Helix spacing to diameter ratio (S/D) is one of the determinant factors in the designation of helical piles failure mechanism and, consequently, the bearing capacity. In typical helical piles, where the helix diameter is not variable, determining the S/D ratio is not challenging. However, in conical (tapered) helical piles, it is a source of doubt. Although there are some suggestions in this regard, for instance, using an average of helix diameters in the calculation, this issue is not clear and well-documented.
The optimal inter-helix spacing ratio (Sop/Dh) ranges from 1.5 to 5. But the influence zone of the helix is also related to the soil type and surrounding soil stress level. Thus, the optimal inter-helix spacing ratio under different soil conditions and pile geometric parameters varies accordingly.
Good afternoon. My research concerns injection piles and anchors when the wells are expanded by internal cement pressure.
For steel spiral piles, I think that soil compaction occurs between the blades and does not spread beyond them
- Badges
- Science method