Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*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.

Students Click Here


Soil Properties

Soil Properties

Soil Properties

Why should compacted fill below a footing be at least two time as wide as the footing? Thanks!

RE: Soil Properties

Basic geotechnical engineering....influence of the footing is usually taken to a depth of 2B, with "B" being the footing width, and the influence taken at a 45 deg line from the footing edge downward.

RE: Soil Properties

I certainly, though, wouldn't dig out a couple of footing widths just to put in compacted engineered fill - unless it was required due to the natural ground not being suitable.

RE: Soil Properties

Absolutely you would. If the soil underlying the proposed foundation has insufficient strength or bearing properties that deems it unacceptable for supporting the foundation, it needs to be dug out and replaced with structural fill, that means you dig out as well as down (per above).

RE: Soil Properties

I hope that dBasement understood that I would not dig out good bearing soil just to put it on engineered fill. Of course, if the soil is poor, one could remove and replace. 2x might not be large enough for strip footings that normally have pressure bulbs to depths of 3.5 to 4x footing width. One might consider the use of digging out partially and using geogrids (see paper by Braja Das and Adel Hanna on Model tests for shallow strip foundation on granular soil in ASCE Special Publication No. 16, Special Topics in Foundations (1988).

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.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper – Data Security and Know-How Protection
Our data is constantly exposed to the danger of being intercepted or stolen as it wends its way over global data networks. Data security measures and measures for protecting intellectual property should not, however, first be implemented when data is exchanged – companies must lay the foundation for these measures within their own organization. Download Now
White Paper – Collaboration in the PLM Context
The influence exerted by the Internet of Things (IoT) means that there is a steadily growing need for collaboration in industry. Partners from new industries and areas of application need to be integrated in cross-company business processes to ensure that the lifecycle of smart, connected products can be managed from end to end. Download Now
White Paper – The Challenges of PLM Collaboration
There is cross-company collaboration - and then there is cross-company collaboration. Large-scale corporations and joint ventures need different mechanisms to protect intellectual property from those required for communication between different company locations with heterogeneous IT landscapes. 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:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close