ZSwalls™ 2023 (diaphragm/sheet pile/soldier pile walls) is a standalone application to analyze excavations protected by diaphragm, sheet pile or soldier pile walls, based on the ZSOIL 3D  FEM software.
ZSwalls™ 2023 is based on the finite element method including coupled formulation for fully- and partially saturated two-phase media and advanced constitutive laws. ZSwalls™ 2023 analyzes excavation sequences including intermediate stability checks and thermal expansion checks.
In addition, ZSwalls v2023 offers:
- user-friendly graphical interface
- simplified overall input strategy
- automated and user-configured, ready to print reporting (see examples Tutorial 1 or Tutorial 2)
Start application screen for diaphragm/sheet pile walls mode
Start application screen for soldier pile walls mode
ZSwalls™ offers a variety of support elements which can be associated with different, typically applied excavation methods by:
- retaining walls – diaphragm or sheet pile walls
- tiebacks – anchors, nails
- internal bracing – struts
- top/down technique – slabs
ZSwalls™ offers the following features:
- fast pre-processing of rectangular-shaped excavations based on the automated finite element mesh generation including locking-free finite elements and an advanced mesh tying technique
- modeling of pile sheet and diaphragms wall and reinforcement elements such as anchors, struts and nails
- modeling Soldier Piles (RC piles, full or partial length piles with embedded steel profiles, or steel profiles), lagging material (wood, concrete or any other), anchors, micropiles (as anchors with a very short free length), and struts
- accounting for surface loads
- advanced elasto-plastic constitutive model for soils, i.e. the Hardening-Soil model [5, 6], which is commonly recognized and accepted by the geotechnical community (refer to  for comprehensive descriptions on theory, parameter selection and examples of case studies). The model is extended to account for small-strain stiffness which is observed in natural soils .
- fully coupled (consolidation) or weakly coupled steady-state analyses including the effects of partial saturation in soil (soil water retention curve model by van Genuchten ) -for the theory, refer to .
- intermediate stability checks based on incremental tan φ – c reduction algorithm
ZSwalls™ can alternatively be used as a template pre-preprocessor in ZSoil®  in order to speed-up data generation.
- Processor : i5, i7, i9 or Intel XEON; AMD not supported
- System 64 bit: Windows: Windows 10 or 11
- RAM : 8-16GB of RAM recommended
- Hard-disk space : 50 GB
- Graphical resolution : higher than 1280 x 1024 (1024 x 768 supported)
 T. Benz. Small-strain stiffness of soils and its numerical consequences. Phd, Universitat Sttutgart, 2007.
 F. Kulhawy and P. Mayne. Manual on estimating soil properties for foundation design. Technical report, Electric Power Research Institute (EPRI), 1980
 R. Obrzud and A. Truty. The hardening soil model – a practical guidebook. Technical Report Technical report ZSoil 100701, Zace Sevices Ltd, 2012.
 R. Obrzud, A. Truty, and K. Podles. Virtual lab. Technical Report ZSoil 120201, Zace Sevices Ltd, 2016.
 T. Schanz. Zur modellierung des mechanischen verhaltens von reibungsmaterialien. Mitt. Inst. für Geotechnik, Universitat Stuttgart, 1998, 45, 1998.
 T. Schanz, P. Vermeer, and P. Bonier, editors. Formulation and verification of the Hardening Soil model. Beyond 2000 in Computational Geotechnics. Balkema, Rotterdam, 1999.
 M. van Genuchten. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Sci. Soc. Am. J, 44:892–898, 1980.
 ZSoil. User manual ZSoil v2018, Soil, Rock and Structural Mechanics in dry or partially saturated media. ZACE Services Ltd, Software Engineering, Lausanne, Switzerland, 1985-2018.