The Efficiency of Belled Piles in Multi-Layers Soils Subjected to Axial Compression and Pullout Loads: Review

Multi-belled piles are with enlarged ends; these have one or further bells at the lower third part of pile. These suitable for many soils problems such as softening clay, variation groundwater table, expansive soils, black cotton soil, and loose sand. The current study reviewed behavior belled in multi-layer subjected to axial compression pullout loading. review covered experimental theoretical works on multi-layered soils. were static dynamic loadings cases. Most results focused software PLAXIS 3D. load applied comes from upper structure built above piles, negative skin friction groundwater. obtained previous studies showed validity using different types soil multilayer According studies, this aims find all things about including best shape pile being half cone worst state when bell is fully cone. number two because bearing capacity increases but does not exceed due hard work high cost. location a base that increased 40% 73.75% compared ordinary piles.