Performance of Multi-Helix Pile Embedded in Organic Soil Under Pull-out Load

Abstract

The performance of multi-helix plate piles under pull-out load in organic soils is tested through an experimental investigation on helical piles. On the basis of experimental tests, this study presents the feasibility of multi-helix pile behavior installed in organic soil. Tests were carried out on two different densities of organic soil. The helix piles were made of 16-mm-diameter mild steel shafts to which mild steel plates of 50 mm for both diameter and pitch were welded. Tests were performed on single-, double-, triple-, and quadruple-helix cylindrical screw piles with helix spacing to diameter ratios varying from 0.1 to 0.5. A set of tests was also performed to evaluate efficiency. The results of the tests are used to illustrate the difference in ultimate capacity for the different geometry anchors. The results showed that the helical pile behavior depends essentially on pile geometric characteristics and soil density. According to the achievements, pull-out load capacity of helical piles depends on spacing ratio (S/D) and number of plates.