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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Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.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


Slope – Why does applying a soil nail force as a surface load obtain a different Factor of Safety?

With the default option of unchecked “anchor force is applied as surface load” box (BS8006 calculation method)

  • For a given slip circle, Slope looks for the minimum anchor capacity based on pullout, tensile failure or stripping;
  • Resolves it parallel to the slip surface at the point at which the anchor crosses the slip surface in order to derive a simple restoring moment;
  • Adds this moment to the other restoring moment derived from slope stability theory to give a total restoring moment;

 With the “anchor force is applied as surface load” box checked

  • slope again calculates the minimum anchor capacity but applies it as a surface load;
  • This means that it is worked through the method of slices calc, ultimately resulting in an increased normal force on the failure surface, and hence a greater restoring moment by virtue of increased friction;
  • There is no explicit calculation of moment due to the reinforcement.

 This means that the surface load option will tend to obtain a higher factor of safety and the BS8006 calculation is acknowledged to be conservative.  In essence, the two solutions give the following results:

Default option:                MSu/F + Mn/F = Mw

Surface load option:        MSu/F +   Mn  = Mw

where Msu is soil restoring moment, Mw is soil disturbing moment, Mn is moment due to nail forces.

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