurs (when o'z is zero). The shear
resistance at the clay and sheet pile interface can be considered negligible.
sheet piling
River
peaty silt
3.5 m
dredge level
8 m
. alluvial
silty clay
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3 m
coarse
3.5 m
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impervious red marl
A vertical sheet pile supports a horizontal backfill having a height of 6 m. The backfill has a unit weight of 19 KN/m² and an angle of internal friction of 30°.
Determine the required depth of penetration.
A
3 m
B
4m
4.5 m
D
5.5 m
When a vertical face excavation was made in a
clayey silt, having density of 20 kN/m³, it failed at
a depth of excavation of 4 m. What is the cohesive
strength (in kN/m²) of the soil, if its angle of internal
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Chapter 18 Solutions
Principles of Foundation Engineering, SI Edition
Ch. 18 - Refer to Figure 18.9. A cantilever sheet pile is...Ch. 18 - Prob. 18.2PCh. 18 - Prob. 18.3PCh. 18 - Refer to Figure 18.13. Given L1 = 1.5 m, L2 = 3 m;...Ch. 18 - In Problem 18.4, find the maximum bending moment...Ch. 18 - Prob. 18.6PCh. 18 - Prob. 18.7PCh. 18 - Prob. 18.8PCh. 18 - Refer to Figure 18.23. Given L1=3m, L2=6m,...Ch. 18 - Prob. 18.10P
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- The water table at a site is at 5 m below the ground level, and it is required to excavate to this level. The soil profile consists of a thick bed of sand where the unit weight is m = 17.0 kN/m3 above the water table and sat = 20.0 kN/m3 below the water table. The friction angle of the sand is 37. The wall of the excavation will be supported by cantilever sheet piles. How deep would you drive the sheet piles? Use the simplified analysis (Figure 15.37) with a factor of safety of 1.5 on the passive resistance. Determine the maximum bending moment in the sheet pile and the required section modulus for the sheet pile section (given an allowable stress of 190 MN/m2).arrow_forwardQuestion 3 A new underground tunnel section is designed by a geotechnical consultant. For the underground station a 5 m wide braced excavation is made in a saturated clay as shown in Figure Q3 with unit weight, y = 18.5 kN/m², friction angle, o = 0° and cohesion, c = 20 kN/m?. The struts are spaced at 5 m center to center in plan. Refer Appendix 1 to select the sheet-pile section. i. Draw the strut forces. ii. Determine the section modulus of the sheet pile needed. Assume oall = 170 MN/m? iii. Determine the maximum moment for the wales at levels B and C. Show a complete answer, including all numerical values and necessary diagrams. 5 m 3 m B 2 marrow_forwardSolve as quick as possible A pit of 6.4 m deep is to be excavated in a fine sand stratum completely saturated up to the ground surface. The saturated unit weight of the sand was obtained as 20.3 kN/m³. To stabilize the bottom of the excavation (prevent boiling), it was decided to drive steel sheet piles to act as cutoff walls that encircle the excavation. Determine the total length of sheet pile wall to provide a factor of safety of 1.5 against sand boiling. Assume specific gravity of soil, G, = 2.7 and unit weight of water, Y-9.81 kN/m².arrow_forward
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