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Author: Ryan E.
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2003-06-05 |
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Does anyone know a reference for at-rest earth pressures for sloping (downward) backfill?
Thanks
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Follow-up:
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Author:
Tom Sklucki
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2003-07-15 |
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The previous replies both relate to lateral earth pressures for a soil in active state (coefficient Ka).
Try page 41 of the book:
Joseph E Bowles
Foundation Analysis and Design
McGraw Hill
Fifth Edition, 1996
ISBN 0-07-912247-7
Lateral earth pressure 'at rest' (coefficient Ko)
Bowles refers to a Kezdi (1972) as suggesting for sloping ground Ko=(1-sin(phi'))/(1+sin(beta))
- where (phi') is effective angle of internal friction
and (beta) is slope angle beta measured above the horizontal.
When beta is zero, i.e horizontal ground, this reduces to commonly used 'Jaky Equation' for normally consolidated soils i.e Ko=1-sin(phi'))
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Follow-ups:
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Subject:
At-Rest Pressures for Sloping Backfill 