Disturbed and damaged zones around underground openings - effects induced by construction and thermal loading

Research output: Contribution to report/book/conference proceedingsIn-proceedings paperpeer-review

Authors

  • Peter Blümling
  • Jean-François Aranyossy
  • Lanru Jing
  • Xiang Ling Li
  • Paul Marschall
  • Tilmann Rothfuchs
  • Tim Vietor

Institutes & Expert groups

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Abstract

The excavation of underground openings will induce rock failure in their vicinity. The size of such an excavation disturbed or damaged zone and the impact on hydraulic properties is controlled by the local (secondary) stress state, the pore pressure development and the physical properties of the host rock. Besides the geometry of the opening itself and the excavation/support techniques used, a significant impact on the geometry and characteristics of the EDZ is caused by the heterogeneity and the potential anisotropy of the host rock. Laboratory testing and large-scale in-situ mine-by experiments provide an understanding of the time-dependent development and potential self-sealing processes of the EDZ for different host rocks. Numerical blind predictions and back-calculations (e.g. within the EC projects Modex-Rep, CLIPEX and NF-PRO) have increased the confidence in the understanding of the underlying processes. After emplacement of waste in a repository, the rock experiences thermal loading. Stress and pore pressure will change and may alter the EDZ. New EC projects (TIMODAZ, THERESA) have been initiated to extend the geoscientific data bases for an in-depth understanding of THM coupled processes and to provide advanced modelling capabilities for assessing the evolution of the EDZ before and after closure of the repository structures.

Details

Original languageEnglish
Title of host publicationConference proceedings. EURADWASTE'08
Place of PublicationLuxembourg, Luxembourg
Pages203-212
Publication statusPublished - Dec 2009
EventEURADWASTE 2008 - 7th European Commission Conference on the Management and Disposal of Radioactive Waste - European Commission, Luxembourg, Luxembourg
Duration: 20 Oct 200823 Oct 2008

Publication series

NameEUR series
Number24040

Conference

ConferenceEURADWASTE 2008 - 7th European Commission Conference on the Management and Disposal of Radioactive Waste
Country/TerritoryLuxembourg
CityLuxembourg
Period2008-10-202008-10-23

Keywords

  • EDZ, Excavation Damage Zone, rock failure, excavation/support techniques, laboratory testing, in situ experiments, self-sealing, thermal loading, repository

ID: 285592