夾炭層岩石の乾燥に関する実験的研究

抄録

As an investigation of the mechanism of water movement in rocks related with the problem of moisture pick-up byventilation air current, experiments of air drying of coal measure rocks were carried out and the characteristic curves ofdrying of the rocks were obtained.
The results are summarized as follows:
(1) When the initial water content is high, in other words, the porosity is large, the characteristic curves are similar tothose of such porous materials as small particles. Namely, in the first stage, the constant-rate period is observed and thenthe falling-rate period appears with decreasing water content, and this falling-rate period is mostly divided into the firstfalling-rate and the second falling-rate.
(2) When the initial water content is less than about 0.07, only the falling-rate period appears irrespective of kinds ofrocks. Then, the critical water content may be considered to be about 0.07 in the experimental condition.
(3) During the falling-rate period, the drying curves of sandstones are nearly linear, while those of shales are S-shapeconfigurations. This indicates that shales are more difficult to dry than sandstones, and the same conclusion is obtained fromcomparison of equilibrium water contents of these rocks.