Numerical Analysis of Helical Pile_Soil Interaction under Compressive Loads

[摘要] The results of the field tests of full-scale steel helical piles in clay soils intended for prefabricated temporary buildings foundations are presented in this article. The finite element modeling was used for the evaluation of stress distribution of the clay soil around helical piles. An approach of modeling of the screw-pile geometry has been proposed through the Finite Element Analysis. Steel helical piles with a length of 2.0 m, shaft diameter of 0.108 m and a blade diameter of 0.3 m were used in the experiments. The experiments have shown the efficiency of double-bladed helical piles in the clay soils compared to single-bladed piles. It has been experimentally established that the introduction of the second blade into the pile shaft provides an increase of the bearing capacity in clay soil up to 30% compared to a single-bladed helical pile with similar geometrical dimensions. The numerical results are compared with the measurements obtained by a large scale test and the bearing capacity has been estimated. It has been found that the model results fit the field results. For a double-bladed helical pile it was revealed that shear stresses upon pile loading are formed along the lateral surface forming a cylindrical failure surface.

[发布机构] Department of Foundations, Kuban State Agrarian University Named after I.T. Trubilin, Kalinina Str., 13, Krasnodar; 350044, Russia^1

[学科分类] 土木及结构工程学

[关键词] Compressive loads;Failure surface;Geometrical dimensions;Large scale tests;Lateral surface;Numerical results;Pile soil interaction;Shaft diameter