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Data Security

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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Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.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 -Displacement results around unstiffened corners of excavations differ between Xdisp 19.4 Build 5 and 19.4 Build 6. Why?

Consider the corner of an excavation whose adjoining walls have different stiffnesses. Wall A is stiffer than Wall B.


The horizontal component of surface ground movement alongside Wall A is 10mm towards the excavation. The same movement alongside Wall B is 100mm towards the excavation. The area in the arc of the corner, shown grey in the plan below, experiences horizontal movements influenced by Walls A and B. What are the directions and magnitudes of those horizonal movements? CIRIA C580 gives no guidance. Xdisp 19.4 Build 6 uses a different approach to that of 19.4 Build 5.

Plan of Corner of Excavation

Xdisp 19.4 Build 5

Xdisp 19.4 Build 6

Plan Plan
 Magnitude (of horizontal displacement)  Magnitude (of horizontal displacement)







Direction (of horizontal displacement)  Direction (of horizontal displacement)


The output from Xdisp shown below illustrates the differences in the resulting horizontal displacements around such corners for both methods.  In this example the north and west walls are stiffer than the south and east.



Xdisp 19.4 Build 5

Xdisp 19.4 Build 6

Horizontal X Displacements  Horizontal X Displacements
Horizontal Y Displacements  Horizontal Y Displacements
Vertical Z Displacements (no difference)  Vertical Z Displacements (no difference)
 Horizontal Displacements  Horizontal Displacements
 Resultant Displacements  Resultant Displacements



Note the discrete bulbs of movement around the south-west corner (for horizontal X displacements) and the north-east corner (for horizontal Y displacements) shown in the results from Xdisp 19.4 Build 5.  These are the result of horizontal movements due to the less stiff walls influencing the results in the area of the corner. They do not occur in the revised method used in Xdisp 19.4 Build 6.

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