Practical Method for Piled Raft Consolidation Settlement Calculation

Abstract:

A practical method for calculating the consolidation settlement of frictional piled raft foundation in deep clay was presented. Nonlinear model considering pilesoilraft interaction and alternating direction implicit finite difference algorithm were adopted to solve excess pore water pressures at different positions in twodimensional plain strain domain, average consolidation degree of soil below pile tip and consolidation settlement of piled raft in any time. The results from comparison with the accurate solution of finite element method show that the proposed model and the simplified assumptions are basically reasonable. Finally the method was successfully applied to the consolidation settlement prediction of two pile raft cases in saturated clay.

Key words:piled raft; consolidation; settlement calculation; nonlinearity; implicit finite difference algorithm