The designer computed an allowable load of about 43tons according to Bustamante & Doix, but I think it is reallly too high for a micropile of 11m, even in gravel.
Depending on different theories I get 15tons to 20 tons allowable load.
Anyway it is the 1st time I heard about Bustamante & Doix. Does anyone know something about it ? Is 43 tons consistent with micropiles ?