Determination of consolidation behaviour of clay slurries
摘要
The main objective of this study was to determine the consolidation behaviour of clay slurries.A finegrained clay with high consistency limits（WL = 180%,wP= 120%） was investigated using conventional oedometer and bench-top centrifuge tests.Results indicated that the slurry had an apparent preconsolidation（due to initial conditions,electrochemical interactions,tortuous drainage,and thixotropic strength） from e = 5.7 to e = 5.5 followed by virgin compression.Likewise,the low hydraulic conductivity(10-10-10-12 m/s) was due to low porosity（small pore throats） and high tortuosity（long flow paths）.Unlike consolidation of soils,the cv and mv decreased with increasing σ’ but increased with increasing e and k.The data from the two tests correlated well in the range of σ’ = 10-65 kPa,e = 5.5-3.86,k= 1.7 × 10-10-5×10-11 m/s,Fc = 1-40 MN.New equations were developed to correlate the consolidation parameters（e,σ’,k） with Fc.The deviation of k beyond 40 MN（e = 4.65） was due to deviation from the initial straight line portion of the settlement curve in the centrifuge test.