×
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.

# How do you do the slope stability analysis?

## How do you do the slope stability analysis?

(OP)
I would like to check how people do the slope stability analysis for these two cases using slope stability programs, WHEN THERE IS WATER TABLE(if there any consensus). Do you assume the following, if not what do you use?
1-Total stress analysis: Use total strength parameters ( cohesion,friction), NO water table is included in the analysis.
2-Effective stress analysis:Use total unit weight, effective cohesion, effective friction angle, INCLUDE the water table in the analysis.
Thanks.

### RE: How do you do the slope stability analysis?

If you have an undrained condition and a cohesive soil, I would use a total stress concept as you described. For a drained analysis -effective stress, I would use the bouyant weight and generally the phi valuefor strength. Cphesion under a drained condition is not always well defined. I was taught never to use combined phi -c strength as these change with time and drainage and are very hard to corralete to actual field conditions.

### RE: How do you do the slope stability analysis?

I'd do both.

f-d

¡papá gordo ain't no madre flaca!

### RE: How do you do the slope stability analysis?

If the soil is drained, I would use the moist unit weight above the water table and a saturated unit weight below the water table.  The computer program will probably subtract the weight of water when looking below the water table.  If not, then yes, use the buoyant weight below the water table.  Check the program manual.

### RE: How do you do the slope stability analysis?

As far as I know, most common slope stability software  will handle effective vs. normal stress based on position of the phreatic surface (for drained analyses).

#### 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.

#### Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a partâ€™s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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!