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Data Security

Website Terms and Conditions

Software Licensing Terms

Data Security

We are committed to ensuring that your information is secure. In order to prevent unauthorised access or disclosure we have put in place suitable physical, electronic and managerial procedures to safeguard and secure the information we collect.

All data is stored in secure electronic systems accessible only to Oasys staff with both valid network login credentials and specific authorisation to access the system.  Our systems further limit data access by role to ensure data is available only to those who have a specific need to see it.

If at any point you suspect or receive a suspicious communication from someone suggesting they work for Oasys or a website claiming to be affiliated with Oasys, please forward the communication to us or report the incident by email to oasys@arup.com or in writing to Oasys, 13 Fitzroy Street, London, UK, W1T 4BQ as soon as possible.

Data Security Notice Updated 27th February 2020

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Website Terms and Conditions

The contents of this web site are protected by copyright and other intellectual property rights under international conventions. No copying of any words, images, graphic representations or other information contained in this web site is permitted without the prior written permission of the webmaster for this site.

Oasys accepts no responsibility for the content of any external site that links to or from this site.

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Software Licensing Terms

Terms and Conditions of Purchase

The full conditions of purchase and maintenance for all Oasys software are set out in the Oasys Software Licence and Support Agreement. All prices are subject to TAX at the current rate.

Prices and specifications are subject to change without notice – please ask for a written quotation.

Although every care has been taken to ensure the accuracy of all information contained herein, the contents do not form or constitute a representation, warranty, or part of any contract.

Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.

Maintenance & Support Services

Support and maintenance is included with all subscription licences for their full duration.

Annual maintenance contracts are available for software under a perpetual licence, prices are based on a percentage of the most recent list price.

This service includes:

  • telephone/fax/email/web based support
  • free software updates available via internet download
  • personalised output header for many products


Xdisp – How should I create a set of sub-surface ground movement data to describe the movement around a retained cut or embedded wall excavation?

Xdisp includes a facility to define or calculate sub-surface displacements around retained cuts. The most appropriate use of the program is by users carrying out site specific analysis of a 2 dimensional plane strain cross section of the retained cut excavation and to cut and paste the results directly into Xdisps Ground Movement Curves’ data. Commonly this will be carried out using a finite element analysis. The user is required to enter data from the analysis in the format defined below.

Xdisp then fits a curve to this data by a least squares fit to find a 2D (surface) polynomial function. The program then uses that function to interpolate between input data points to allow displacements to be calculated at any point behind the retaining wall. The program displays the R2 coefficient that indicates the goodness of fit to the actual data in both the x and y directions.

As an example of sub-surface displacements, data is supplied in a sample file with Xdisp. If a typical installation has been performed, then that file will be found at:

C:\Program Files\Oasys\Xdisp xxx\Samples\Sample sub-surface ground movement data.xdd

(where “xxx” is the version of the program).


That data has been obtained from a finite element analysis. Details of the FE model are given in the attachment (Appendix A). Comparisons of the data calculated from the model with sub surface displacements of a deep cast iron tunnel adjacent to the excavation may be found in Devriendt et al (2010).


  1. Devriendt M, Doughty L, Morrison P, Pillai A (2010). Displacement of cast iron tunnels arising from a deep basement excavation in central London. Accepted for publication in ICE Geotechnical Engineering journal 2010 Geotechnics of tunnelling special issue.

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