Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Question
Chapter 19, Problem 19.2P
a.
To determine
Find the strut load.
b.
To determine
Find the required section modulus for sheet pile section.
c.
To determine
Find the maximum moment for the two wales.
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Properties of soil and concrete
4m
O = 30°
Cohesion =0
Coefficient of base friction = 0. 50
Soil's ultimiate bearing capacity= 425 kNm
deoncrete = 23.6 kN /m?
Use Ronkine's theory considering no evoson
and future excavation would happen in the
Soil.
%3D
12 D.
%3D
a) Determine the location of the active force from the base.
b) Determine the total noirmal force reaction of soil at the boser
c) Determine FS SLIDING .
d) Determine FSauturning o
e) Determine FSpering.
A long trench is excavated in medium dense
sand for the foundation of a multistory building.
The side of the trench are supported with sheet
piles fixed in place by struts and wales as
shown in the figure. Wales are braced at every
4m center to center. Determine the structs from
A-C.
1.5ml
Sand
2.5m
y = 17kN/m³
-
= 35°
8m
2.5m
1.5m
A
B
C
Question 2
Refer to the braced cut shown in Figure Q2, for which y = 17.6 kN/m², 6' = 32°, and c’ = 0.
The struts are located 4 m on center-to-center in the plan. Draw the earth-pressure envelope and
determine the strut loads at levels A, B, and C.
Determine also:
a. The sheet-pile section modulus, assume that Gan =170 x 10³ kN/m?
b. The required section modulus of the wales at level A; assume that Gan = 173 x 10º kN/m²
-5 m-
2 m
A
3 m
В
c = 0
3 m
C
1 m
Chapter 19 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- The cross section of a braced cut supporting a sheet pile installation in a clay soil is shown in Figure 14.22. Given: H = 12 m, clay = 17.9 kN/m3, = 0, c = 75 kN/m2, and the center-to-center spacing of struts in plan view, s = 3 m. a. Using Pecks empirical pressure diagrams, draw the earth-pressure envelope. b. Determine the strut loads at levels A, B, and C.arrow_forwardA braced cut shown in Figure P19.3 is to be made to a depth of 9.0 m in a saturated clay deposit where the unit weight is 17.65 kN/m3 and the undrained shear strength is 30 kN/m2. The struts are spaced horizontally at 3.0 m center to center. Find the strut loads.arrow_forwardA 5 m wide braced excavation is made in a saturated clay, as shown in Figure P19.1, with the following properties: c = 20 kN/m2, = 0, and = 18.5 kN/m3. The struts are spaced at 5 m center to center in plan. a. Determine the strut forces. b. Determine the section modulus of the sheet pile required, assuming all = 170 MN/m2. c. Determine the maximum moment for the wales at levels B and C.arrow_forward
- Situation 9: An 8m deep braced cuts in medium clay is shown. The unit weight = 16.5 kN/m3 and the undrained shear strength Cu = 27.8 kPa. In the plan, the struts are placed at spacing 2.4m center to center. Using Peck's Empirical pressure diagram: m 0.25H 2m В H= 8 m 0.75 H 2|m 2|m Pa = yh - 4Cu %3D 41. Compute the actual load on strut A. A. 124.57 kN C. 116.47 kN B. 153.48 kN D. 162.81 kN 42. Compute the actual load on strut B. А. 33.29 kN C. 28.42 kN B. 40.54 kN D. 35.29 kN 43. Compute the actual load on strut C. A. 127.92 kN C. 131.95 kN B. 210.38 kN D. 199.68 kNarrow_forwardAn excavation in soft clay is supported by a braced sheet pile wall. Calculate the force in strut A. O a. 631.92 kN O b. 151.67 kN O c. 203.53 kN O d. 430.87 kN Struts are spaced 2.5 m centre to centre Soft clay %=17kN/m³ S20 kPa $=0° max=yH = YH (1-4) H Q|25Harrow_forwardRefer to the braced cut shown below. Given: unit weight = 17 kN/m3, Friction angle = 35degrees, and c = 0. The struts are located at 3 m center-to-center in the plan. a. Draw the earth-pressure envelope and determine the strut loads at levels A, B, and C. b. Determine the sheet-pile section modulus c. Determine the section modulus of the wales at level B Assume that = 170 MN/m2.arrow_forward
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