Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Textbook Question
Chapter 16, Problem 16.14P
Repeat Problem 16.13 with the following:
• Mat foundation: B = 8 m, L = 20 m, and Df = 2 m
• Clay:
16.13 A mat foundation measuring 14 m × 9 m has to be constructed on a saturated clay. For the clay, cu = 93 kN/m2 and
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H.W 2.pdf >
H.Q 6
A flexible foundation measuring 1.5 m x 3 m is supported by a
saturated clay. Given: Dr = 1.2 m, H = 3 m, Es (clay)= 600 kN/m2, and qo
= 150 kN/m?. Determine the average elastic settlement of the
foundation.
H.O 7
Figure 7.3 shows a foundation of 10 ft x 6.25 ft resting on a sand
deposit. The net load per unit area at the level of the foundation, qo, is
3000 Ib/ft?. For the sand, u, = 0.3, Es = 3200 Ib/in?, Df = 2.5 ft, and H
= 32 ft. Assume that the foundation is rigid and determine the elastic
settlement the foundation would undergo.
H.O 8
Determine the net ultimate bearing capacity of mat foundations with
the following characteristics:
c, = 2500 Ib/ft, = 0, B = 20 ft, L = 30 ft, D, = 6.2 ft
Foundation Engineering I
H.W 2
H.O 9
A 20-m-long concrete pile is shown in Figure below. Estimate the
ultimate point load Q, by
a. Meyerhof's method
b. Coyle and Castello's method
Concrete pile
460 mm x 460 mm
Loose sand
20m
y I86 ANi
Dee s
H.O 10
A concrete pile 20 m long…
10. 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…
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.
Chapter 16 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
Ch. 16 - Prob. 16.1PCh. 16 - A 2.0 m wide continuous foundation carries a wall...Ch. 16 - Determine the maximum column load that can be...Ch. 16 - A 2.0 m wide strip foundation is placed in sand at...Ch. 16 - A square column foundation has to carry a gross...Ch. 16 - The applied load on a shallow square foundation...Ch. 16 - A column foundation (Figure 16.23) is 3 m 2 m in...Ch. 16 - Prob. 16.8PCh. 16 - A 2 m 3 m spread foundation placed at a depth of...Ch. 16 - An eccentrically loaded foundation is shown in...
Ch. 16 - For an eccentrically loaded continuous foundation...Ch. 16 - The shallow foundation shown in Figure 16.12...Ch. 16 - A mat foundation measuring 14 m 9 m has to be...Ch. 16 - Repeat Problem 16.13 with the following: Mat...Ch. 16 - Prob. 16.15PCh. 16 - For the mat in Problem 16.15, what will be the...Ch. 16 - Prob. 16.17CTPCh. 16 - Prob. 16.18CTPCh. 16 - A 2.0 m 2.0 m square pad footing will be placed...
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- Please solve this question. Q. No. 1: A foundation 4x4 m is located at a depth of 1 m in a layer of saturated clay 13 m thick. Characteristic Parameters for the clay are cu=100 kN/m2, u=0, c'=0, '=32o, Cc=0.36, eo=0.784, NCC, sat=21 kN/m3. Determine the design load of the foundation to ensure (a) a factor of safety with respect to shear failure of 3 using the traditional method, (b) consolidation settlement does not exceed 30 mm.arrow_forwardConsider 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_forwardFollowing are the results of a standard penetration test in the field (sandy soil): Depth (m) Field value of N60 1.5 3.0 12 4.5 11 6.0 7.5 13 9.0 11 10.5 13 Estimate the net allowable bearing capacity of a mat foundation 6.5 m x 5.0 m in plan. Here, Df = 1.5 m , and allowable settlement 50 mm. Assume that the unit weight of soil (v) = 16.5 KN/m³ Select one: O a. 30.23 kN/m2 O b. 365.86 kN/m² c. 302.3 kN/m2 O d. 302.3 N/marrow_forward
- For the rigid shallow foundation (2*4m) shown in Fig, calculate Immediate settlement the center of the foundation if . (net pressure qo = 100 kPa. Assume 0.3 X 2 m 0.5 m 3.5 m W.T Q=2000 kN 6 m-3 m y=22 kN/m² Ce=0.805 C₁ = 0.3 e=0.753 OCR = 1.4 G. s Dense Sand Y = 22 kN/m³ Silty Clay Silty Sand Y = 18 kN/m²arrow_forwardPROBLEMS 8.1 Refer to Figure 8.3. For a flexible load area, given: B= 3 m, L=4.6m, q= 180KN/m², D; =2m, H = 00, v= 0.3, and E = 8500KN/m³. Estimate the elastic settlement at the center of the loaded area. Use Eq. (8.14). %3D Foundation B×L Rigid :foundation Flexible foundation H settlement settlement v = Poisson's ratio E = Modulus of elasticity Soil Rock Figure 8.3 Elastic settlement of flexible and rigid foundations. (8.14)arrow_forwardThe attached figure shows the plan of rectangular foundation which transmits a uniform contact pressure of 120 kN/m2. The width of the foundation is 15 m. A) Determine the increase in vertical pressure at a depth of 10 m below point A B) The vertical stress at a depth of 10m below point Barrow_forward
- 9.6 A mat foundation is shown in Figure P9.6. The design considerations are L = 12 m, B = 10 m, D = 2.2 m, Q = 30 MN, x₁ = 2 m, x₂ = 2 m, x3 = 5.2 m, and precon solidation pressure o 105 kN/m². Calculate the conso dation settlement under the center of the mat. D₁ X3 Figure P9.6 Size of mat = B x L Vo Clay Ysat = 17.5 kN/m³ €= 0.88 C=0.38 C₁ = 0.1 Sand y= 16.0 kN/m³ Water table Sand Ysat = 18.0 kN/m³arrow_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 square footing is proposed to be constructed on the silty sand layer as shown in Figure Q2. If the gross load (Qall) is 600 kN, check whether the foundation can carry the load or not. (Use Terzaghi's bearing capacity equation with general shear failure and FS = 3). 2. Qall Silty Sand 1.5 m y 19 kN/m c' 8 kN/m2 = 25° Ground Water 0.5 m 1.2 m Level Kar 19.0 kN/m' Figure Q2: A Square Footingarrow_forward
- 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.arrow_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_forward9.6 A mat foundation is shown in Figure P9.6. The design considerations are L= 12 m, B = 10 m, Dy= 2.2 m, Q = 30 MN, x₁ = 2 m, x₂ = 2 m, x3 = 5.2 m, and precon solidation pressure o≈ 105 kN/m². Calculate the conso dation settlement under the center of the mat. D₁ X3 Figure P9.6 Size of mat = B x L Vo Clay Ysat = 17.5 kN/m³ €= 0.88 C=0.38 C₁=0.1 Sand y = 16.0 kN/m³ Water table Sand Ysat = 18.0 kN/m³arrow_forward
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