Abstract
During the time period December 1990 to May 1991, cavern B at Roeda Sten Rock Laboratory (RSRL) was cooled down to temperatures below freezing point. The cooling system was designed to refrigerate the rock wall surface to -45 deg C. The duration of the cooling period was planned to be two months. But due to problems with the compressor, the cooling period ended up to be about 5 months. The minimum temperature achieved was about -40 deg C in the cavern and -37 deg C on the cavern wall. The general purpose of the test in cavern B was to gain understanding of the rock mass response to thermomechanical loading. The cavern was therefore instrumentated with a large number of temperature gauges, extensometers, joint meters, convergence meters and strain gauges. The instrumentation was designed to record both radial and tangential deformation. The results show that the rock mass response to thermomechanical loading is very complex. The maximum radial deformation, about 1 mm, occured between the rock wall and 4 m into the rock mass. The majority of the joint meters installed horizontally on the cavern wall registered tension. This may indicate that joints open up as a consequence of cooling.
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Dahlstroem, L O
[1]
- Chalmers Univ. of Technology, Gothenburg (Sweden). Dept. of Geotechnical Engineering
Citation Formats
Dahlstroem, L O.
Rock mechanical consequences of refrigeration of cavern B in Roeda Sten.
Sweden: N. p.,
1992.
Web.
Dahlstroem, L O.
Rock mechanical consequences of refrigeration of cavern B in Roeda Sten.
Sweden.
Dahlstroem, L O.
1992.
"Rock mechanical consequences of refrigeration of cavern B in Roeda Sten."
Sweden.
@misc{etde_10132655,
title = {Rock mechanical consequences of refrigeration of cavern B in Roeda Sten}
author = {Dahlstroem, L O}
abstractNote = {During the time period December 1990 to May 1991, cavern B at Roeda Sten Rock Laboratory (RSRL) was cooled down to temperatures below freezing point. The cooling system was designed to refrigerate the rock wall surface to -45 deg C. The duration of the cooling period was planned to be two months. But due to problems with the compressor, the cooling period ended up to be about 5 months. The minimum temperature achieved was about -40 deg C in the cavern and -37 deg C on the cavern wall. The general purpose of the test in cavern B was to gain understanding of the rock mass response to thermomechanical loading. The cavern was therefore instrumentated with a large number of temperature gauges, extensometers, joint meters, convergence meters and strain gauges. The instrumentation was designed to record both radial and tangential deformation. The results show that the rock mass response to thermomechanical loading is very complex. The maximum radial deformation, about 1 mm, occured between the rock wall and 4 m into the rock mass. The majority of the joint meters installed horizontally on the cavern wall registered tension. This may indicate that joints open up as a consequence of cooling. The magnitude of the aperture increase is depending on the magnitude of the compressive stresses. (31 figs., 3 appendices).}
place = {Sweden}
year = {1992}
month = {Dec}
}
title = {Rock mechanical consequences of refrigeration of cavern B in Roeda Sten}
author = {Dahlstroem, L O}
abstractNote = {During the time period December 1990 to May 1991, cavern B at Roeda Sten Rock Laboratory (RSRL) was cooled down to temperatures below freezing point. The cooling system was designed to refrigerate the rock wall surface to -45 deg C. The duration of the cooling period was planned to be two months. But due to problems with the compressor, the cooling period ended up to be about 5 months. The minimum temperature achieved was about -40 deg C in the cavern and -37 deg C on the cavern wall. The general purpose of the test in cavern B was to gain understanding of the rock mass response to thermomechanical loading. The cavern was therefore instrumentated with a large number of temperature gauges, extensometers, joint meters, convergence meters and strain gauges. The instrumentation was designed to record both radial and tangential deformation. The results show that the rock mass response to thermomechanical loading is very complex. The maximum radial deformation, about 1 mm, occured between the rock wall and 4 m into the rock mass. The majority of the joint meters installed horizontally on the cavern wall registered tension. This may indicate that joints open up as a consequence of cooling. The magnitude of the aperture increase is depending on the magnitude of the compressive stresses. (31 figs., 3 appendices).}
place = {Sweden}
year = {1992}
month = {Dec}
}