Abstract
Tests using a borehole jack or a pressure plate on tunnel wall are unsuitable for layered or jointed rock masses. Such rock masses possess five deformability measures— E h E v ν hh ν hv G hv or an equivalent set—and the procedures mentioned, which were developed for measuring just two parameters, are not adaptable. Jack tests on in situ blocks that have been partly isolated by saw-cuts are more suitable, perhaps in conjunction with seismic methods.
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