Abstract
Experimental results of swell pressure under complete inundation show that the curve of pressure against log of time has a typical reversed S shape, similar to that of consolidation. No endeavour, however, has been made to explain this behaviour theoretically.The paper deals with the mathematical derivation of the swell pressure function and the definition of the parameters involved. Under certain simplified assumptions, it is shown that the dissipation of the suction during a swelling test is proportional to the development of the swell pressure and that the dissipation function is mathematically identical with that of the consolidation process. The solution of this function yielded a rather simple expression for the swell pressure, which agrees with values obtained when the clay is saturated and results in a fraction of the initial suction when the clay is partly saturated.
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