Principles of Foundation Engineering (MindTap Course List)
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 10.6P

(a)

To determine

Find the depth of the foundation.

(b)

To determine

Find the factor of safety.

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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? REFERENCE
An office building is to be supported on 150 ft : 300 ft mat foundation. The sum of the columnloads plus the weight of the mat will be 90,000 k. According to a settlement analysis conductedusing the techniques described in Chapter 8, the total settlement will be 1.8 in. The groundwatertable is at a depth of 10 ft below the bottom of the mat. Using the pseudo-coupled method,divide the mat into zones and composite each zone. Then indicate the high-end and low-endvalves of ks that should be used in the analysis.
Q3. A mat foundation is shown in figure below. The design considerations are L 12 m, B -10 m, Df 2.2 m, Q = 30 MN, x1 =2 m, x2 2 m, x3 -5.2 m, and preconsolidation pressure oe = 180 kN/m?. Calculate the consolidation settlement: under the center of the mat. • Under the corner of the mat Size of mat = BXL Sand Dr y = 16.0 kN/m3 X1 Groundwater table Sand Yeat = 18.0 kN/m Clay = 17.5 kN/m3 EYsat e, = 0.88 C = 0.38 C; = 0.1
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