Soil creep in marine soil deposits
Soil creep in marine soil deposits
(OP)
I have a site with very soft marine soil deposits (mainly silts) overlying and inclined bedrock. Soils just underneath the former seabed are normally consolidated, and soils on top of the bedrock are slightly overconsolidated (OCR=1.4). The thickest layer for these marine soil deposits is about 40 m. The site was land reclaimed. How can I check if soil creep is occuring/can occur? Soil creep is not "fully" understood, so if you also have good references to share with me, it will be appreciated.





RE: Soil creep in marine soil deposits
I believe creep is caused by the anisotripic freezing of neighboring soil particles, one of these directions being lateral, causing the particles to 'move over', and then drop once they settle out from a freeze, usually in the case of a sloped surface. Other signs are tilted retaining walls or mass wasting at the base. I would imagine just an almanac ccould tell you about the temperature year-round so you can get a sense of how long a freeze had time to set in. Does that help?
RE: Soil creep in marine soil deposits
RE: Soil creep in marine soil deposits
f-d
ípapß gordo ainÆt no madre flaca!
RE: Soil creep in marine soil deposits
RE: Soil creep in marine soil deposits
just to be clear, I don't use the term secondary consolidation. To me, consolidation requires the development and relief of excess pore pressure. Compression (elastic and secondary) are independent of pore pressure.
If you have normally-consolidated soils where the liquid limit is at or close to the natural water content, I'd consider secondary compression and look at that accordingly.
f-d
ípapß gordo ainÆt no madre flaca!
RE: Soil creep in marine soil deposits
RE: Soil creep in marine soil deposits
So, in other terms, do I need primary consolidation to occur first in order to produce secondary compression?
RE: Soil creep in marine soil deposits
So, yes, whether organic or not, my program at our state DOT would require the presentation of C-sub-alpha for fine-grained soils as determined from consolidation testing. Then we have a basis to know whether it's a problem or not a problem.
In a depositional environment such as the ocean bottom, yes, there is some continuing secondary compression. We don't (likely) quantify it, however. Intellectually though, these sediments are on some geologic journey to become shale.
f-d
ípapß gordo ainÆt no madre flaca!
RE: Soil creep in marine soil deposits