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 10, Problem 10.3P
To determine
Find the net ultimate bearing capacity of the mat foundation.
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Problem.№₂3 -
The plan of a mat foundation is shown in Figure. Calculate the soil pressure at points A, B, C,
D, E, and F. (Note: All column sections are planned to be 0.5 m 3 0.5 m.) All loads shown are
factored loads according to ACI 381-11 (2011).
550 KN
2000 KN
5.25 m
2000 KN
550 kN
F
*K
0.25 m
G
H
10 m
! B
i 660 kN
2000 KN
10 m
2000 KN
660 kN
E
600 KN
1600 KN
5.25 m
10 m
1600 KN
470 kN
C
D
*K
0.25 m
9 m
9 m
9 m
0.25 m
0.25 m
A 30 x 24 ft mat foundation is to be placed at 9 ft depth in a saturated clay where Cu= 1200
Ib/ft² and - 0. Find the net ultimate bearing capacity.
Refer to Figure 5.12. For a rectangular foundation on layered sand, given:●● B = 4 ft, L = 6 ft, H = 2 ft, Df = 3 ft●● γ1 = 98 lb/ft3, Φ'1 = 30º, c'1 = 0●● γ2 = 108 lb/ft3, Φ'2 = 38º, c'2 = 0Using a factor of safety of 4, determine the gross allowable load the foundation can carry.
Chapter 10 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 10 - Refer to the rectangular combined footing in...Ch. 10 - Prob. 10.2PCh. 10 - Prob. 10.3PCh. 10 - Prob. 10.4PCh. 10 - Prob. 10.5PCh. 10 - Prob. 10.6PCh. 10 - Prob. 10.7PCh. 10 - Prob. 10.8PCh. 10 - A plate loading test was carried out on a medium...Ch. 10 - A 300 mm 450 mm plate was used in carrying out a...
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- Consider a continuous foundation of width B = 1.4 m on a sand deposit with c = 0, = 38, and = 17.5 kN/m3. The foundation is subjected to an eccentrically inclined load (see Figure 6.33). Given: load eccentricity e = 0.15 m, Df = 1 m, and load inclination = 18. Estimate the failure load Qu(ei) per unit length of the foundation a. for a partially compensated type of loading [Eq. (6.89)] b. for a reinforced type of loading [Eq. (6.90)]arrow_forward9.3 Given: T- shape foundation as shown in figure is loaded with a uniform load of 120 kN/m². Required: the increment in vertical stress at point (P) at a depth of 5m. 0.6 0.6 0.6 3m m n I₁ 1.5 0.3 0.0629 0.1431 9m 1.2 3m 0.6 0.1069arrow_forward2 ft 2 ft 24 ft 24 ft 24 ft Problem 4 B D E F G | 3 ft DL=100 kip DL=180 kip LL = 60 kịp LL = 120 kip DL=190 kip DL=110 ki • The plan of a mat foundation with column loads is shown in Figure 2. Use the rigid method to calculate the soil pressures at point A, B, C, D, E, F, G, H, , J, K, L, M and N. The size of the mat is 76 ft x 96 ft, all columns are 24 in x 24 in in section, and qlnet = 1.5 kip/ft². Verify that the soil pressures are less than the net allowable bearing capacity. LL = 120 kip LL = 70 ki 30 ft DL=180 kip DL=400 kip DL=200 kip LL = 250 kip LL = 120 kip DL=360 kip LL = 120 kip LL = 200 kip ex 30 ft DL-190 kip DL=500 kip LL = 130'kip LL = 240 kip DL=T10 kip DL=200 kip LL =300 kip LL =120 kip 30 ft DL=180 kip DL=120 kip LL =120 kip L =70 kip x' 3 ft IDL=120 kip DL=180 kip ILL =70 kip LL =120 kip J Figure 2: Plan of a Mat Foundation M L K Harrow_forward
- a. At Wlmat depiI W ld you place the mat to make this a fully compensated foundation? b. What should be the factor of safety if the mat is placed at 3.0 m depth? a A 15 m X 20 m mat foundation shown in Figure P10.7 car- ries a building load of 36 MN and is placed at 3.0 m depth below the ground level. a. Find the net applied pressure on the underlying ground. The consolidation tests show that the preconsolidation pressure at the middle of the clay layer is 210 kN/m². b. Is the clay overconsolidated? REFERENCEarrow_forwardA 30*40 ft mat foundation is to be placed at 9ft depth in a saturated clay where cu=1200 lb/ft2 and phi=0.find the net ultimate bearing capacityarrow_forwardSubject : Geotechnical Engineering Df=5ft, B=2ft, H=10ft, and Es=5000 psi, q=200 psf Determine the elastic settlement of a square foundation on saturated clay layer.arrow_forward
- 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.arrow_forwardDetermine the net ultimate bearing capacity of a mat foundation measuring 45 ft × 30 ft on saturated clay with ???? = 1950 lb/ft2, ?? = 0, and ???? = 6.5 farrow_forwardRefer to Figure 5.9. For a continuous foundation in two-layered clay, given:●● γ1 = 121 lb/ft3, cu(1) = 1000 lb/ft2, Φ1 = 0●● γ2 = 115 lb/ft3, cu(2) = 585 lb/ft2, Φ2 = 0●● B = 3 ft, Df = 1.65 ft, H = 1.65 ftFind the gross allowable bearing capacity. Use a factor of safety of 3.arrow_forward
- A 30x24 ft mat foundation is to be placed at9 ft depth in a saturated clay where cu=1200 lb/ft2 and angle zero find ultimate bearing capacityarrow_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_forwardDetermine the contact pressure under the corners of the (4.5 m x 4.5 m) foundation shown in Figure (3) for a (1000 kN) eccentric loading. B A 10.6 m Figure 3 0.4m Xarrow_forward
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