Gravel compaction

[karode]

I have the following generic question.
If the sub-grade in particular area is 43kPa and on top is installed compacted 150mm thick of 25mm crushed gravel, how much will increase the overal bearing capasity in that area?
Thanks

 

[Ron]

Not much. The shear strength of compacted gravel (unless it is signficantly confined) is not so much greater than the subgrade, so there would still be a "punching" effect under high loads.

 

[karode]

Thank you for the response. How I can calculate it, what is the fomula that I can use in this case?

 

[csd72]

Sounds like you need to get your hands on a good design manual for roads or industrial floors, either should have some good information on this type of thing.