Foundation Design: Principles and Practices (3rd Edition)
3rd Edition
ISBN: 9780133411898
Author: Donald P. Coduto, William A. Kitch, Man-chu Ronald Yeung
Publisher: PEARSON
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Chapter 2, Problem 2.11QPP
To determine
The factor of safety required.
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Propose an example similar to the problem posed, where the soil is cohesive-frictional.
The foundation (base) of a long retaining wall is required to support the load (including self-weight of the base and the wall) and moment (this comes from the lateral loads on the wall) shown in Figure below
Determine the factor of safety against bearing capacity failure (using TCVN & Terzaghi bearing capacity theory)
Would the settlement of the base be uniform?
Discuss your answer.
A cylindrical sample of saturated clay 4 cm in diameter and 8 cm high was tested in an unconfined compression apparatus. Find the unconfined compression strength, if the specimen failed at an axial load of 360 N, when the axial deformation was 8 mm. Find the cohesion in kPa if the angle made by the failure plane with the horizontal plane was recorded as 50°. Include free body diagram.
a.312
b.106
c.258
d.210
Chapter 2 Solutions
Foundation Design: Principles and Practices (3rd Edition)
Ch. 2 - Classify the uncertainty associated with the...Ch. 2 - Figure 2.1 shows the PDF for a normal distribution...Ch. 2 - List three sources of epistemic uncertainty...Ch. 2 - Using a random number generator create a sample of...Ch. 2 - A certain column will carry a dead load estimated...Ch. 2 - A simply supported beam has a length of 3 m and...Ch. 2 - Using the data shown in Figure 2.5 determine the...Ch. 2 - The capacity for a certain foundation system is...Ch. 2 - We wish to design a shallow foundation with a...Ch. 2 - Prob. 2.10QPP
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- A rectangular footing with dimensions of 8ft x 12ft is constructed at the surface of the ground and supports a column with a load of 192,000 lbs. The load applied to the footing results in a uniform stress distribution at the base of the footing. What is the change in vertical stress 12 feet below the ground, underneath Point A, at the corner, on the diagram?arrow_forwardA square footing supporting a new building applies a uniform pressure of 200 kPa to the ground surface. The water table is at the ground surface and the site is underlain by a homogeneous sand deposit. Based on the bulbs of pressure developed below the footing depicted in the figure below, which of the following statements are correct (select all that apply)? A.After construction, the vertical total stress (σ) at Points B and C is the same. B.After construction, the increase in vertical total stress (∆σ) at Points B and C is the same. C.After construction, the increase in vertical total stress (∆σ) at Point A is three times lower than ∆σ induced at Point B. D.After construction, the vertical effective stress (σ’) at Point A is by coincidence the same as the vertical effective stress induced at Point B.arrow_forwardSubject: Soil Mechanics Please provide a solution and a diagram A granular soil is subjected to a minor principal stress of 200 kN/m2. If the angle of internal friction is 30°. What is the shear stress on the plane of failure? a. 173.2 b. 224.2 c. 200 d. 300arrow_forward
- A square footing supporting a column applies a uniform pressure of 100 kPa on top of a deep clay deposit. Based on the bulbs of pressure developed below the footing shown in the following figure, which of the following statements are correct (select all that apply)? A.Immediately after construction, the excess pore water pressure (∆u) developed at Point A remains lower than ∆u developed at Point B B.Immediately after construction, the excess pore water pressures (∆u) developed at Points B and C are the same C.Since the clay layer is homogeneous, one-dimensional Terzaghi’s theory of consolidation can be applied to provide an accurate estimate of the rate of consolidation at Points A, B, and C. D.After construction, three-dimensional seepage occurs below the foundation as the excess pore water pressures dissipate.arrow_forwardTthe footing shown in a figure below is subjected to a uniform load of 300KPa. Calculate the vertical stress component at 2m below point A. Using the concept of superposition of concentrated loadsarrow_forwardDatasheet for consolidation test Load,kN/m? Dail reading &H=dail reading*0.01mm 25 27 0.27 50 46 0.46 100 72.3 0.723 200 101.5 1015 400 135 1.35 800 186.9 1.869 200 169.9 1.699 50 149.5 1.495 Find: 1.The coefficient of volume compressibility, m, 2. Compression index, C, 3. Preconsolidation load, P, 4. The coefficient of consolidation, c,arrow_forward
- A square footing supporting a new building applies a uniform pressure of 200 kPa on the ground surface. The water table is at the ground surface and the site is underlain by a homogeneous sand deposit. Based on the bulbs of pressure developed below the footing depicted in the figure below, calculate the vertical total stress in kPa at point C (acceptable tolerance = 2%).arrow_forwardA soil profile is shown in Figure Q2 (a). Calculate the total stress, pore waterpressure and effective stress at points A, B, C and D. Hence, plot the variations of thestresses with depth. Given: H1 = 4.7 m H2 = 6.4 m H3 = 3.8 me= 0.55 Ysat= 19.1kN/m3 w= 24%Gs = 2.61 e= 0.64arrow_forwardA 4-m diameter circular footing is supporting a water tank. The total weight of the footing, tank and its contents is 1.60 MN. Using the Bousinessq equation: ?? = ? × ?? where ?? = 1 − 1/? and ? = [(?/?) 2 + 1] 3/2 , determine: a. The pressure at the base of the footing b. The increase in pressure at a depth of 4 meters below the base of the footing c. The depth below the base of the footing where pressure increase is equal to 1/6 pressure at the base of the footingarrow_forward
- A cylindrical specimen of saturated clay, 4.5 cm in diameter, and 9 cm long, is tested in an unconfined compression apparatus. Find the cohesion in kPa if the specimen fails at an axial load of 450 N. The change in length of the specimen at failure is 9 mm. a.130 b.128 c.126 d.132arrow_forwardHW?2 - Classification of Rocks The following data have been collected from uni-axial load test for rock specimen with diameter and height of § cm and 10 cm, respectively. [Load (kg) | 1050 | 1680 | 3070 | 5850 | 3340 | 2760 | 2710 | 2680 Strain | 003 | 005 | 0.09 | 014 | 019 | 025 | 029 | 034 1- Calculate 0y (kg/em®) 2- Find Modulus of initial tangent 3- Classify the rock according to its strength and modulus of elasticity.arrow_forwardCalculate the factor of safety of the fill given below against sliding. The unit weight of the material forming the fill is 17 kN/m3. The cohesion acting along the failure surface is 10 kPa and the internal friction angle is 28°.arrow_forward
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