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 7, Problem 7.7P
Redo Problem 7.6 using Vesic’s (1975) solution [Eq. (7.12)].
7.6 A 2.0 m wide continuous foundation is placed at 1.5 m depth in a saturated clay where cu = 40 kN/m2 and γ = 18.5 kN/m3. At 2.0 m below the ground level, this clay layer is underlain by a stiffer clay where cu = 60 kN/m2 and γ = 19.0 kN/m3. What would be the maximum wall load allowed with FS = 3? Use Eq. (7.11).
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A column foundation [ 2.0 m x (1.7m] in size is located at a depth of 1.4 m in a strong cohesive soil layer 2.4 m thick has a unit weight of 19.7 kN/m3, cohesion of 29 kN/m2 and , friction angle of 28o. This layer overlies a weaker cohesive soil layer 15 m thick has a unit weight of 16.3 kN/m3, cohesion of 8 kN/m2 and friction angle of 20o. Determine the allowable foundation load if the factor of safety is 2.5. Show all the related labeled sketches clearly.
Solve Problem 5.6 using Eq. (5.11).
Chapter 7 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 7 - A 7.5 ft wide rough continuous foundation is...Ch. 7 - In Problem 7.1, if there was no bedrock present...Ch. 7 - A 1.5 m × 2.0 m rectangular foundation is placed...Ch. 7 - In Problem 7.3, if no bedrock was present for at...Ch. 7 - Prob. 7.6PCh. 7 - Redo Problem 7.6 using Vesic’s (1975) solution...Ch. 7 - Prob. 7.8PCh. 7 - Prob. 7.9PCh. 7 - A continuous foundation having a width of 1.5 m is...Ch. 7 - A 2 m wide continuous foundation is to be placed...
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- Please answer question 3b Question 3barrow_forwardProblem II. The initial principal stresses at a certain depth in a clay soil are 100 kPa on the horizontal plane and 50 kPa on the vertical plane. Construction of a surface foundation induces additional stresses consisting of a vertical stress of 45 kPa, a lateral stress of 20 kPa, and a counterclockwise (with respect to the horizontal plane) shear stress of 40 kPa. a. Plot Mohr's circle (1) for the initial state of the soil and (2) after construction of the foundation. b. Determine the change in magnitude of the principal stresses. C. the change in maximum shear stress d. the change in orientation of the principal stress plane resulting from the construction of the foundation.arrow_forwardS1arrow_forward
- Consider the case of a continuous foundation with B = 2 m, Dr = 2.0 m, and H=2.0 m. The following are given for the two soil layers: = 32° Top sand layer (stronger layer): Unit weight y₁ = 17.5 kN/m³, 1= 32°, C'₁ = 0 Bottom clay layer (weaker layer): Unit weight y2 = 16.5 kN/m³, 2= 0, Cu (2) = 25 kPa, Determine the gross ultimate load per unit length of the foundation. Ne N₁ Ny 35.49 23.18 30.22arrow_forwardProb. 3) Referring to the figure below: A) Compute the average increase in stress Ao below the centre of the footing for the clay layer 2. B) Compute the elastic settlement of the clay assuming a shallow foundation. OCR=3, P.I-30%, C-120 kPa, us=0.5. P= 1350 kN G.S. ydry= 17.7 kN/m³ 3 m Clay1 3.mx6 m. 2 m W.T. 2 m ysat= 20 kN/m3 4 m Clay2 ysat= 21 kN/m3 Rigid rock CS Scanned with CamScannerarrow_forwardQuestion 1) For a shallow foundation measuring (1.7 m x 2.2 m) as shown below: , A. Estimate the elastic settlement proposed by Mayerhof. Then, B. Estimate the elastic settlement proposed by Bowles, if the water table rises 1.5 m. Then, Use yw=10 kN/m³ qnet= 1.2 MN/m2 G.S 1.5 m Sand Yd=16 kN/m³ Ysat= 17 kN/m3 %3D 2.5 m N60=52 V W.T. Silty Sand Ya=18 kN/m³ Ysat = 18.5 kN/m? N60=52 3.5 m Sand Ya=19 kN/m3 Ysat = 22 kN/m³ e, = 0.4, Ae=0.04 , o'= 194 kN/m2 5 m Cc= 0.3, Cs= 0.2 , Ca= 0.05 N60=60 CS Scanned with CamScannerarrow_forward
- Redo Problem 7.6 using Vesic's (1975) solution [Eq. (7.12)]. 7.6 A 2.0 m wide continuous foundation is placed at 1.5 m depth in a saturated clay where c, = 40 kN/m? and y = 18.5 kN/m³. At 2.0 m below the ground level, this clay layer is underlain by a stiffer clay where c, = 60 kN/m? and y = 19.0 kN/m³. What would be the maximum wal1 load allowed with FS 3? Use Eq. (7.11).arrow_forwardAnswer the following question with all steps pleasearrow_forwardThe initial principal stresses at a certain depth in a clay soil are 200 kPa on the horizontal plane and 100 kPa on the vertical plane. Construction of a surface foundation induces additional stresses consisting of a vertical stress of 45 kPa, a lateral (horizontal) stress of 20 kPa, and a counterclockwise (with respect to the horizontal plane) shear stress of 40 kPa. Plot Mohr's circle (1) for the initial state of the soil and (2) after construction of the foundation. Determine (a) the change in magnitude of the principal stress, (b) the change in maximum shear stress, and (c) the change in orientation of the principal stress plane resulting from the construction of the foundation.arrow_forward
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