I am currently working as the geo on a new development. I have given initial recommendations to undercut 6 feet of the underlying CH material. The CH has PI's up to 27, and I am approximating 1800 psf swell pressures. The owner and SE have pitched the use of rammed aggregate piers, and we shot that down due to the possibility of transferring the shrink/swell forces from the pier to the shallow footings. Our response recommendation was to do additional borings to a greater depth to entertain the idea of micropiles. Shot down due to cost ineffectiveness. Our last recommendation was to use a 3' undercut in conjunction with a monolithic slab on grade and grade beam scenario, hoping that the 3' will provide enough cushion from swell pressures. I would greatly appreciate it if anyone could weigh in with some ideas and or other concerns. Thanks in advance.
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.
Cities are ceaseless engines of engineering activity. Itâ€™s likely that while you were on your way to work, you encountered a number of infrastructure development projects under construction. Download Now
When was the last time you drove down the highway without seeing a commercial truck hauling goods?The ubiquity of these machines underscores the important roll they play in modern commerce. Download Now