Abstract
Long-short composite pile is a widely used ground improvement technique. This study presents the results of finite difference analyzes using FLAC3D software to investigate the load-bearing and deformation behavior of long-short pile composite foundation under various load distributions. The pile-soil load-sharing ratio and stress ratio, axial force distribution in the piles, pile side friction resistance distribution, and settlement behavior are also studied. The results show that settlement is much more significantly affected by long-pile rather than short-pile. On the other hand, the load distribution between piles and subsoil is significantly affected by the cushion.
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