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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Superseded Versions of Terms and Conditions

Oasys keeps copies of all superseded versions of its terms and conditions.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 – Xdisp gives large displacements adjacent to the ends of the common side of two joined excavations, why?

When modelling complex composite excavations it should be borne in mind that Xdisp sums the displacements arising from all the individual excavations in a model and that either the sides of excavations or their corners can have an influence on displacements.

Consider the plan below, which illustrates 4 detached excavations.

The horizontal and vertical movements of position P4 will be calculated as the sum of the results calculated for each of the four excavations.

Ground movements at P4 are not only influenced by those sides of excavations from which a line can be subtended to the displacement point, but also from the corners of those excavations which do not have such a side, e.g. Excavation 1. It is those corner effects that are germane to this discussion.

How would the results for a large rectangular excavation be affected if it were modelled as two constituent excavations adjacent to each other, each representing half the plan area?

The contour plots below, showing sample vertical displacements, provide an illustration of such models. (All plots have the same contour intervals.)

(1) Single rectangular excavation of plan dimensions L x W, and depth D. Identical ground movement curves for all walls with no corner stiffening:
(2) Twin excavations each of plan dimension L/2 x W, and depth D, with identical ground movement curves assigned to all sides and no corner stiffening…
 (2.1)  …widely delatched:
(2.2)  …attached:
Note the increased displacements adjacent to the ends of the common side.
 (3) Twin excavations with dimensions as (2), but with no ground movement assigned to the walls that will form the attachment…
(3.1)   …widely delatched:
 (3.2)   …attached:
The increased displacements adjacent to the ends of the common side are reduced in area and magnitude, but still evident when compared to the results for the single excavation shown in (1).


The effect of Xdisp’s calculation of ground movements around corners is to produce higher ground movements adjacent to the junctions of the two excavations in both cases (2) and (3) above than along the sides. Such movements can be reduced by assigning ground movement curves with no movements to those sides of the excavations that form the attachment, but they cannot be eliminated. The plot in (1) cannot be obtained by placing two excavations adjacent to each other.

Thus care should be taken when interpreting results if complex composite excavations are created by specifying many excavations that are contiguous e.g. with the intention of representing a single excavation, perhaps with varying depths and/or re-entrant angles.

It is intended that Xdisp will address this shortcoming in a future version of the software, perhaps by allowing corner effects to be specified as on or off for each corner of an excavation.

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