The settlement of floating piles embedded in sandy soil can be estimated by using either Skempton's method or Meyerhof's method. Also, in case of a floating piles embedded in clay soil, the settlement of piles can be estimated using equivalent raft approach. The details about these methods can be referred from the text books named 'Pile design and construction practice' authored by Michael Tomlinson and John Woodward or text book named 'Pile foundation analysis and design' authored by Poulos H.G and Davis E.H. ok all the best..
Thank you for you answer or for the suggestion of all those valuable boobs and publications. I'm realy wondering about the method of estimation of the floating piles settlement installed in an heterogeneous soil.
If you look for a simple calculation and fast solution to do problem of pile group settlement it is very easy to use the equivalent pile foundation method where the pile group is either substituted with the equivalent caisson or slab foundation.
Actually, I'm looking for the most effective methods to estimate the bearing capacity and to predict the settlement of a group of floating piles installed in heterogeneous soils, I didn’t find any analytical publication treated this problem.
The bearing capacity of a floating pile group installed in heterogeneous soil conditions can be calculated by the summation of the skin friction mobilized in individual layer for the single pile. The group pile capacity is by assuming the group efficiency as 1, so, the capacity of a pile group is number of piles multiplied by single pile capacity. The most reliable method for pile group settlement is calculated by using pile load test results. The pile group embedded in layered clay soil is calculated based on consolidation test results using equivalent raft method. The methods mentioned above is an effective method for calculating bearing capacity and settlement of the pile. You could find out these details on capacity and settlement of the pile group in standard pile related text books as listed in my previous message..ok all the best..