Abstract
In-situ measurements were conducted at closed old roadways in Kushiro Coal Mine in Kushiro, Japan. Based on the results of the P-wave velocity and permeability obtained at the closed old roadways, the material comprising deformed rock mass, filler, plastically deformed clay and softened rocks, with which the closed old roadways are filled, is judged to have the same quality with that of weak rock mass. This nature could be brought by the stress of small magnitude which has loaded the closed old roadways. In-situ monitoring of stress induced in the longwall goaf revealed that the crushed rocks in goaf have been receiving stress of fair magnitude, which could bring their consolidation. This anticipation was confirmed by the observation of the closed old goaf abandoned about 52 years ago that the crushed rocks have been consolidated to such extent that the machining surface created by the drum shearer is smooth and self supported.A suggestion was proposed for reasonable design and construction of rock caverns which could maintain mechanical stability for a long time in such sedimentary rock masses as ones encountered in Kushiro Coal Mine.
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