Need a book? Engineering books recommendations...
Return to index: [Subject] [Thread] [Date] [Author]
Sliding factor of safety for retaining walls
[Subject Prev][Subject Next][Thread Prev][Thread Next]- To: seaoc(--nospam--at)seaoc.org
- Subject: Sliding factor of safety for retaining walls
- From: "Bill Sherman" <SHERMANWC(--nospam--at)cdm.com>
- Date: Wed, 3 Sep 1997 16:01:16 +0500
How do you calculate the sliding factor of safety for a retaining wall? For example, if you have an active sliding force due to soil of 2000 lb, a passive resisting soil force of 400 lb, and a frictional resistance of 2400 lb: Method 1: Net lateral force = active force - passive force = 2000 - 400 = 1600 lb. Factor of Safety (FS) = base friction / net lateral soil force = 2400 / 1600 = 1.50 Method 2: Total resisting force = base friction + passive soil force = 2400 + 400 = 2800 lb. FS = total resisting force / active sliding force = 2800 / 2000 = 1.40 Which number is correct? I've seen designs and guidelines done both ways. (Note: when passive soil resistance is neglected, the question goes away.) I've typically used Method 2 on the basis that the intent is to have a total resisting force greater than the force causing the tendency to slide. However, this would mean that a wall with equal soil height on both sides under at rest pressures doesn't meet stability criteria without adequate frictional resistance! Thus I am starting to lean in the direction of Method 1. (Note: this question also occurs when calculating safety factors for overturning - should a passive soil force be included in the numerator or denominator? The answer affects calculated factors of safety and resulting deigns.)
- Follow-Ups:
- Re: Sliding factor of safety for retaining walls
- From: Thomas Chiu
- Re: Sliding factor of safety for retaining walls and passive resistance
- From: Dave Anderson
- Re: Sliding factor of safety for retaining walls
- Prev by Subject: Re: slab on ground for expansive soil
- Next by Subject: Re: Sliding factor of safety for retaining walls
- Previous by thread: RE: masonry anchors
- Next by thread: Re: Sliding factor of safety for retaining walls
- About this archive
- Messages sorted by: [Subject][Thread][Author][Date]