Project Data
FEMSoilCalc scope
A browser-based 2D plane-strain geotechnical FEM prototype: soil continuum mesh, Ko initial-stress assembly, duplicate wall/interface line, Euler-Bernoulli wall beam with rotations, incremental staged excavation carry-over, props, surcharges, groundwater, displacement contours, wall actions and Mohr-Coulomb mobilisation plots.
Geometry / Mesh
Domain is generated around a vertical wall at x=0. Excavation is on the positive x side. y is elevation.
Soil Materials
| # | ID | Name | γ kN/m³ | E' | ν' | φ' | c' | ψ | Ko | Del |
|---|
Current solver uses equivalent linear plane-strain stiffness and reports approximate Mohr-Coulomb mobilisation. Plastic correction is prototype/diagnostic.
Wall / Interface / Props
Props / Anchors
| # | Elev | k | Prestress | Active stage | Del |
|---|
Loads / Water
Surcharges
| # | Side | x from | x to | q | Stage | Del |
|---|
Construction Stages
| # | Name | Excavation elev | Water active | Water passive | Analyse | Del |
|---|
Each analysed stage deactivates excavation-side soil above the excavation elevation, activates props and surcharges by stage number, and carries the model envelope.
Summary
Wall Results
FEM Results
Theory / Limitations
Implemented formulation
- 2D plane strain CST triangular soil elements.
- Elastic continuum stiffness with body force from unit weight and Ko initial-stress equivalent nodal loads.
- Approximate Ko initial stress field assembled into active soil elements and mobilisation reporting.
- Wall represented by duplicate structural nodes with Euler-Bernoulli bending rotations, axial stiffness, interface penalties and prop/anchor springs.
- Incremental staged excavation with displacement/load carry-over and excavation-side soil deactivation above each stage level.
- Groundwater as hydrostatic pore pressure field used in effective-stress checks and equivalent lateral pressure.
- Strength-reduction diagnostic based on increasing mobilisation and solver conditioning.
Engineering caution
This is a serious prototype for comparison and verification workflows, not a replacement for PLAXIS/ADONIS/RS2. The first version is intentionally transparent: it exposes mesh, reactions, wall actions and mobilisation so errors are visible. Treat plasticity, interface slip and strength reduction as diagnostic approximations until benchmarked.