Principles of Foundation Engineering, SI Edition
8th Edition
ISBN: 9781305446298
Author: Braja M. Das
Publisher: Cengage Learning US
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Chapter 5, Problem 5.8P
To determine
Find the net allowable load supported by the foundation.
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9.10 A continuous foundation on a deposit of sand layer is shown in
Figure P9.10 along with the variation of the cone penetration
1.5 m
Sand
FIGURE P9.10
2.5 m
0
2
∞
14
9 = 195 kN/m²
I
I
Depth (m)
9c=1750
9c = 3450
9c = 2900
qe (kN/m²)
Problem 2: A rectangular foundation of 4m × 6m (as shown in Figure P2) transmits a stress
of 150 kPa on the surface of a soil deposit. Plot the distribution of induced vertical
stresses with depth under points A (the centre of the rectangle), B and C up to a depth of
20 m.
6m
4m
A
Figure P2
B
2m
с
2m
subject - geotechnical design
book - principle of foundation engineering
Chapter 5 Solutions
Principles of Foundation Engineering, SI Edition
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- Refer 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_forwardA 2-m diameter flexible foundation applies a uniform pres- sure to the underlying soil of 200 kN/m. Plot the varia- tion of the vertical stress increase below the center of the foundation as determined using both the Boussinesq (Aop) and Westergaard (Aow) solutions up to a depth of z = 5 m. (Note: p, 0.2.) 8.14arrow_forwardA square foundation is shown in Figure P4.12. Use FS = 6, and determine the size of the foundation. Use Prakash and Saran theory [Eq. (4.55)].arrow_forward
- S1arrow_forwardExample 5.7 Consider a rectangular foundation 2 mx 4 m in plan at a depth of 1.2 m in a sand deposit, as shown in Figure 5.23a. Given: y = 17.5 kN/m³; ā = 145 kN/m², and the following approximated variation of qc with z: 1.2 m q=145 kN/m² ++++y=17.5 kN/m³ z (m) 9c (kN/m²) B=2m- 0-0.5 2250 L=4 m 0.5-2.5 3430 2.5-5.0 2950 Estimate the elastic settlement of the foundation using the strain influence factor method.arrow_forwardA rectangular foundation of 4m x 6m (as shown in Figure 4) transmits a stress of 150 kPa on the surface of a soil deposit. Plot the distribution of induced vertical stresses with depth under points A (the centre of the rectangle), B and C up at the depth of 3 m. 4m 6m А 2m C 2m Figure 4arrow_forward
- Please solve under Geotechnology II.arrow_forwardsubject : Geotechnical Design Book : PRINCIPLE OF FOUNDATION ENGINEERINGarrow_forwardRefer to Figure P6.8. Using the procedure outlined in Section 6.8, determine the average stress increase in the clay layer below the center of the foundation due to the net foundation load of 50 ton.arrow_forward
- A square column foundation is to be constructed on a sand deposit (C = 0). The allowable load Q will be inclined at an angle b Ø = 20° with the vertical. Knowing that y = 16.5 KN/ m3 and Df = 1 m. The standard Penetration numbers N60 obtained from the field are as follows. Determine value of Q ? Depth (m) N60 1.5 3 3.0 6 4.5 6.0 10 7.5 10 B- 1.25 m- Select one: a. 110 KN O b. 151.7 KN c. 95 KN d. 155.3 KNarrow_forwardProblem 1. A column foundation (Figure below) is 3 m × 2 m in plan. The load on the column, including the weight of the foundation is 4500 kN. Determin the average vertical stress increase 4 m beneath the corner of the foundation in the soil layer due to the foundation loading by: a) Boussinesq equations b) 2:1 method Given: Df = 1.5 m, Ø'= 25°, c'= 70 kN/m². 1.5 m 1 m 3m x 2m y = 17 kN/m³ Water level Ysat 19.5 kN/m³arrow_forward7.14 Refer to Figure 7.15. For a foundation on a layer of sand, given: B = 5 ft, L = 10 ft, d = 5 ft, B = 26.6°, e = 0.5 ft, and & = 10°. The Pressuremeter testing at the site pro- duced a mean Pressuremeter curve for which the pam) versus AR/R, points are as follow. AR/R. (1) P,(m) (lb/in.?) (2) 0.002 7.2 0.004 24.2 0.008 32.6 0.012 42.4 0.024 68.9 0.05 126.1 0.08 177.65 0.1 210.5 0.2 369.6 What should be the magnitude of Q, for a settlement (center) of 1 in.? Foundation BxL В Figure 7.15 Definition of parameters-B,arrow_forward
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