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The understanding of time-dependent deformation of rock around underground excavations becomes more and more important with the increase in overburden stress, opening size, and temperature expected in deep underground facilities for various purposes. It is desirable to use in situ measurements instead of laboratory data, because of the difference in time-dependent deformation mechanisms observed in laboratory and in situ measurement. In this study, the deformation measurements from Waste Isolation Pilot Plant, which is a deep underground radioactive waste repository in rock salt and a salt mine, in which yield pillar mining design was adopted, were extensively analyzed. It was possible to determine that the transition time from the primary to the secondary creep stages was around 200–300 days. The influence of adjacent excavation on the deformation measurement could be clearly observed. It was also found that the measuring time interval was important to understand the time-dependent deformation mechanisms.
The understanding of time-dependent deformation of rock around underground excavations becomes more and more important with the increase in overburden stress, opening size, and temperature expected in deep underground facilities for various purposes. It is desirable to use in situ measurements instead of laboratory data, because of the difference in time-dependent deformation mechanisms observed in laboratory and in situ measurement. In this study, the deformation measurements from Waste Isolation Pilot Plant, which is a deep underground radioactive waste repository in rock salt and a salt mine, in which yield pillar mining design was adopted, were extensively analyzed. It was possible to determine that the transition time from the primary to the secondary creep stages was around 200–300 days. The influence of adjacent excavation on the deformation measurement could be clearly observed. It was also found that the measuring time interval was important to understand the time-dependent deformation mechanisms.
Analysis of time-dependent deformation measured at deep underground openings
Kwon, S. (author)
Geosystem Engineering ; 16 ; 296-304
2013-12-01
9 pages
Article (Journal)
Electronic Resource
English
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