10.5 A 12 m × 9 m mat foundation is placed at a depth of 3 m within sand where N6o is 20. Using Eq. (10.14), estimate the elastic settlement when the net applied pressure is 250 kN/m². It is proposed to build a 8 story building with a footprint of 15 m X 20 m, resting on a mat foundation of the same dimensions, in a saturated clay where c,, v = 19.0 kN/m³. Assume approximately 15 kN/m2 per floor 50KN/m², for the live and dead loads. a. At what depth would 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?

10.5 A 12 m × 9 m mat foundation is placed at a depth of 3 m within sand where N6o is 20. Using Eq. (10.14), estimate the elastic settlement when the net applied pressure is 250 kN/m². It is proposed to build a 8 story building with a footprint of 15 m X 20 m, resting on a mat foundation of the same dimensions, in a saturated clay where c,, v = 19.0 kN/m³. Assume approximately 15 kN/m2 per floor 50KN/m², for the live and dead loads. a. At what depth would 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?

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter8: Mat Foundations

Section: Chapter Questions

Problem 8.7P

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Question

10.6

10.5 A 12 m × 9 m mat foundation is placed at a depth of 3 m
within sand where N6o is 20. Using Eq. (10.14), estimate the
elastic settlement when the net applied pressure is 250 kN/m².
It is proposed to build a 8 story building with a footprint
of 15 m X 20 m, resting on a mat foundation of the same
dimensions, in a saturated clay where c,,
v = 19.0 kN/m³. Assume approximately 15 kN/m2 per floor
50KN/m²,
for the live and dead loads.
a. At what depth would 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?

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