At-Rest Pressure Coefficient (Ko) with Sloping Backfill
At-Rest Pressure Coefficient (Ko) with Sloping Backfill
(OP)
This sounds like an easy one, but I have not been able to find a reference. Does anyone know of one?
Thanks
Thanks
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
At-Rest Pressure Coefficient (Ko) with Sloping Backfill
|
RE: At-Rest Pressure Coefficient (Ko) with Sloping Backfill
Rational: For a friction angle of 32 degrees, Rankine Ka is 0.31 and Ko (using 1-sin(phi)) is 0.47. 0.47/0.31 is 1.52, which is close enough to 1.5. I used this in graduate school (JM Duncan) as rational for the sloping backfill problem and he had no problem with it. Your milage may vary. . . .
f-d
RE: At-Rest Pressure Coefficient (Ko) with Sloping Backfill
RE: At-Rest Pressure Coefficient (Ko) with Sloping Backfill
RE: At-Rest Pressure Coefficient (Ko) with Sloping Backfill
RE: At-Rest Pressure Coefficient (Ko) with Sloping Backfill
I agree and did not mean to imply otherwise. If you refer to my post, I said to determine Ka using any method that you chose. The justification of using a 1.5 factor is based on the simple observation of how the pressures vary under a horizontal backfill scenario. I realize this is different from the problem statement, but the use of a 1.5 factor would apply whether it's horizontal or sloping. Maybe I'm not making sense, but I agree that Rankine is for horizontal. You can take the Ka log spiral and multiple it by 1.5 to get an at-rest pressure for your design.
f-d
RE: At-Rest Pressure Coefficient (Ko) with Sloping Backfill