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The improvement of soil undrained shear strength induced by installation of sand compaction pile (SCP), called set up effect, has observed in a number of field tests, but not been considered by the design code. Due to the lack of effective technical means, the numerical simulation of this problem mainly focused on single pile in the past studies. In this paper, a multi-stage Eulerian-Lagrangian (MSEL) technique is used to simulate the installation and consolidation process of double piles. Firstly, a centrifuge model test is used to benchmark this technique and reached a good agreement. Through the analysis of a single pile results, the strength growth curve conforming to the growth law is fitted. Finally, based on the results of single and double piles and considering the sheltering and accumulating effect, a method to predict the soil strength change after SCP group installation is proposed.

Large Deformation Numerical Simulation of the Set up Effect Induced by Sand Compaction Pile Group Installation