Referring to the question and answer about Rinter (https://communities.bentley.com/products/geotech-analysis/f/plaxis-soilvision-forum/212033/rinter-value)
We typically do not recommend parameter values as this should be based on data collected from your investigation, laboratory data, engineering experience and judgment.
What kind of investigation or laboratory tests are most commonly carried out to obtain Rinter values?
On a very (very) rough estimation, considering interaction with sand and concrete values of Rinter between 0.8-1.0 can be used, and with clay with concrete values between 0.7-1.0. However, it is very difficult to say exactly what value would best fit your analysis.
Are there any literatures or publications that help us to roughly determine Rinter values?
Dear Yohei,
There are for instance guidelines for the friction angle of interaction as function of the internal friction angle and the type of structure (concrete, steel SPW, etc) for non-cohesive soils. Several (inter)national building codes prescribe using those guidelines. If one knows the friction angle of the soil and, according to the guideline, the friction angle of interaction, the value of Rinter can be derived at least for non-cohesive soils.
With kind regards,
Dennis Waterman