Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 16, Problem 16.18CTP
To determine
Find the maximum silo load that can be carried by the ring beam.
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A water tank is required to be constructed with a circular foundation having a diameter of 20m founded at a depth of 5m below the ground surface. The estimated distributed load on the foundation is 400 kN/m2. Assuming that the subsoil extends to a great depth and is isotropic and homogeneous, determine the stresses at points (i) z = 10 m, r = 0, (ii) z = 10 m, r = 10 m, (iii) z = 20 m, r = 0 and (iv) z = 20m, r = 10m, where r is the radial distance from the central axis. Use the Influence Diagram below to calculate the I. Neglect the effect of the depth of the foundation on the stresses.
Q3.
A mat foundation is shown in figure below. The design considerations are L 12 m, B
-10 m, Df 2.2 m, Q = 30 MN, x1 =2 m, x2 2 m, x3 -5.2 m, and preconsolidation pressure oe
= 180 kN/m?. Calculate the consolidation settlement:
under the center of the mat.
• Under the corner of the mat
Size of mat = BXL
Sand
Dr
y = 16.0 kN/m3
X1
Groundwater
table
Sand
Yeat = 18.0 kN/m
Clay
= 17.5 kN/m3
EYsat
e, = 0.88
C = 0.38
C; = 0.1
Chapter 16 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
Ch. 16 - Prob. 16.1PCh. 16 - A 2.0 m wide continuous foundation carries a wall...Ch. 16 - Determine the maximum column load that can be...Ch. 16 - A 2.0 m wide strip foundation is placed in sand at...Ch. 16 - A square column foundation has to carry a gross...Ch. 16 - The applied load on a shallow square foundation...Ch. 16 - A column foundation (Figure 16.23) is 3 m 2 m in...Ch. 16 - Prob. 16.8PCh. 16 - A 2 m 3 m spread foundation placed at a depth of...Ch. 16 - An eccentrically loaded foundation is shown in...
Ch. 16 - For an eccentrically loaded continuous foundation...Ch. 16 - The shallow foundation shown in Figure 16.12...Ch. 16 - A mat foundation measuring 14 m 9 m has to be...Ch. 16 - Repeat Problem 16.13 with the following: Mat...Ch. 16 - Prob. 16.15PCh. 16 - For the mat in Problem 16.15, what will be the...Ch. 16 - Prob. 16.17CTPCh. 16 - Prob. 16.18CTPCh. 16 - A 2.0 m 2.0 m square pad footing will be placed...
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- sit oarrow_forwardDesign the foundation for a gas engine with a vertical cylinder and verticauy oscillating parts, for the following data: 1. Total weight of engine 4500 kg. 2. Speed of rotation 3. Unbalanced vertical force 260 r.p.m. 1 tonne 4. Base dimensions of the engine = 1 m x 2.5 m 5. Elevation of machine base above ground = 1 m %3D %3! Weak silty sand exists to a depth of 0.5 m followed by a dense sand to a depth of 6 m. The unit weight of moist sand is 1.7 t/ m.arrow_forwardThe plan of a flexiblerectangular loaded area is shown with a uniformly distributed load q =100 KN/m2. Determine the increasein the vertical stress (A6z) at Z= 2.0 meters bel ow (a) Point A = (b) Point B= (c) Point C= 4 m 1.6 m- 2 m 0.8 m q = 100 kN/m? C 1.2 m-arrow_forward
- A water tank is required to be constructed with a circular foundation having a diameter of 20m founded at a depth of 2m below the ground surface. The estimated distributed load on the foundation is 300 kN/m². Assuming that the subsoil extends to a great depth and is isotropic and homogeneous, determine the stresses °z at points (i) z = 6m, r = 0, (ii) z = 6m, r = 10m, (iii) z = 20m, r = 0 and (iv) z = 20m, r= 10m, where r is the radial distance from the central axis. Use the Influence Diagram below to calculate the I. Neglect the effect of the depth of the foundation on the stresses. Influence value l, (x100) 0.1 1.0 10 100 1.25 1.5 1.0 1 2.5 3 0.0 0.25 0.5 0.75 3 Note: Numbers on curves indicate value of r/Ro 5 6. -B = 2R, mi HR 7 10 0, = 1.9 10 Fig. 1. Influence Diagram for the Vertical Normal Stress at Various Points Under a Uniformly Loaded Circular Area (Foster and Ahlvin, 1954) 4. 00 Depth z/Roarrow_forwardA mat foundation is shown in Figure P8.6. The design considerations are L = 12 m, B = 10 m, Df = 2.2 m, Q = 30 MN, x1 = 2 m, x2 = 2 m, x3 = 5.2 m, and preconsolidation pressure σ'c < 105 kN/m2. Calculate the consolidation settlement under the center of the mat.arrow_forwardThe attached figure shows the plan of rectangular foundation which transmits a uniform contact pressure of 120 kN/m2. The width of the foundation is 15 m. A) Determine the increase in vertical pressure at a depth of 10 m below point A B) The vertical stress at a depth of 10m below point Barrow_forward
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