Table 1.
Physico-chemical property of Ningming Bentonite.
Table 2.
Fully chemistry analysis of silicate.
Fig 1.
Grading curve of the Ningming Bentonite.
Fig 2.
Variation curves of sample expansion rate and time under different concentration solution conditions.
(a) , (b)
.
Fig 3.
Relationship between expansion rate and NaCl solution concentrations.
Fig 4.
SEM test results of soil under different NaCl solution concentrations
: (a) c = 0 mol/L, (b) c = 0.01 mol/L, (c) c = 0.1 mol/L, (d) c = 0.5 mol/L, (e) c = 1.0 mol/L, (f) c = 2.0 mol/L.
Fig 5.
Relationship curve between pore size and pore size distribution density.
Fig 6.
Interlayer spacing results at different saline concentrations.
Table 3.
The dielectric constant D of the solution.
Fig 7.
The relationship between the relative thickness of the double layer and the NaCl concentration.
Fig 8.
Structure diagram of diffusion electric double layer.
Fig 9.
Relationship curve between solution pH value and solution concentration.
Table 4.
Results of parameters a, b for curve fitting.
Fig 10.
Fitting of sample expansion rate-time curves under different concentrations of solutions.
Fig 11.
Curve fitting of parameter a.
Fig 12.
Curve fitting of parameter b.
Fig 13.
Simulation verification of expansion rate curves of different concentrations of solution.