| To determine the optimal dosage of C-C type curing agents in the hydraulic fill ultra-soft soil for both permeability and strength improvement, compression consolidation test and vacuum consolidation test were carried out. After the test, the mechanism of permeability and consolidation characteristics improvement was evaluated by the effective pore ratio and the pore anti-compressive performance. Test results show that the consolidation coefficient of the semi-solidification ultra-soft soil, similar with soft clay, is increased with increasing pressure while the permeability coefficient is decreased with increasing load. And the coefficients are increased with the increasing addition under the same load. After adding a small amount of curing agents, mercury injection test shows that the peak value of pore size distribution curve shifts to left evidently, interval of concentrated aperture is moved to small pore interval, and the effective pore ratio exists maximum with different additions. The porous structure with low compressibility, increasing compressive properties of pores, retaining high strength drainage path and improving permeability, is formed. The more the curing agent is added, the more obvious the phenomenon of soil skeleton is and the higher soil strength and anti-compression ability are. Particularly, the unconfined compressive strength of the sample with 10% addition is up to 360.1 kPa. It is far higher than that of the sample prepared by curing only. The study reveals that with the addition in 1%-10%, curing agents can improve the permeability primarily, and it is appropriate for vacuum preloading with flocculants treatment, and while >10%, curing action will be primary. |
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