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Terms & Conditions

Contents

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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
  • understanding what our clients are interested in
  • understanding what potential clients are interested in
  • dealing with enquiries/concerns
  • marketing our services and people to you
  • market research
  • service development
  • internal record keeping

Marketing

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

Twelve months support and maintenance is included with most products. Thereafter maintenance is typically 20% of the current sales price.

An annual maintenance service is available for most programs after the first year.

This service includes:

  • telephone/fax/email/web based support
  • free software updates available via internet download
  • personalised output header for many products

The Copenhagen Metro Circle Line

Software Used on this Project

Project Overview

The Copenhagen Metro Circle Line consists of a 15.5km metro line with 17 underground stations. The stations were constructed as cut-&-cover structures using top-down construction technique and retained within a station box of either secant piles or diaphragm walls.

The design and construction of the tunnels and stations in soft ground conditions in an urban environment posed a number of geotechnical challenges, including the requirement to limit settlements and groundwater movement.

How Oasys proved invaluable

The construction of tunnels can induce ground movements at and below the ground surface. The stations and tunnels were to be constructed in close vicinity to existing buildings and structures. These included listed buildings that date back to the 16th century which are typically built on wooden piles. These can be affected even by minor changes in the in-situ ground conditions.

In such an urban environment, building protection measures, including monitoring, settlement control and the installation of mitigation measures, were critical to the station and tunnel works. An initial assessment of building damage had been undertaken at tender design stage to assess the damage to buildings along the line of the Cityringen.

The ground conditions were 10-15m of glacial deposits over fissured limestone that included hard layers of flint. Building protection measures meant that buildings within 100m of excavations not in limestone required risk assessments for damage from movement.

Analysis

The building risk assessment process was based on a staged approach. The sequential process identified the critical buildings along the alignment using the building and geotechnical information available at tender (Stage 1). This allowed a means of scoping the extent of required protection measures and allowed a cost estimate for building protection (Stage 2).

The main stages of the building risk assessment are outlined as follows:

Stage 1

For the Stage 1 assessment a settlement analysis was done to determine the ground movements above the entire alignment of the Cityringen. The settlement analysis was done using Oasys Xdisp.

The fundamental parameter that underlies all empirical methods of estimating tunnelling settlement is the volume loss. Volume loss can be defined as the ratio of the additional volume of excavated ground removed over the theoretical volume of the tunnel. Stage 1 comprised a screening process using the ‘worst credible’ volume loss. In this stage the effects of building foundation on the pattern of settlement were ignored. Oasys XDisp was used to calculate the settlements at the ground surface caused by the construction of the tunnels.

The screening comprised the identification of any structure where the predicted settlement from bored tunnels is less than 5 mm and the predicted slope is less than 1/500. These did not need be subject to further assessment. All other structures shall be subjected to a Stage 2 risk assessment.

Stage 2

For the Stage 2 assessment all the structures identified in Stage 1 and subject to settlements were assessed using a limiting tensile strain approach (Burland et al. 1977; Burland 1995; Mair et al. 1996; Burland and Boscardin and Cording 1989). This method took into account the tensile strains in the ground and used a simple idealised model of the building. The Stage 2 risk assessment assumed that the buildings followed the greenfield surface settlement profile calculated in Stage 1 and again was undertaken using the Oasys Xdisp programme.

The damage category of the building was determined in accordance with the limiting tensile strange ranges as shown below.

Xdisp was able to show how these specific structures performed in relation to the damage categories using building damage interaction charts as shown below.

Furthermore, the displacements along the sub-structure were plotted using Xdisp.

From the Stage 2 assessment a list of identified buildings with special concerns, or listed buildings with a damage category greater than 1 for ‘worst’ case volume loss, or a normal building with a damage category greater than 2, were compiled. At tender stage this list was used to identify buildings where building protection may be required, allowing a means of assessing the contractor’s proposed works during tender evaluation.

Controlling ground movements

In glacial deposits, and especially in zones with mixed faces, additional measures were required to keep the surface settlements at an acceptable level. Settlements caused by tunnelling were mitigated by:

  • Alignment optimisation
  • TBM design
  • TBM operational management
  • Monitoring and systematic early follow-up
  • Soil improvement, structural strengthening, compensation grouting, permeation grouting, freezing, temporary bracings etc, and
  • Construction of lateral and superior barriers (e.g. piling, pipe roofing etc) 

References

S. Eksesn, D. Whittles, J. Krogh and J. Gravgaard, The Copenhagen Metro Circle Line –Tunneling and Station Construction Challenges in Urban Conditions, presented at the Rapid Excavation and Tunneling Conference, San Francisco, California, June 2011

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