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For Engineers · Excavation & Shoring

Excavation & Shoring for a stair stringer

Built for engineers using it for real design work. Go from concept to a running model in the browser, then scale to the cloud when needed. Simulate a stair stringer live below — adjust the inputs and watch it respond, right in your browser.

Retaining Wall

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Retaining Wall (Rankine)Live

earth pressure & stability

Controls

Presets

Wall height H (m)

Soil friction angle φ (°)

Soil unit weight γ (kN/m³)

Base width (m)

Rankine theory gives the active earth pressure behind a wall from the coefficient Ka = tan²(45−φ/2). The soil pushes with a triangular pressure resultant Pa acting at one-third the height. The wall must resist overturning and sliding with adequate factors of safety. Educational tool, not a geotechnical design.

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Data Inspector

Ka0.333

Active thrust Pa48.0 kN/m

FS overturning1.82

FS sliding0.81

Governing equation

K_{a} = tan^{2} (45 - \frac{φ}{2}) = 0.333, P_{a} = \frac{1}{2} K_{a} γ H^{2} = 48.0 kN/m

Reading this result: Sliding FS is 0.81, under the ~1.5 target — the wall could slide out. A wider base or a shear key would help.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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Groundwater

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Groundwater Well DrawdownLive

Thiem steady-state cone of depression

Controls

Presets

Pumping rate Q (m³/day)

Transmissivity T (m²/day)

Radius of influence R (m)

Pumping a well lowers the water table into a cone of depression. Under the Thiem steady-state solution the drawdown is s(r) = Q/(2πT)·ln(R/r): more pumping deepens the cone, higher transmissivity flattens it. Fundamental to well design, water supply, and contaminant capture.

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Data Inspector

Drawdown at well4.7 m

Drawdown at 50 m1.47 m

Radius of influence500 m

Governing equation

s (r) = \frac{Q}{2 π T} ln \frac{R}{r} = \frac{2000}{2 π \cdot 500} ln \frac{500}{r}

Reading this result: Drawdown is Q/(2πT)·ln(R/r): here it is about 4.7 m at the well and falls off logarithmically, so most of the depression sits in the first tens of metres.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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Frequently asked questions

Is this good for engineers?: Yes — this version of "Excavation & Shoring for a stair stringer" is framed for engineers using it for real design work. Go from concept to a running model in the browser, then scale to the cloud when needed.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.