Abstract
When we treat the soft ground phenomena such as landslide and land-subsidence, it is always an important subject how the pore-water which is one of the constituent elements of the clay responds to external stresses.
In order to make clear the phenomena experimentally and more minutely, not depending on the existing hypothesis, the author examined it rheologically based on laboratory measurements with small pore-water pressure sensors which was inserted into the clay directly.
As the result, it became clear that the pore-water pressure itself consists of the recoverable elastic component and the nonrecoverable plastic component, and the response of the internal pressure to external stress changes with the variations of water content.
