Based on Geddes’ stress formula

the hypotheses are designed aiming at the influence of annular flange rib of new prestressed pipe-pile with rib: The force of annular flange rib can be equivalent to the compaction to its lower part soil

i.e. additional stress; for the convenience of calculation

this kind of additional stress is simplified to the rectangular distribution skin friction resistance along double length of the lower part of annular flange rib; and the formula for calculating the settlement suitable for the single pile of new prestressed pipe-pile with rib is given; then Matlab software is used to program calculations. The calculated results are consistent with the experimental test results; so they can be used to estimate for the project.