The Efficiency of Belled Piles in Multi-Layers Soils Subjected to Axial Compression and Pullout Loads: Review. jcoeng [Internet]. 2023 Sep. 1 [cited 2025 Mar. 14];29(09):166-83. Available from: https://joe.uobaghdad.edu.iq/index.php/main/article/view/1739