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Privacy and Cookies

Data Security

Website Terms and Conditions

Software Licensing Terms

Privacy and Cookies

We may change this privacy notice from time to time by updating this page.

What information do we collect?

When you use this website, we may collect the following information:

  • the areas of the website that you visit
  • information about your computer, such as which browser you are using, your network location, the type of connection you are using (e.g. broadband, ADSL etc) and your IP address

We do this by using cookies, which are small files that help us track how our visitors use the website and enable us to understand where we can improve your experience. If you would like to find out which cookies we use and the information they track see our Cookies Policy.

Once you submit or register information through our website we will know who you are and your activities on this website and information about you and/or your company may be recorded on our systems. For example, we may ask for personal information when you download our software including:

  • your name
  • company name
  • email address
  • postal address
  • telephone number
  • country where you are based
  • Social media ID
  • your comments/questions
  • services/markets you are interested in

We may also collect personal information from telephone calls and/or other correspondence with you.

What do we do with the information we collect?

The information we capture is used for various purposes. The main purpose is to provide you with our services (whether available via the website or offline). We also use the information for:

  • website development
  • understanding how our visitors interact on the website
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  • understanding what potential clients are interested in
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  • marketing our services and people to you
  • market research
  • service development
  • internal record keeping


We would like to provide you with information about our services and other information which we think you may find interesting. We may send you such information by post, email and/or telephone, unless you have asked us not to do so.

We will not provide your personal information to other organisations for marketing purposes without your explicit consent.

If at any time you do not want your information used for direct marketing purposes, please contact us or follow the unsubscribe link in our marketing email messages.

Who do we share this information with?

We may share your personal information with companies acting on our behalf who will only use the information to provide that service. However, we will retain control of your data and any third party service provider that we use must act in accordance with our instructions. We may also share your personal information with a purchaser or potential purchaser of our business.

In some circumstances, we may have to disclose your personal information by law, because a court or the police or other law enforcement agency has asked us for it.

How to get copies of or amend the information we have collected

You may request details of the personal information that we hold about you under data protection laws. If you would like a copy of the information held about you please write to us at oasys@arup.com or at: Data Protection Officer, 13 Fitzroy Street, London, UK, W1T 4BQ. Please note that we may charge a small £10 administration fee for information requests.

If you think any information we have about you is incorrect or incomplete, please email us as soon as possible. We will correct or update any information as soon as we can.

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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, including locked cabinets, electronic password protection and pass card access to buildings.

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.

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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

Assessing the Influence of Soil Nail Parameters on the Stability of a Slope

Software Used on this Project

Project Overview

Indian Institute of Technology (IIT), Bombay, have used Oasys Slope to carry out a study on the influence of soil nail parameters on the stability of slopes. This study was presented at Geocongress ASCE, Oakland, and is due to be published in the Ground Improvement Journal.

In the paper, the authors noted the following:
“The limit equilibrium modelling software Oasys Slope was used for analysing the slopes with and without soil-nails. It is user-friendly as well as time efficient and can be used for analysis of slopes with and without Nails, Geotextile, Rock bolt and Ground anchors. For soil-nailed slopes, it allows the user to feed capacity of nail head (slope facing) as a plate capacity. It also considers the saturated as well as unsaturated unit weights of the soil. It enables the user to analyse slopes with difficult terrain for a different variety of geotechnical projects, individual cross-sections and different calculation methods.”

IIT have purchased the special Unipac license for teaching and research purposes.

A summary of the analysis and results are outlined below.

How Oasys proved invaluable

A parametric study was carried out by varying the nail parameters, including nail inclination, nail length etc. and slope geometry.
To perform the stability analysis, basic input parameters required for Oasys Slope were:
•    Failure criteria
•    Material strength parameters including soil, nail and facing
•    Factor of safety for materials
•    Position of phreatic  surfaces
•    Selection of approximate centre and radius of the slope circle
In the study, the Mohr-Coulomb failure criteria was selected for the stability analysis i.e. circular failure surfaces were selected. The input soil properties are unit weight of the soil, both in saturated and unsaturated conditions, cohesion and internal angle of friction of the soil. Slope stability analysis was performed with and without phreatic surface. For selection of the slip circle, it was assumed the slip circle should pass through the toe of the slope and no portion of slip circle should pass through the base layer of the slope.
Influence of nail layout on the FOS of soil-nailed slope (5V:1H) 

Influence of facing thickness on the factor of safety of soil-nailed slopes

Variation of FOD with and without phreatic surface (tf = 87mm)

Factor of Safety (FOS) for various nail inclinations, nail layouts, slope facing thicknesses and phreatic surface locations were calculated. These results were compared to determine the influence of nail inclination, nail layout, thickness of slope facing and phreatic surfaces on the stability of soil-nailed slopes. Influence of all these parameters were studied and discussed. 

Summary of results
Stability analysis was performed to study the effect of slope geometry, nail parameters and effect of rising water surface within the slope on the overall stability of soil-nailed slopes.
The study shows that with horizontal back slopes, the optimal nail inclination increases when the angle of the retained slope decreases. When the back slope increases the optimal soil nail also increases.
Two nail length patterns were studied:
•    Pattern 1, nail length decreasing with depth of the slope
•    Pattern 2, nail length increasing with depth of the slope
Pattern 1 was found to be effective for a 10.2 m high slope whereas Pattern 2 is found to be effective for 7.2 m high slope.
Rising water surface within the slope, increase in horizontal spacing and decrease in length of the nail reduce the overall stability of a soil-nailed slope.
Contribution of nails to the overall stability of soil-nailed slopes is dependent on their location and inclination with respect to the slip surface.

Link to paper:
Professor B.V.S. Viswanadham, Indian Institute of Technology, Bombay

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