ZSwalls 2018 is a 2D deep excavation – retaining wall analysis software program. The program is based on the finite element method including coupled formulation for fully- and partially saturated two-phase media and advanced constitutive laws. ZSwalls analyzes excavation sequences including intermediate stability checks.
In addition, ZSwalls v2018 offers:
- user-friendly graphical interface
- simplified overall input strategy
- automated and user-configured, ready to print reporting (see examples Tutorial 1 or Tutorial 2)
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
- 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 .
- time-dependent (consolidation) or steady-state analysis including partially-saturated effects in soil (soil water retention curve model by van Genuchten )
ZSwalls can alternatively be used as a template pre-preprocessor in ZSoil  in order to speed-up data generation.
 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.PC 100701, Zace Sevices Ltd, 2012.
 R. Obrzud, A. Truty, and K. Podles. Virtual lab. Technical Report ZSoil.PC 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.PC v2018, Soil, Rock and Structural Mechanics in dry or partially saturated media. ZACE Services Ltd, Software Engineering, Lausanne, Switzerland, 1985-2018.