×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# cantilevered retaining wall - weight of soil wedge behind wall

## cantilevered retaining wall - weight of soil wedge behind wall

(OP)
Most (maybe all) the references I've seen for design of cantilevered retaining walls show the stabilizing effect of the weight of soil behind the wall based on a straight vertical extrusion of the heel width. E.g., if the heel width is 4 feet, the stabilizing weight of soil behind the wall is 4' x (wall height) x (soil unit weight). But the "failure plane" of the wedge of soil behind the wall, which is driving the overturning effect, is basically projected at some diagonal angle from the end of the heel (e.g., an angle alpha from the horizontal, where alpha = 45 + phi/2, projected from the end of the heel). My question is, if the active soil pressure is defined by this soil wedge, why wouldn't the stabilizing weight of soil also be derived from this wedge-shaped (and larger) geometry, rather than the straight vertical extrusion above the heel? It seems like the straight vertical extrusion significantly underestimates the potential stabilizing weight of soil behind the wall.

### RE: cantilevered retaining wall - weight of soil wedge behind wall

I think it is just to be conservative. For overturning to occur, you would also need a shear failure of the soil along the vertical or diagonal plane, and that is typically neglected as well.

DaveAtkins

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!