Leda Clay
Leda Clay
(OP)
What exactly is Leda Clay and how does one deal with it? Someone asked me recently and after searching the web I discovered that it appears to have a low remoulded strength and will liquify if touched.
It it normally removed, avoided or strengthened. This is a general interest question.
Thnaks
newbuilder
It it normally removed, avoided or strengthened. This is a general interest question.
Thnaks
newbuilder





RE: Leda Clay
Because of the structure of the clay, in which upon disturbance it will loss its strength, lanslides occur in the areas which have this type of clay. There are lots of technical articles which were written over the years in Canadian Geotechnical Journals. Famous Canadian landslide failures, such as in Breckenridge Creek, Rockcliffe on Ottawa River, Orleans in Ontario, St. Jean - Vinney, toulnustouc river in Quebec, etc were associated with this type of soft clay.
You will see that highway cut or embankments in these areas have been cut or constructed with very flat slopes, such as 6H:1V of flatter. This is because in long term stability analysis, the remolded strength will govern, as the structure of the original clay will breakdown from disturbance, groundwater flow, loadings, etc.
Hope that this will give some insight about Leda clay.
RE: Leda Clay
RE: Leda Clay
An electronic cone test might be more economical and would also show the difference in peak and remolded strengths.
Comparing the interpreted soil strength values to those of the friction sleeve will provide a good estimate of the sensitivity.
I would not recomend SPT testing for these types of soils as you will require a level of accuracy that the SPT can not provide.
Best of luck
Coneboy
RE: Leda Clay
I am thinking of building a house on a lot of 3 acres. Only 0.75 acres (flat part of lot) has been designated by an engineer as buildable because most of the 3 acres is leda clay. Is it safe to build a house on leda clay even in flat areas? Thank you.
RE: Leda Clay
RE: Leda Clay