ZSwalls features

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
  • simplifi ed overall input strategy
  • automated and user-confi gured, 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 fi nite 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 [3] 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 [1].
  •  time-dependent (consolidation) or steady-state analysis including partially-saturated effects in soil (soil water retention curve model by van Genuchten [7])

Main screen of the application

ZSwalls can alternatively be used as a template pre-preprocessor in ZSoil [8] in order to speed-up data generation.

ZSwalls requirements:

  • Processor : i5, i7 or Intel XEON; AMD not supported
  • System 64 bit: Windows: Windows 7 ,Windows 8 or 10
  • Update for Universal C Runtime in Windows is required for Windows Server 2012 R2, Windows 8.1, Windows RT 8.1, Windows Server 2012, Windows 8, Windows RT, Windows Server 2008 R2 Service Pack 1 (SP1), Windows 7 SP1, Windows Server 2008 Service Pack 2 (SP2), Windows Vista SP2 (see: https://support.microsoft.com/en-us/help/2999226/update-for-universal-c-runtime-in-windows)
  • RAM : 8-16GB of RAM recommended
  • Hard-disk space : 50 GB
  • Graphical resolution : higher than 1280 x 1024 (1024 x 768 supported)

References:
[1] T. Benz. Small-strain stiffness of soils and its numerical consequences. Phd, Universitat Sttutgart, 2007.
[2] F. Kulhawy and P. Mayne. Manual on estimating soil properties for foundation design. Technical report, Electric Power Research Institute (EPRI), 1980
[3] R. Obrzud and A. Truty. The hardening soil model – a practical guidebook. Technical Report Technical report ZSoil.PC 100701, Zace Sevices Ltd, 2012.
[4] R. Obrzud, A. Truty, and K. Podles. Virtual lab. Technical Report ZSoil.PC 120201, Zace Sevices Ltd, 2016.
[5] T. Schanz. Zur modellierung des mechanischen verhaltens von reibungsmaterialien. Mitt. Inst. für Geotechnik, Universitat Stuttgart, 1998, 45, 1998.
[6] T. Schanz, P. Vermeer, and P. Bonier, editors. Formulation and verification of the Hardening Soil model. Beyond 2000 in Computational Geotechnics. Balkema, Rotterdam, 1999.
[7] M. van Genuchten. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Sci. Soc. Am. J, 44:892–898, 1980.
[8] 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.