Advances on Investigations into ChemoMechanical Coupling Effects on the Volume Change Behavior of Compacted GMZ01 Bentonite

Abstract:

Based on the existing results from literature, contributions on the chemomechanical coupling effects on the volume change behavior of compacted GMZ01 bentonite were reviewed and presented. Results show that the swelling pressure and swelling strain of the GMZ01 bentonite decrease with the increase of concentrations of salt solutions. For a given concentration of salt solutions cyclically infiltrated, the total vertical displacement of the GMZ01 bentonite specimen mainly happens in the first salinizationdesalinization cycle. The plastic compressibility parameter decreases as the concentration of NaCl solution increases, the vertical stress applied during the saturation process has negligible influence on the compressibility parameter; while the yield stress increases as the concentration of NaCl solution or the vertical stress applied on saturation increases. Clearly, investigations on cyclically salinizationdesalinization with multiple cations solutions, the mechanism of microstructure and the multifield coupling tests with consideration of chemical effect should be conducted in the future.

Key words:GMZ01 bentonite; chemomechanical coupling; swelling behavior; compressibility; salinizationdesalinization cycles