Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 18, Problem 18.17P
To determine
Find the ultimate holding capacity of the anchor in sand.
Find the anchor displacement.
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It is required to design a cantilever retaining wall to retain a 5.0 m high sandy backfill. The dimensions of the cantilever wall are shown in Figure 15.52 along with the soil properties. Check the stability with respect to sliding and overturning, based on the active earth pressures determined, usinga. Coulomb's earth pressure theory (δ' = 24°), andb. Rankine's earth pressure theory.The unit weight of concrete is 24 .0 kN/m3
A retaining wall 6 m high supports cohesionless soil having a dry density of 1600 kg/m³, angle of resistance 32 and void ratio of 0.68. The surface of the soil is horizontal and level with the top of the wall. Neglecting wall friction and using Rankine’s formula for active pressure of a cohesionless soil.
1. Determine the nearest value of the total earth thrust on the wall in KN per lineal meter if the soil is dry.
a. 73.1
b. 86.7
c. 62.4
d. 98.1
2. Find the nearest value of the thrust on the wall in KN per lineal meter if owing to inadequate drainage, it is waterlogged to a level of 3.5 m below the surface.
a. 112
b. 171
c. 147
d. 153
3. Find at what height above the base of the wall the thrust acts during the waterlogged condition.
a. 2.21 m
b. 2.00 m
c. 1.74 m
d. 1.42 m
A masonry dam (sp.gr. = 2.4) of trapezoidal cross-section is 20 m high. It has a thickness of 2 m at the top and 14 m at the bottomas shown in the figure.Coef. of friction under the foundation is 0.80 and assuming there is hydrostatic upliftthat varies linearly from one-half the hydrostatic head at the upstream edgeof the dam to zero at the downstream edge.Determine
Chapter 18 Solutions
Principles of Foundation Engineering (MindTap Course List)
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 elevation and plan of a bracing system for an open cut in sand are shown in Figure 14.21. Using Pecks empirical pressure diagrams, determine the design strut loads. Given: sand = 18 kN/m3, ' = 38, x = 3 m, z = 1.25 m, and s = 3 m.arrow_forwardPoint loads of magnitude 100, 200, and 400 kN act at B, C, and D, respectively (Figure P6.2). Determine the increase in vertical stress at a depth of 6 m below point A. Use Boussinesq’s equation.arrow_forwardPoint loads of magnitude 9, 18, and 27 kN act at A, B, and C, respectively(Figure 6.27). Determine the increase in vertical stress at a depth of 3 mbelow point D. Using Westergaard solution. Use μs = 0.4.arrow_forward
- Figure 15.53 below shows a cantilever sheet pile driven into a granular soil where the water table is 2 m below the top of the sand. The properties of thesand are: ' = 40, m = 17.5 kN/m3, and sat = 19 kN/m3. It is proposed toexcavate to a depth of 6 m below the ground level. Determine the depth towhich the sheet pile mast be driven, using the net lateral pressure diagram. Fig. 15.53arrow_forwardThe section of a concrete dam is shown in the figure. Concrete weighs 23.5 KN per cubic meter and water weighs 9810 N per cubic meter. Coefficient of friction detween the dam and foundation is 0.60. Assume hydrostatic uplift varies uniformly from full hydrostatic head at the heel of the dam to zero at the toe. Determine the Determine the factors of safety against sliding and against overturning, minimum pressure, and maximum pressure. Consider 1 m length of dam.arrow_forwardTwo vanes A and B, with length-to-diameter ratios of 3 and 1 respectively, are each used to make a test at the depth in a clay layer. Both vanes have a diameter of 50 mm and the torque values measured were 95 N-m for A and 45 N-m for B. Find the values of undrained shear strength on the horizontal and vertical planes at this depth. Explain why undrained strength in clays may vary with direction.arrow_forward
- A steel storage tank 20 m in diameter will be used to hold a liquid petroleum product. When filled, the tank causes a bearing pressure of 150 kPa. The soil underlying the tank has a unit weight of 18.5 kN/m3. For a depth 10 m below the base of the tank, compute the effective vertical stress when the tank is empty and when full, for points beneath the center and beneath the edge.(a) Assume the Boussinesq conditions apply.(b) Assume the Westergaard conditions apply.arrow_forwardA retaining wall 8 m high supports a cohesionless soil having a dry density of 1600 kg/m^3, angle of shearing resistance is 33 degrees and void ratio of 0.68. The surface of the soil is horizontal and level with top of the wall. Neglect wall friction and use Rankine’s formula for active pressure of a cohesionless soil. Determine the value of earth thrust on the wall per meter length if the soil is dry. a. 121 kN b. 186 kN c. 148 kN d. 137 kN determine the value of earth thrust on the wall if water level is 3.5 m below the surface. a. 230 kN b. 250 kN c. 180 kN d. 210 kN find the height above the base of the wall where the thrust acts during the water logged condition. a. 3.50 m b. 2.67 m c. 1.75 m d. 2.25 marrow_forwardRefer to Figure P6.3. Determine the vertical stress increase Δσ at point A with the values q1 = 90 kN/m, q2 = 325 kN/m, x1 = 4 m, x2 = 2.5 m, and z = 3 m.arrow_forward
- A 450 kN force is transmitted by a column footing onto the surface through a square footing 1.5 m on a side. Assuming that the force exerted on the underlying soil formation spreads on 2 vertical to 1 horizontal, evaluate the pressure, in kPa exerted in footing on a soil 2.7 m below it.arrow_forwardThe 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_forwardFrom the figure shown, the soil layer beneath the 203m dam has Kx = 0.3m/day and Kz = 0.4m/day. Determine the following: • Uplift force per unit length (kN/m) • Seepage through the foundation (m^3 /day)arrow_forward
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