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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Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.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 can I model the excavation of a shaft in Xdisp?

There are two potential methods to model shafts in Xdisp. Both have limitations/drawbacks.

The first method is to define a shaft in the ‘embedded wall excavation’ function. An approximate shaft shape is defined in the excavation details tab. The user then specifies an appropriate relationship for surface and sub-surface ground movement. This could be based upon measured data, for example New and Bowers (1994), or from carrying out other analyses.

The alternative method is to specify a number of very short tunnel sections (say 1m length) stacked vertically on top of each other to the proposed depth of the shaft. The total volume of the tunnel sections should equal the total volume excavated for the shaft. Reasonably close matches have been achieved between measured settlement data from New and Bowers (1994) and the results from Xdisp. Generally a high k value and low volume loss has been used to achieve these correlations. No validation has been carried out to check whether sub-surface displacements or horizontal displacements are appropriate.


  1. New B. M. and Bowers K. H. (1994). Ground movement validation at the Heathrow Express Trial Tunnel, Proc. IMM Tunnelling ’94, Chapman and Hall, pp 301-327

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