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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Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.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 might I create a sub-surface ground movement curve from a surface ground movement curve, with movements proportioned linearly from the ground surface to the base of an excavation?

Warning: This answer provides methodology which should be used with careful engineering judgment.  It will result in calculations of soil movements below the ground surface merely as a proportion of those at the surface and is unlikely to be accurate in many situations. It is recommended that sub-surface curves are derived instead from field data or from finite element model results as discussed in the tutorial Guidance on how to create a sub-surface curve using 2D FE Analysis.


If, after careful consideration, it is thought valid to model sub-surface ground movements as a simple proportion of the surface movements, then the following steps may be taken to create sub-surface ground movement curves from surface ground movement curves.


(1) Copy the chosen surface movement curve to a new user-defined curve.


(2) Select the new curve in the Ground Movement Curves dialog’s droplist and set its type to “Surface and sub-surface movements” and its curve fitting method to “Linear interpolation”


(3) Add a series of points representing zero movement at full wall/excavation depth. This is most simply done by copying the existing surface points (by highlighting the range of points in the data table, then right-click “Copy”, then right-click “Paste” into the first blank field at the end of the table.


(4) Modify the new values in the second column (“Depth/wall depth or max. excavation depth (y)”) to “1” (or to another value which represents the depth at which you wish movements to converge to zero, and the new values in the third column (“Settlement/wall depth…” or “Horizontal movement/wall depth…”) to “0”

(5) … and “Apply” the changes.



(5) Review the graph



With reference to the warning above, note the difference between the graph of a typical sub-surface movement curve created in this way (above) and the graph of a sample sub-surface movement curve created by a finite element analysis with more detailed knowledge and specification of the soil stratigraphy (below). A sample of the latter is provided with the program. Its derivation is described in the help file (see section “Sample Sub-surface Ground Movement Curve”).  The comparison of these graphs shows that maximum movements may, in reality for some situations, occur below the ground surface, whereas the method described above will produce maximum movements at the ground surface.

Hence the need for caution when generating sub-surface movement curves using this generic method, and without more detailed data on which to base ground movement curves.

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