Lythos Settle

Foundations

Settlement of foundations and embankments

Boussinesq and 2:1 stress distribution, Steinbrenner and Schmertmann immediate settlement, primary consolidation and secondary compression, Terzaghi time–settlement and angular distortion checks.

$ pip install lythossettle

Run

lythos-settle

Default port

8780

Python

3.10+

Version

0.1.0

Licence

AGPL-3.0

See the examples →ReferenceSource ↗

Works out how much and how fast a rectangular, strip or circular foundation — or an embankment given by its crest width, height and slope angles — settles on a layered soil profile.

What it computes

1. Stresses — in-situ σ_v0, u₀, σ′_v0 and σ′_p; the stress increase beneath the foundation by Boussinesq (Newmark's rectangle, the strip and the circle solutions) or by the 2:1 spread, at the centre, the characteristic point, the middle of the long edge and the corner. Under an embankment, exactly for its trapezoidal load, at the crest centre, the crest edge, the middle of the slope and the toe.
2. Immediate settlement — layered elastic (Steinbrenner) in every layer, or Schmertmann (1978) in the granular layers.
3. Consolidation — primary settlement of the clay layers from C_c, C_r, e₀ and σ′_p, and secondary compression from C_α up to the design life.
4. Time — Terzaghi's one-dimensional consolidation, each clay layer draining on its own; t₅₀, t₉₀ and the time–settlement curve.
5. Checks — total settlement and angular distortion against their allowable values.

On top of it, a parametric or reliability study reports the probability of exceeding the allowable settlement or distortion, with a 95 % confidence interval and β.

Screenshots

Results summary

Time–settlement

Settlement with depth — dark theme, Turkish

Reliability study

Embankment on soft clay

Settlement across the embankment

Quick start

pip install lythossettle
lythos-settle                                  # interface: http://127.0.0.1:8780/

lythos-settle example -o project.settle        # starter project: a raft on soft clay
lythos-settle run project.settle -o report.pdf
lythos-settle study project.settle -o samples.csv

Figures

Section with the Boussinesq stress bulb · stresses with depth (σ′_v0, σ′_v0 + Δσ, σ′_p and the influence-depth criterion) · influence factors at each point with Schmertmann's I_z · cumulative settlement with depth · time–settlement curve · settlement components at each point · settlement across the section (the trough under a footing or a fill). Study figures: one-at-a-time sweep, histogram, scatter, tornado.

Next steps

• Examples — a raft, the choice of method, an embankment and a reliability study.
• Reference — inputs, expressions, modules.
• For the stability of a fill see Lythos LE; for bearing capacity, Lythos Bearing.