Abstract
This report deals with the results of swelling test using the mudstone samples controled to various water potential states, as well as the relation between the dry shrinking of mudstone and the water potential. Moreover, it deals with the simple prediction method of the swelling behavior of mudstone.The important matters clarified by tests are as follows:1) Water at pF 4.20-5.50in its potential state accounts for the large amount of water contained in mudstone, and the remarkable shrinking is produced by the dehydration of this water.2) The amount of swelling recovers almost the amount of shrinking so far as the test sample is not slaked by wetting. In this case, water at the higher pF gives the better swelling efficiency per unit water volume.3) The occurrences of slaking increase in the drying condition above pF5.50 of test sample before wetting.4) The minute cracks occurred in the drying process produce a considerable effect on shrinking and swelling behavior of mudstone.5) It is possible to predict the amount of swelling and the swelling behavior of mudstone by shrinkage ratio at furnace drying.
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