Based on nonlinear relationship between permeability and void ratio of intact natural clay

four theoretical permeability models

i.e. model

model

model

and model

are introduced and discussed. The 1-D consolidation and permeability combined tests on eight undisturbed Xiaoshan clay samples are carried out by GDS advanced consolidation testing system. Void ratio and directly-measured permeability coefficient obtained from the test results are analyzed to summarize clay parameters of four permeability models. Experimental results show that the permeability of Xiaoshan clay decreases nonlinearly with consolidation pressure increasing; and the permeability coefficient varies from 8×10-8 to 8×10-9 . It is also shown that all the four nonlinear permeability models are suitable for describing the permeability of Xiaoshan clay.