SlipSurface Wall

Retaining structures

Cantilever retaining wall design

Earth pressure by four methods, sliding, overturning, bearing and global stability; earthquake by TBDY 2018; TS 500 reinforced concrete design, the reinforcement drawing, DXF and bar schedule.

$ pip install slipsurface-wall

Run

slipsurface-wall

Default port

8785

Python

3.10+

Version

0.1.0

Licence

AGPL-3.0

See the examples →ReferenceSource ↗

An inverted-T cantilever reinforced concrete retaining wall — a stem, a footing with a toe and a heel, an optional shear key, the backfill behind it and the foundation soil under it — is analysed, checked and designed down to the bars, with the reinforcement drawing and the bar bending schedule at the end.

What it computes

1. Earth pressure, by every method — Rankine (sloping backfill, cohesion), Coulomb (wall friction δ), at rest (Jáky / EN 1997-1, with OCR and slope) and a numerical trial wedge, on the virtual back through the heel, side by side. Passive resistance in front by Rankine or Coulomb; water behind and in front, uplift, surcharges, loads at the top of the stem.
2. Stability — sliding (base friction, adhesion, passive, shear key), overturning about the toe, eccentricity, the contact pressure under the base and an allowable soil pressure.
3. Bearing capacity under Meyerhof's effective width B′ = B − 2e by Terzaghi, Meyerhof, Brinch Hansen, Vesić and EN 1997-1 side by side — the factors of SlipSurface Bearing.
4. Global stability — slip circles under the wall by Bishop's simplified and Fellenius' methods, static and seismic.
5. Earthquake by TBDY 2018 — the site coefficients F_s, F₁, S_DS, S_D1, the design spectrum, k_h = β_r·0.4·S_DS and k_v up and down; the dynamic thrust by Mononobe–Okabe, Seed–Whitman or Wood; the inertia of the wall and of the soil on its heel.
6. Reinforced concrete by TS 500 — the TS 500 and TBDY 2018 load combinations; moment and shear of the stem, toe, heel and key; the steel, ρ_min/ρ_max, V_cr, bars and spacing, distribution steel, curtailment of half the stem bars, development lengths.
7. Drawing and schedule — the reinforcement drawing as a figure and as an AutoCAD DXF; the bar bending schedule; concrete and steel quantities.
8. The heel the wall needs — the shortest heel that satisfies every stability check, static and seismic; and Suggest dimensions for a first guess from H.

Screenshots

Results summary

Member design and the drawing

Earthquake — dark theme, Turkish

Reinforcement drawing

Bar bending schedule

Stem: moment, shear and capacity

Global stability

Reinforcement drawing — dark theme, Turkish

Quick start

pip install slipsurface-wall
slipsurface-wall                                   # interface: http://127.0.0.1:8785/

Enter the geometry, loads, soils, water, earthquake and concrete, and press Analyse and design. Results appear under Summary, Stability, Reinforcement, Results and Figures. Export report… in the header writes PDF, HTML or Word; Drawing (DXF) downloads the reinforcement drawing.

The same from the command line:

slipsurface-wall example -o project.lwall          # a starter project
slipsurface-wall run project.lwall -o report.pdf --dxf wall.dxf

Figures

Section to scale with the soils, water, surcharges, the virtual back, the forces and the base pressure · the pressures on the virtual back · earth pressure by method · every stability check as a margin, static and seismic · bearing capacity by method · the critical slip circle · the stem's moment and shear with the capacity of its bars · the base pressure and the toe and heel moments per combination · the reinforcement drawing · the bar bending schedule · the TBDY 2018 design spectrum.

Next steps

• Examples — the starter wall, an earthquake, a shear key and a longer heel, the drawing and DXF.
• Reference — the methods, inputs, modules and limits.
• For a reinforced soil wall use SlipSurface MSEW; for a sheet pile wall, SlipSurface SPWA.