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 7.6P
To determine
Find the maximum wall load allowed by the foundation, if the factor of safety is 3.
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A 8 m layer of sand, of saturated unit weight 22 kN/m3, overlies a 6 m layer of clay, of saturated unit weight 27 kN/m3.
A foundation carrying 1200 KN load is to be founded on the soil layer. If the clay is normally consolidated and the
increase in effective pressure due to the foundation load at the center of clay is 27 kN/m2, Soil parameters are Cc =
0.25, eo = 1.0. Assume required data
•Draw the soil profile diagram in detail, mentioning all the soil properties with the foundation details. •Calculate the
consolidation settlement at the center of the clay layer.
A sandstone bed with RQD=70% and γ=26.0 kN/m3 lies beneath 1.5m of overburden soil. A 2.0m x 2.0m square foundation is to be placed on top of the sandstone rock (i.e., at a depth below the ground level) to carry a column load. The unit weight of the soil is 18.0 kN/m3. Assuming the rock strength parameters has quc=50 MN/m2 and ∅=35°, determine the maximum load that can be allowwd on the foundation with the safety factor FS=3. The compressive strength f'c of concrete is 30.0 MN/m2.
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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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- A 2 m wide continuous foundation is placed at 1 m depth within a 1.5 m thick sand layer that is underlain by a weaker clay layer. The soil properties are as follows: Upper sand layer: unit weight = 18.0 kN/m2, d' = 38° Lower clay layer: unit weight = 19.0 kN/m, undrained shear strength = 25 kN/m2 Determine the maximum wall load that can be allowed on the foundation with FS = 3.arrow_forwardA sandstone bed with RQD = 70% and y = 26.0 kN/m³ lies beneath 1.5 m of overburden soil. A 2.0 m X 2.0 m square foundation is to be placed on top of the sandstone rock (i.e., at a 1.5 depth below the ground level) to carry a column load. The unit weight of the soil is 18.0 kN/m³. Assuming the rock strength parameters from Problem 7.17,arrow_forwardI need the answer as soon as possiblearrow_forward
- 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 = 17 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 = 18 kN/m3. What would be the maximum wall load allowed with FS = 4?arrow_forwardA foundation 2 m wide x 4 m long, carrying a uniform pressure of 150 kPa, is located at a depth of 1 m in a layer of clay 5 m thick for which the value of E, is 40 MPa. This layer is underlain by a second clay layer 8 m thick for which the value of E is 75 MPa. v₁ = 0.5. A hard stratum lies below the second layer. Determine the average immediate settlement under the foundation.arrow_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
- Problem 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_forward10. A flexible foundation is subjected to a uniformly distributed load of q-500 kN/m². Table 3 could be useful. Determine the increase in vertical stress, in kPa, Aoz at a depth of z=3m under point F. B 4m 3m 6m E 10m Table 10.3 Variation of I, with m and n m 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0.1 0.0047 0.0092 0.0270 0.0279 0.2 0.0132 0.0092 0.0179 0.0259 0.0132 0.0259 0.0374 0.0222 0.0242 0.0435 0.0474 0.0629 0.0686 0.0258 0.0504 0.0528 0.0547 0.3 0.0731 0.0766 0.0794 0.4 0.1013 0.5 0.0198 0.0387 0.1202 0.6 0.0222 0.0435 0.7 0.0242 0.0474 0.0947 0.1069 0.1168 0.1247 0.1311 0.1361 0.1365 0.1436 0.1491 0.1537 0.1598 0.0168 0.0198 0.0328 0.0387 0.0474 0.0559 0.0168 0.0328 0.0474 0.0602 0.0711 0.0801 0.0873 0.0931 0.0977 0.0559 0.0711 0.0840 0.0947 0.1034 0.1104 0.1158 0.0629 0.0801 0.0686 0.0873 0.1034 0.8 0.0258 0.0504 0.0731 0.0931 0.1104 0.9 0.0270 0.0528 0.0766 0.0977 0.1158 0.0794 0.1013 0.1202 0.0832 0.1263 1.4 0.1300 1.6 0.0306 0.0599 0.0871 0.1114 0.1324 1.8 0.0309 0.0606…arrow_forwardRefer to Figure P5.5. Using the procedure outlined in Section 5.5, determine the average stress increase in the clay layer below the center of the foundation due to the net foundation load of 900 kNarrow_forward
- Prob. 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_forwardThe plan of a rectangular foundation shown in figure transmits a uniform contact pressure of 120 kN/m². Determine the vertical stress induced by this loading at point B under a depth of 5 m. (40 marks) 25.0- 15.0 6.0- 4.0 B•arrow_forwardA concrete foundation 3 m wide, 9 m long and 0.75 m thick is to be founded at a depth of 1.5 m in a deep deposit of dense sand. The angle of shearing resistance of the sand is 35° and its unit weight is 19 kN/m². The unit weight of concrete is 24 kN/m³. Using the working stress design approach with a factor of safety, Fs = 3.0: Determine the safe bearing capacity of the sand deposit under the prevailing conditions. Determine the safe bearing capacity of the foundation if it is subjected to a vertical load of 2200 kN and a horizontal load of 500 kN. The resulting eccentricity is 0.3 m in the foundation width (B) direction QpCarrow_forward
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