Skip to main content Accessibility help
×
Home
Hostname: page-component-559fc8cf4f-q7jt5 Total loading time: 0.2 Render date: 2021-02-24T23:26:17.493Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": false, "newCiteModal": false, "newCitedByModal": true }

The Development of Sprayed Backfill Technology

Published online by Cambridge University Press:  15 February 2011

Pacovsky Jaroslav
Affiliation:
Centre of Experimental Geotechnics, Faculty of Civil Engineering, Czech Technical University Thakurova 7, 166 29 Prague 6, Czech Republic
Svoboda Jiří
Affiliation:
Centre of Experimental Geotechnics, Faculty of Civil Engineering, Czech Technical University Thakurova 7, 166 29 Prague 6, Czech Republic
Št'ástka Jiří
Affiliation:
Centre of Experimental Geotechnics, Faculty of Civil Engineering, Czech Technical University Thakurova 7, 166 29 Prague 6, Czech Republic
Get access

Abstract

The Centre of Experimental Geotechnics, CTU in Prague has recently launched a sprayed backfill technology development programme. Such technology will, most probably, be used during the future construction of deep underground radioactive waste repositories.

The safe disposal of radioactive waste in deep underground geological repositories assumes the construction of a multi-barrier system the aim of which will be to eliminate the potential penetration of hazardous radionuclides into the biosphere over a time span of several hundred thousand years.

With regard to the location in the repository in which the containers will be placed, bentonite will seal the space between the container and the rock mass in the form of a highly compacted bentonite block, while access galleries to the nests will be backfilled with a mixture of natural bentonite and rock. This mixture will be compacted in layers using compacting machinery thus ensuring maximum backfill density during compaction. Following compaction, however, spaces will remain in the gallery vault to which such compacting machines will be unable to gain access. Sprayed clay (sprayed backfill) technology, however, will allow the filling of such voids by injecting backfill so that the material compaction level obtained using this method is at least the same as the backfill compaction level resulting from that using standard compacting machinery (vibration roller, vibration plate compactor etc.).

Sprayed backfill technology is based on shotcrete technology which is a method commonly applied today in the construction of underground structures. Sprayed backfill technology development may involve the use of concrete spraying machines; however the parameter requirements for the spraying of bentonite backfill differ in principal from those which apply to shotcrete.

The article will provide information on the development of sprayed backfill technology, the machinery employed and the sprayed material as well as research results obtained to date.

Type
Research Article
Copyright
Copyright © Materials Research Society 2009

Access options

Get access to the full version of this content by using one of the access options below.

References

1 Dixon, D., Concept and Technologies for Backfilling a Nuclear Fuel Waste Repository. AECL, report No: 06819-REP-01200-10103-R00, 2003.Google Scholar
2 Kobayashi, I., Terada, K., & Nonaka, K., Development of Construction Methods of the Bentonite Engineered Barrier by the High/Density Shotclay System. Proc. of the Special workshop at IDEON Science Park, Lund, Sweden, 2007.Google Scholar
4 FILAMOS, s.r.o., www.filamos.cz Google Scholar

Full text views

Full text views reflects PDF downloads, PDFs sent to Google Drive, Dropbox and Kindle and HTML full text views.

Total number of HTML views: 0
Total number of PDF views: 7 *
View data table for this chart

* Views captured on Cambridge Core between September 2016 - 24th February 2021. This data will be updated every 24 hours.

Send article to Kindle

To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

The Development of Sprayed Backfill Technology
Available formats
×

Send article to Dropbox

To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

The Development of Sprayed Backfill Technology
Available formats
×

Send article to Google Drive

To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

The Development of Sprayed Backfill Technology
Available formats
×
×

Reply to: Submit a response


Your details


Conflicting interests

Do you have any conflicting interests? *